Wishbone write seems to go wrong

Eric · August 18, 2022, 6:58am

Hi,

I’m trying to get a Wishbone test bench setup working.
I’m using a DUT like is shown on page 104 of this wishbone spec. See

The only difference is that I have a data path to 32 bits, and added an addr bus to it, although not used.

when I do wishbone write I get an error message.
That error message occurs at the same sim time as all the execution is done.
I don’t know what is causing this, as I assume the DUT in the specification is right.
It can be my DUT, it also can be the VVC as it is in BETA

In my TB I have

...
wishbone_write (WISHBONE_VVCT, C_ID_WB_MASTER, v_addr, v_data, "a wishbone write");
await_completion ((WISHBONE_VVCT, C_ID_WB_MASTER, 5 * CLK_PERIOD);
...

In the QuestaSim simulation I get:

UVVM:	LOG_HDR 10000.0 ns 		TB seq. 			v_addr is 0xA5
UVVM:	LOG_HDR 10000.0 ns 		TB seq. 			v_data is 0xCAFEBABE
UVVM:	LOG_HDR 10000.0 ns 		WISHBONE_VVC, 10  	..Interpreter: Waiting for command 
UVVM:	LOG_HDR 10000.0 ns 		TB seq.(uvvm)		->wishbone_write ((WISHBONE_VVCT, 10,x"A5", x"CAFEBABE"): 'a wishbone write cycle'. [4]
UVVM:	LOG_HDR 10000.0 ns 		WISHBONE_VVC, 10  	wishbone_write ((WISHBONE_VVCT, 10,x"A5", x"CAFEBABE"). Command received [4]
UVVM:	LOG_HDR 10000.0 ns 		WISHBONE_VVC, 10  	wishbone_write ((WISHBONE_VVCT, 10,x"A5", x"CAFEBABE") - Will be executed [4]  	
UVVM:	LOG_HDR 10000.0 ns 		WISHBONE_VVC, 10  	..Interpreter: Waiting for command 
UVVM:
UVVM: ========================================================================================================================================
UVVM: *** TB_FAILURE #1 ***
UVVM:           10000 ns WISHBONE_VVC,10
UVVM:                    wishbone_write => Failed. Boolean was false. 'Sanity check: Check that the setup_time is more than 0 ns.'

Because I do a await_completion of more then 0 ns I think I do it write.

Eric · August 18, 2022, 11:02am

It is apparently related to the first procedure lines of wishbone_write in the wishbone_bfm_pkg:

procedure wishbone_write (
...
...
begin
    -- setup_time and hold_time checking
    check_value(config.setup_time < config.clock_period/2, TB_FAILURE, "Sanity check: Check that setup_time do not exceed clock_period/2.", scope, ID_NEVER, msg_id_panel, proc_name);
    check_value(config.hold_time < config.clock_period/2, TB_FAILURE, "Sanity check: Check that hold_time do not exceed clock_period/2.", scope, ID_NEVER, msg_id_panel, proc_name);
    check_value(config.setup_time > 0 ns, TB_FAILURE, "Sanity check: Check that setup_time is more than 0 ns.", scope, ID_NEVER, msg_id_panel, proc_name);
    check_value(config.hold_time > 0 ns, TB_FAILURE, "Sanity check: Check that hold_time is more than 0 ns.", scope, ID_NEVER, msg_id_panel, proc_name);

This suggest that I first need to do something else.
What is that?

Rgds,
Eric

Eric · August 18, 2022, 11:37am

Apparently I need to change the C_WISHBONE_BFM_CONFIG_DEFAULT in the wishbone_bfm_pkg.vhd

By changing
line 68
clock_period => 10 ns, (was -1 ns)

line 71
setup_time => 2ns, (was -1 ns)

line 72
hold_time => 2 ns, (was -1 ns)

Simulation now completes.
Why are these values on -1ns ?

Marius · August 19, 2022, 7:31am

Hi Eric,
These values are set to -1 ns (i.e. an invalid value) so that the test designer is required to set them. Should you fail to set these values - and there were some valid, but incorrect, default values - you could run into problems with you testbench or even your testbench and DUT.

