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# $Id: w11a_tb_guide.txt 428 2011-11-20 12:19:31Z mueller $
Guide to running w11a test benches
Table of content:
1. Unit tests benches
2. Available unit tests benches
3. System tests benches
4. Available system tests benches
1. Unit tests benches -----------------------------------------------------
All unit test benches have the same simple structure:
- a stimulus process reads test patterns as well as the expected
responses from a stimulus file
- the responses are checked in very simple cases by the stimulus process,
in general by a monitoring process
- the test bench produces a comprehensive log file. For each checked
response the line contains the word "CHECK" and either an "OK" or a
"FAIL", in the later case in general with an indication of whats wrong.
Other unexpected behaviour, like timeouts, will also result in a line
containing the word "FAIL".
- at the end a line with the word "DONE" is printed.
- the test bench is run like
tbw <testbenchname> [stimfile] | tee <logfile> | egrep "(FAIL|DONE)"
where
- 'tbw' is a small perl script setting up a symbolic link to the
stimulus file, the default extracted from the file tbw.dat, if
an optional file name is give this one will be used instead.
- 'tee' ensured that the full log is saved
- 'egrep' filters FAIL and DONE lines, a successful run will
produce a single DONE line
- Most tests can be run against
- the functional model
- gate level models at three stages
- the post-xst model (produced by netgen from ngc xst output)
- the post-map model (produced by netgen from ncd ngdbuild output)
- the post-par model (produced by netgen from ncd par output)
This is simply done using
make <testbench>_ssim for post-xst
make <testbench>_fsim for post-map
make <testbench>_tsim for post-par
all the rest is handled by the build environment.
An example of a post-synthesis model is given for the w11a core test.
2. Available unit tests benches -------------------------------------------
In the following the available tests are listed with
- the 'make' command to build them
- the pipe setup to run them
- the expected output (the run time measured on a 3 GHz system)
- serport receiver test
cd $RETROBASE/rtl/vlib/serport/tb
make tb_serport_uart_rx
time tbw tb_serport_uart_rx |\
tee tb_serport_uart_rx_dsim.log | egrep "(FAIL|DONE)"
-> 1269955.0 ns 63488: DONE
-> real 0m01.178s user 0m01.172s sys 0m00.020s
- serport receiver/transmitter test
make tb_serport_uart_rxtx
time tbw tb_serport_uart_rxtx |\
tee tb_serport_uart_rxtx_dsim.log | egrep "(FAIL|DONE)"
-> 52335.0 ns 2607: DONE
-> real 0m00.094s user 0m00.092s sys 0m00.008s
- serport autobauder test
make tb_serport_autobaud
time tbw tb_serport_autobaud |\
tee tb_serport_autobaud_dsim.log | egrep "(FAIL|DONE)"
-> 367475.0 ns 18364: DONE
-> real 0m00.610s user 0m00.612s sys 0m00.004s
- rlink core test
cd $RETROBASE/rtl/vlib/rlink/tb
make tb_rlink_direct
time tbw tb_rlink_direct |\
tee tb_rlink_direct_dsim.log | egrep "(FAIL|DONE)"
-> 142355.0 ns 7108: DONE
-> real 0m00.317s user 0m00.324s sys 0m00.028s
- rlink core test via serial port interface
make tb_rlink_serport
time tbw tb_rlink_serport tb_rlink_serport_stim.dat |\
tee tb_rlink_serport_stim2_dsim.log | egrep "(FAIL|DONE)"
-> 72735.0 ns 3627: DONE
-> real 0m00.266s user 0m00.264s sys 0m00.008s
time tbw tb_rlink_serport tb_rlink_stim.dat |\
tee tb_rlink_serport_dsim.log | egrep "(FAIL|DONE)"
-> 536155.0 ns 26798: DONE
-> real 0m01.714s user 0m01.704s sys 0m00.044s
- w11a core test (using behavioural model)
cd $RETROBASE/rtl/w11a/tb
make tb_pdp11core
time tbw tb_pdp11core |\
tee tb_pdp11core_dsim.log | egrep "(FAIL|DONE)"
-> 1220255.0 ns 61003: DONE
-> real 0m10.736s user 0m10.713s sys 0m00.060s
- w11a core test (using post-synthesis model)
make ghdl_tmp_clean tb_pdp11core_ssim
time tbw tb_pdp11core_ssim |\
tee tb_pdp11core_ssim.log | egrep "(FAIL|DONE)"
-> 1220255.0 ns 61003: DONE
-> real 1m09.738s user 1m09.588s sys 0m00.096s
3. System tests benches ---------------------------------------------------
The system tests allow to verify to verify a full system design.
In this case vhdl test bench code contains
- (simple) models of the memories used on the FPGA boards
- drivers for the rlink connection (currently just serialport)
- code to interface the rlink data stream to a UNIX 'named pipe',
implemented with a C routine which is called via VHPI from VHDL.
This way the whole ghdl simulation can be controlled via a di-directional
byte stream.
The rlink backend process can