Br.
Marius

Eric · August 19, 2022, 7:48am

I now got it working a bit further, I can do two writes, which goes back to back
When I add some clocks to it then I get an error

wisbone_write (...)
await_completion (...)
wisbone_write (...)
await_completion (...)

Wait some clock periods
wisbone_write (...)
await_completion (...)

I now get the error:
await_value(std_logic, 0, 0 ns, 5ns) => Failed. Timed out after 5 ns. 'wishbone_write: timeout waiting for clk low_period for setup_time.'

How can I fix this?
I’m still using the values mentioned earlier in this thread (setup 2ns, hold 2ns, clock 10 ns)

Eric · August 23, 2022, 11:22am

Hi Marius,

Any idea on how to fix this? I’m running in circles at the moment.

Rgds.
Eric

Marius · August 24, 2022, 6:32pm

Hi Eric,
It’s not clear to me why you get this timeout, but maybe you could share the transcript? Run with all log messages enabled.
Why do yo have all those await_completion() between the calls? Are you addressing different instances of the VVC? The commands are put inside a queue so if your goal is to have, say 3 wishbone_write() before you want to do something else, just issue 3 wishbone_write() VVC commands and then call the await_completion(). See the uvvm_vvc_framework/doc/Common_VVC_Methods.pdf page 4 for details.

Br.
Marius

Eric · August 25, 2022, 6:02am

About the await_completion. I thought this was required. Apparently I miss understood.

Transcript of simulation:

# vsim -suppress 1083 work.tb_wb_slave_gpo 
# Start time: 07:58:38 on Aug 25,2022
# ** Note: (vsim-3812) Design is being optimized...
# //  Questa Sim-64
# //  Version 2021.1 win64 Jan 19 2021
# //
# //  Copyright 1991-2021 Mentor Graphics Corporation
# //  All Rights Reserved.
# //
# //  QuestaSim and its associated documentation contain trade
# //  secrets and commercial or financial information that are the property of
# //  Mentor Graphics Corporation and are privileged, confidential,
# //  and exempt from disclosure under the Freedom of Information Act,
# //  5 U.S.C. Section 552. Furthermore, this information
# //  is prohibited from disclosure under the Trade Secrets Act,
# //  18 U.S.C. Section 1905.
# //
# Loading std.standard
# Loading std.textio(body)
# Loading ieee.std_logic_1164(body)
# Loading ieee.numeric_std(body)
# Loading uvvm_util.types_pkg(body)
# Loading uvvm_util.adaptations_pkg(body)
# Loading ieee.math_real(body)
# Loading uvvm_util.string_methods_pkg(body)
# Loading uvvm_util.protected_types_pkg(body)
# Loading uvvm_util.global_signals_and_shared_variables_pkg
# Loading uvvm_util.hierarchy_linked_list_pkg(body)
# Loading uvvm_util.license_pkg(body)
# Loading std.env(body)
# Loading uvvm_util.alert_hierarchy_pkg(body)
# Loading uvvm_util.methods_pkg(body)
# ** Note: 
# 
# 
# *****************************************************************************************************
#  This is a *** LICENSED PRODUCT *** as given in the LICENSE.TXT in the root directory.
# *****************************************************************************************************
# 
# 
#    Time: 0 ns  Iteration: 0  Region: /methods_pkg File: ../../vendor_libs/uvvm/uvvm_util/script/../src/methods_pkg.vhd
# ** Note: 
# 
# =====================================================================================================
# =====================================================================================================
# This info section may be turned off via C_SHOW_UVVM_UTILITY_LIBRARY_INFO in adaptations_pkg.vhd
# 
# Important Simulator setup: 
# - Set simulator to break on severity 'FAILURE' 
# - Set simulator transcript to a monospace font (e.g. Courier new)
# 
# UVVM Utility Library setup:
# - It is recommended to go through the two powerpoint presentations provided with the download
# - There is a Quick-Reference in the doc-directory
# - In order to change layout or behaviour - please check the src*/adaptations_pkg.vhd
#   This is intended for personal or company customization
# 
# License conditions are given in LICENSE.TXT
# =====================================================================================================
# =====================================================================================================
# 
# 
#    Time: 0 ns  Iteration: 0  Region: /methods_pkg File: ../../vendor_libs/uvvm/uvvm_util/script/../src/methods_pkg.vhd
# Loading uvvm_util.bfm_common_pkg(body)
# Loading uvvm_util.generic_queue_pkg(body)
# Loading uvvm_util.rand_pkg(body)
# Loading uvvm_util.func_cov_pkg(body)
# Loading uvvm_vvc_framework.ti_protected_types_pkg(body)
# Loading uvvm_vvc_framework.ti_vvc_framework_support_pkg(body)
# Loading bitvis_vip_scoreboard.generic_sb_support_pkg(body)
# Loading bitvis_vip_wishbone.wishbone_bfm_pkg(body)
# Loading bitvis_vip_wishbone.vvc_cmd_pkg(body)
# Loading bitvis_vip_wishbone.td_target_support_pkg(body)
# Loading bitvis_vip_scoreboard.generic_sb_pkg(body)
# Loading bitvis_vip_wishbone.vvc_methods_pkg(body)
# Loading bitvis_vip_wishbone.td_vvc_framework_common_methods_pkg(body)
# Loading bitvis_vip_clock_generator.vvc_cmd_pkg(body)
# Loading bitvis_vip_clock_generator.td_target_support_pkg(body)
# Loading bitvis_vip_clock_generator.vvc_methods_pkg(body)
# Loading bitvis_vip_clock_generator.td_vvc_framework_common_methods_pkg(body)
# Loading bitvis_vip_spi.spi_bfm_pkg(body)
# Loading bitvis_vip_spi.transaction_pkg
# Loading bitvis_vip_spi.vvc_cmd_pkg(body)
# Loading bitvis_vip_spi.td_target_support_pkg(body)
# Loading bitvis_vip_spi.td_vvc_framework_common_methods_pkg(body)
# Loading bitvis_vip_spi.vvc_methods_pkg(body)
# Loading bitvis_vip_gpio.gpio_bfm_pkg(body)
# Loading bitvis_vip_gpio.transaction_pkg
# Loading bitvis_vip_gpio.vvc_cmd_pkg(body)
# Loading bitvis_vip_gpio.td_target_support_pkg(body)
# Loading bitvis_vip_gpio.vvc_methods_pkg(body)
# Loading bitvis_vip_gpio.td_vvc_framework_common_methods_pkg(body)
# Loading lib_cpld.cpld_constants_pkg(body)
# Loading lib_verification.verification_pkg(body)
# Loading work.tb_wb_slave_gpo(rtl)#1
# Loading bitvis_vip_clock_generator.td_cmd_queue_pkg
# Loading bitvis_vip_clock_generator.td_result_queue_pkg
# Loading bitvis_vip_clock_generator.td_vvc_entity_support_pkg(body)
# Loading bitvis_vip_wishbone.td_cmd_queue_pkg
# Loading bitvis_vip_wishbone.td_result_queue_pkg
# Loading bitvis_vip_wishbone.td_vvc_entity_support_pkg(body)
# Loading bitvis_vip_gpio.td_cmd_queue_pkg
# Loading bitvis_vip_gpio.td_result_queue_pkg
# Loading bitvis_vip_gpio.td_vvc_entity_support_pkg(body)
# Loading work.th_wb_slave_gpo(struct)#1
# Loading bitvis_vip_clock_generator.clock_generator_vvc(behave)#1
# UVVM: ID_CONSTRUCTOR                     0.0 ns  GPIO_VVC,31                    VVC instantiated.
# UVVM: ID_CONSTRUCTOR_SUB                 0.0 ns  GPIO_VVC,31                    Command queue instantiated and will give a warning when reaching 1000 elements in queue.
# UVVM: ID_CONSTRUCTOR_SUB                 0.0 ns  GPIO_VVC,31                    Result queue instantiated and will give a warning when reaching 1000 elements in queue.
# UVVM: ID_CONSTRUCTOR                     0.0 ns  WISHBONE_VVC,14                VVC instantiated.
# UVVM: ID_CONSTRUCTOR_SUB                 0.0 ns  WISHBONE_VVC,14                Command queue instantiated and will give a warning when reaching 1000 elements in queue.
# UVVM: ID_CONSTRUCTOR_SUB                 0.0 ns  WISHBONE_VVC,14                Result queue instantiated and will give a warning when reaching 1000 elements in queue.
# UVVM: ID_CONSTRUCTOR                     0.0 ns  CLOCK_GENERATOR_VVC,0          VVC instantiated.
# UVVM: ID_CONSTRUCTOR_SUB                 0.0 ns  CLOCK_GENERATOR_VVC,0          Command queue instantiated and will give a warning when reaching 1000 elements in queue.
# UVVM: ID_CONSTRUCTOR_SUB                 0.0 ns  CLOCK_GENERATOR_VVC,0          Result queue instantiated and will give a warning when reaching 1000 elements in queue.
# UVVM: ID_CMD_INTERPRETER_WAIT            0.0 ns  GPIO_VVC,31                      ..Interpreter: Waiting for command
# UVVM: ID_CMD_INTERPRETER_WAIT            0.0 ns  WISHBONE_VVC,14                  ..Interpreter: Waiting for command
# UVVM: ID_CMD_INTERPRETER_WAIT            0.0 ns  CLOCK_GENERATOR_VVC,0            ..Interpreter: Waiting for command
# UVVM: ID_CTRL                            0.0 ns  GPIO_VVC_SB,31                 enable() => SB enabled. 'GPIO VVC SB Enabled'
# UVVM: ID_CTRL                            0.0 ns  GPIO_VVC_SB,31                 config() => config applied to SB. 
# UVVM: ID_CTRL                            0.0 ns  GPIO_VVC_SB,31                 enable_log_msg() => message id id_data enabled.
# UVVM: ID_CTRL                            0.0 ns  WISHBONE_VVC_SB,14             enable() => SB enabled. 'WISHBONE VVC SB Enabled'
# UVVM: ID_CTRL                            0.0 ns  WISHBONE_VVC_SB,14             config() => config applied to SB. 
# UVVM: ID_CTRL                            0.0 ns  WISHBONE_VVC_SB,14             enable_log_msg() => message id id_data enabled.
# UVVM: ID_CMD_EXECUTOR_WAIT               0.0 ns  CLOCK_GENERATOR_VVC,0            ..Executor: Waiting for command
# UVVM:      
# UVVM:      --------------------------------------------------------------------------------------------------------------------------------------------------------------------
# UVVM:      ***  REPORT OF GLOBAL CTRL ***
# UVVM:      --------------------------------------------------------------------------------------------------------------------------------------------------------------------
# UVVM:                                IGNORE    STOP_LIMIT
# UVVM:                NOTE         :  REGARD         0
# UVVM:                TB_NOTE      :  REGARD         0
# UVVM:                WARNING      :  REGARD         0
# UVVM:                TB_WARNING   :  REGARD         0
# UVVM:                MANUAL_CHECK :  REGARD         0
# UVVM:                ERROR        :  REGARD         1
# UVVM:                TB_ERROR     :  REGARD         1
# UVVM:                FAILURE      :  REGARD         1
# UVVM:                TB_FAILURE   :  REGARD         1
# UVVM:      --------------------------------------------------------------------------------------------------------------------------------------------------------------------
# UVVM:      
# UVVM:      
# UVVM:      --------------------------------------------------------------------------------------------------------------------------------------------------------------------
# UVVM:      ***  REPORT OF MSG ID PANEL ***
# UVVM:      --------------------------------------------------------------------------------------------------------------------------------------------------------------------
# UVVM:                ID                             Status
# UVVM:                ------------------------       ------
# UVVM:                ID_UTIL_BURIED               : DISABLED
# UVVM:                ID_BITVIS_DEBUG              : DISABLED
# UVVM:                ID_UTIL_SETUP                : ENABLED
# UVVM:                ID_LOG_MSG_CTRL              : ENABLED
# UVVM:                ID_ALERT_CTRL                : ENABLED
# UVVM:                ID_FINISH_OR_STOP            : ENABLED
# UVVM:                ID_CLOCK_GEN                 : ENABLED
# UVVM:                ID_GEN_PULSE                 : ENABLED
# UVVM:                ID_BLOCKING                  : ENABLED
# UVVM:                ID_WATCHDOG                  : ENABLED
# UVVM:                ID_RAND_GEN                  : DISABLED
# UVVM:                ID_RAND_CONF                 : DISABLED
# UVVM:                ID_FUNC_COV_BINS             : DISABLED
# UVVM:                ID_FUNC_COV_BINS_INFO        : DISABLED
# UVVM:                ID_FUNC_COV_RAND             : DISABLED
# UVVM:                ID_FUNC_COV_SAMPLE           : DISABLED
# UVVM:                ID_FUNC_COV_CONFIG           : DISABLED
# UVVM:                ID_POS_ACK                   : ENABLED
# UVVM:                ID_LOG_HDR                   : ENABLED
# UVVM:                ID_LOG_HDR_LARGE             : ENABLED
# UVVM:                ID_LOG_HDR_XL                : ENABLED
# UVVM:                ID_SEQUENCER                 : ENABLED
# UVVM:                ID_SEQUENCER_SUB             : ENABLED
# UVVM:                ID_BFM                       : ENABLED
# UVVM:                ID_BFM_WAIT                  : ENABLED
# UVVM:                ID_BFM_POLL                  : ENABLED
# UVVM:                ID_BFM_POLL_SUMMARY          : ENABLED
# UVVM:                ID_CHANNEL_BFM               : ENABLED
# UVVM:                ID_TERMINATE_CMD             : ENABLED
# UVVM:                ID_SEGMENT_INITIATE          : ENABLED
# UVVM:                ID_SEGMENT_COMPLETE          : ENABLED
# UVVM:                ID_SEGMENT_HDR               : ENABLED
# UVVM:                ID_SEGMENT_DATA              : ENABLED
# UVVM:                ID_PACKET_INITIATE           : ENABLED
# UVVM:                ID_PACKET_PREAMBLE           : ENABLED
# UVVM:                ID_PACKET_COMPLETE           : ENABLED
# UVVM:                ID_PACKET_HDR                : ENABLED
# UVVM:                ID_PACKET_DATA               : ENABLED
# UVVM:                ID_PACKET_CHECKSUM           : ENABLED
# UVVM:                ID_PACKET_GAP                : ENABLED
# UVVM:                ID_PACKET_PAYLOAD            : ENABLED
# UVVM:                ID_FRAME_INITIATE            : ENABLED
# UVVM:                ID_FRAME_COMPLETE            : ENABLED
# UVVM:                ID_FRAME_HDR                 : ENABLED
# UVVM:                ID_FRAME_DATA                : ENABLED
# UVVM:                ID_COVERAGE_MAKEBIN          : DISABLED
# UVVM:                ID_COVERAGE_ADDBIN           : DISABLED
# UVVM:                ID_COVERAGE_ICOVER           : DISABLED
# UVVM:                ID_COVERAGE_CONFIG           : ENABLED
# UVVM:                ID_COVERAGE_SUMMARY          : ENABLED
# UVVM:                ID_COVERAGE_HOLES            : ENABLED
# UVVM:                ID_UVVM_SEND_CMD             : ENABLED
# UVVM:                ID_UVVM_CMD_ACK              : ENABLED
# UVVM:                ID_UVVM_CMD_RESULT           : ENABLED
# UVVM:                ID_CMD_INTERPRETER           : ENABLED
# UVVM:                ID_CMD_INTERPRETER_WAIT      : ENABLED
# UVVM:                ID_IMMEDIATE_CMD             : ENABLED
# UVVM:                ID_IMMEDIATE_CMD_WAIT        : ENABLED
# UVVM:                ID_CMD_EXECUTOR              : ENABLED
# UVVM:                ID_CMD_EXECUTOR_WAIT         : ENABLED
# UVVM:                ID_CHANNEL_EXECUTOR          : ENABLED
# UVVM:                ID_CHANNEL_EXECUTOR_WAIT     : ENABLED
# UVVM:                ID_NEW_HVVC_CMD_SEQ          : ENABLED
# UVVM:                ID_INSERTED_DELAY            : ENABLED
# UVVM:                ID_OLD_AWAIT_COMPLETION      : ENABLED
# UVVM:                ID_AWAIT_COMPLETION          : ENABLED
# UVVM:                ID_AWAIT_COMPLETION_LIST     : ENABLED
# UVVM:                ID_AWAIT_COMPLETION_WAIT     : ENABLED
# UVVM:                ID_AWAIT_COMPLETION_END      : ENABLED
# UVVM:                ID_UVVM_DATA_QUEUE           : ENABLED
# UVVM:                ID_CONSTRUCTOR               : ENABLED
# UVVM:                ID_CONSTRUCTOR_SUB           : ENABLED
# UVVM:                ID_VVC_ACTIVITY              : ENABLED
# UVVM:                ID_MONITOR                   : ENABLED
# UVVM:                ID_MONITOR_ERROR             : ENABLED
# UVVM:                ID_DATA                      : ENABLED
# UVVM:                ID_CTRL                      : ENABLED
# UVVM:                ID_FILE_OPEN_CLOSE           : ENABLED
# UVVM:                ID_FILE_PARSER               : ENABLED
# UVVM:                ID_SPEC_COV                  : ENABLED
# UVVM:      --------------------------------------------------------------------------------------------------------------------------------------------------------------------
# UVVM:      
# UVVM: ID_LOG_MSG_CTRL                    0.0 ns  TB seq.                        enable_log_msg(ALL_MESSAGES). 
# UVVM: ID_LOG_MSG_CTRL                    0.0 ns  TB seq.                        enable_log_msg(ID_LOG_HDR). 
# UVVM: ID_LOG_MSG_CTRL                    0.0 ns  TB seq.                        enable_log_msg(ID_SEQUENCER). 
# UVVM: ID_LOG_MSG_CTRL                    0.0 ns  TB seq.                        enable_log_msg(ID_UVVM_SEND_CMD). 
# UVVM: ID_UVVM_SEND_CMD                   0.0 ns  TB seq.(uvvm)                  ->start_clock(CLOCK_GENERATOR_VVC,0): 'Start CNV clock generator'. [1]
# UVVM: ID_CMD_EXECUTOR_WAIT               0.0 ns  GPIO_VVC,31                      ..Executor: Waiting for command
# UVVM: ID_CMD_EXECUTOR_WAIT               0.0 ns  WISHBONE_VVC,14                  ..Executor: Waiting for command
# UVVM: ID_CMD_INTERPRETER                 0.0 ns  CLOCK_GENERATOR_VVC,0            start_clock(CLOCK_GENERATOR_VVC,0). Command received  [1]
# UVVM: ID_CMD_EXECUTOR                    0.0 ns  CLOCK_GENERATOR_VVC,0            start_clock(CLOCK_GENERATOR_VVC,0) - Will be executed  [1]
# UVVM: ID_UVVM_CMD_ACK                    0.0 ns  TB seq.(uvvm)                      ACK received.   [1]
# UVVM: ID_CLOCK_GEN                       0.0 ns  CLOCK_GENERATOR_VVC,0          Clock 'CNV_CLOCK' started
# UVVM: ID_CMD_INTERPRETER_WAIT            0.0 ns  CLOCK_GENERATOR_VVC,0            ..Interpreter: Waiting for command
# UVVM: ID_CMD_EXECUTOR_WAIT               0.0 ns  CLOCK_GENERATOR_VVC,0            ..Executor: Waiting for command
# UVVM: 
# UVVM: 
# UVVM: ID_LOG_HDR                     10000.0 ns  TB seq.                        Configure WB VVC 
# UVVM: -------------------------------------------------------------------------------------------------------------------------------------------------------------------------
# UVVM: ID_UVVM_SEND_CMD               10000.0 ns  TB seq.(uvvm)                  ->enable_log_msg(WISHBONE_VVC,14, ID_BFM): . [2]
# UVVM: ID_CMD_INTERPRETER             10000.0 ns  WISHBONE_VVC,14                  enable_log_msg(WISHBONE_VVC,14, ID_BFM). Command received  [2]
# UVVM: ID_LOG_MSG_CTRL                10000.0 ns  WISHBONE_VVC,14                enable_log_msg(ID_BFM). ' [2]'
# UVVM: ID_UVVM_CMD_ACK                10000.0 ns  TB seq.(uvvm)                      ACK received.   [2]
# UVVM: ID_CMD_INTERPRETER_WAIT        10000.0 ns  WISHBONE_VVC,14                  ..Interpreter: Waiting for command
# UVVM: ID_UVVM_SEND_CMD               10000.0 ns  TB seq.(uvvm)                  ->enable_log_msg(WISHBONE_VVC,14, ID_FINISH_OR_STOP): . [3]
# UVVM: ID_CMD_INTERPRETER             10000.0 ns  WISHBONE_VVC,14                  enable_log_msg(WISHBONE_VVC,14, ID_FINISH_OR_STOP). Command received  [3]
# UVVM: ID_LOG_MSG_CTRL                10000.0 ns  WISHBONE_VVC,14                enable_log_msg(ID_FINISH_OR_STOP). ' [3]'
# UVVM: ID_UVVM_CMD_ACK                10000.0 ns  TB seq.(uvvm)                      ACK received.   [3]
# UVVM: 
# UVVM: 
# UVVM: ID_LOG_HDR                     10000.0 ns  TB seq.                        Starting simulation of TB for WB_SLAVE using VVCs
# UVVM: -------------------------------------------------------------------------------------------------------------------------------------------------------------------------
# UVVM: 
# UVVM: 
# UVVM: ID_LOG_HDR                     10000.0 ns  TB seq.                        WB write, read and check example
# UVVM: -------------------------------------------------------------------------------------------------------------------------------------------------------------------------
# UVVM: ID_CMD_INTERPRETER_WAIT        10000.0 ns  WISHBONE_VVC,14                  ..Interpreter: Waiting for command
# UVVM: ID_UVVM_SEND_CMD               10000.0 ns  TB seq.(uvvm)                  ->wishbone_write(WISHBONE_VVC,14, x"A5", x"CAFEBABE"): 'a wishbone write cycle'. [4]
# UVVM: ID_CMD_INTERPRETER             10000.0 ns  WISHBONE_VVC,14                  wishbone_write(WISHBONE_VVC,14, x"A5", x"CAFEBABE"). Command received  [4]
# UVVM: ID_CMD_EXECUTOR                10000.0 ns  WISHBONE_VVC,14                  wishbone_write(WISHBONE_VVC,14, x"A5", x"CAFEBABE") - Will be executed  [4]
# UVVM: ID_UVVM_CMD_ACK                10000.0 ns  TB seq.(uvvm)                      ACK received.   [4]
# UVVM: ID_CMD_INTERPRETER_WAIT        10000.0 ns  WISHBONE_VVC,14                  ..Interpreter: Waiting for command
# UVVM: ID_AWAIT_COMPLETION            10000.0 ns  TB seq.(uvvm)                  await_completion(WISHBONE_VVC,14, 20000 ns): . [5]
# UVVM: ID_AWAIT_COMPLETION_WAIT       10000.0 ns  TB seq.(uvvm)                  ..await_completion(WISHBONE_VVC,14, 20000 ns) - Pending completion.  [5]
# UVVM: ID_BFM                         11002.0 ns  WISHBONE_VVC,14                wishbone_write(A:x"A5", x"CAFEBABE") completed. 'a wishbone write cycle'  [4]
# UVVM: ID_AWAIT_COMPLETION_END        11002.0 ns  TB seq.(uvvm)                    await_completion(WISHBONE_VVC,14, 20000 ns)=> WISHBONE_VVC,14 finished.  [5]
# UVVM: ID_UVVM_SEND_CMD               11002.0 ns  TB seq.(uvvm)                  ->wishbone_write(WISHBONE_VVC,14, x"A5", x"FACEB00C"): 'a wishbone write cycle'. [6]
# UVVM: ID_CMD_EXECUTOR_WAIT           11002.0 ns  WISHBONE_VVC,14                  ..Executor: Waiting for command
# UVVM: ID_CMD_INTERPRETER             11002.0 ns  WISHBONE_VVC,14                  wishbone_write(WISHBONE_VVC,14, x"A5", x"FACEB00C"). Command received  [6]
# UVVM: ID_CMD_EXECUTOR                11002.0 ns  WISHBONE_VVC,14                  wishbone_write(WISHBONE_VVC,14, x"A5", x"FACEB00C") - Will be executed  [6]
# UVVM: ID_UVVM_CMD_ACK                11002.0 ns  TB seq.(uvvm)                      ACK received.   [6]
# UVVM: ID_CMD_INTERPRETER_WAIT        11002.0 ns  WISHBONE_VVC,14                  ..Interpreter: Waiting for command
# UVVM: ID_AWAIT_COMPLETION            11002.0 ns  TB seq.(uvvm)                  await_completion(WISHBONE_VVC,14, 20000 ns): . [7]
# UVVM: ID_AWAIT_COMPLETION_WAIT       11002.0 ns  TB seq.(uvvm)                  ..await_completion(WISHBONE_VVC,14, 20000 ns) - Pending completion.  [7]
# UVVM: ID_BFM                         12002.0 ns  WISHBONE_VVC,14                wishbone_write(A:x"A5", x"FACEB00C") completed. 'a wishbone write cycle'  [6]
# UVVM: ID_AWAIT_COMPLETION_END        12002.0 ns  TB seq.(uvvm)                    await_completion(WISHBONE_VVC,14, 20000 ns)=> WISHBONE_VVC,14 finished.  [7]
# UVVM: ID_CMD_EXECUTOR_WAIT           12002.0 ns  WISHBONE_VVC,14                  ..Executor: Waiting for command
# UVVM: ID_UVVM_SEND_CMD               15012.0 ns  TB seq.(uvvm)                  ->wishbone_write(WISHBONE_VVC,14, x"A5", x"FACEB00C"): 'a wishbone write cycle'. [8]
# UVVM: ID_CMD_INTERPRETER             15012.0 ns  WISHBONE_VVC,14                  wishbone_write(WISHBONE_VVC,14, x"A5", x"FACEB00C"). Command received  [8]
# UVVM: ID_CMD_EXECUTOR                15012.0 ns  WISHBONE_VVC,14                  wishbone_write(WISHBONE_VVC,14, x"A5", x"FACEB00C") - Will be executed  [8]
# UVVM: ID_UVVM_CMD_ACK                15012.0 ns  TB seq.(uvvm)                      ACK received.   [8]
# UVVM: ID_CMD_INTERPRETER_WAIT        15012.0 ns  WISHBONE_VVC,14                  ..Interpreter: Waiting for command
# UVVM: ID_AWAIT_COMPLETION            15012.0 ns  TB seq.(uvvm)                  await_completion(WISHBONE_VVC,14, 20000 ns): . [9]
# UVVM: ID_AWAIT_COMPLETION_WAIT       15012.0 ns  TB seq.(uvvm)                  ..await_completion(WISHBONE_VVC,14, 20000 ns) - Pending completion.  [9]
# UVVM: 
# UVVM: =========================================================================================================================================================================
# UVVM: ***  TB_FAILURE #1  ***
# UVVM:         15017 ns   TB seq.
# UVVM:                    await_value(std_logic 0, 0 ns, 5 ns) => Failed. Timed out after 5 ns. 'wishbone_write: timeout waiting for clk low period for setup_time.'
# UVVM: 
# UVVM: Simulator has been paused as requested after 1 TB_FAILURE
# UVVM: *** To find the root cause of this alert, step out the HDL calling stack in your simulator. ***
# UVVM: *** For example, step out until you reach the call from the test sequencer. ***
# UVVM: =========================================================================================================================================================================
# UVVM: 
# UVVM: 
# ** Note: stop
#    Time: 15017 ns  Iteration: 0  Instance: /tb_wb_slave_gpo/i_test_harness/i_wb_master_vvc
# Break in Subprogram alert at ../../vendor_libs/uvvm/uvvm_util/script/../src/methods_pkg.vhd line 3702
# End time: 07:58:45 on Aug 25,2022, Elapsed time: 0:00:07
# Errors: 0, Warnings: 0, Suppressed Warnings: 4
[sim_all.bat] An error occured!
[sim_all.bat] ----- END -----

Marius · August 25, 2022, 6:33am

Hi,
The BFM is complaining that your clock is not running (or it’s running to slow). Is your clock generator running and is its clock period matching the wishbone configured clock period, setup and hold times?

Br,
Marius

Eric · October 3, 2022, 8:43am

Hi Marius,

I finally have the time to get back on this.
Your right, the clock seems to be too slow.
I get the test bench working when I use a clock period in the range of 6 ns - 33 ns.
Bigger or lower will produce an error.

Wishbone is a new interface to me, and I was not aware that there was a clock constrain of a min /max period value on Wishbone.

So your reply fix my issue.

Rgds,
Eric

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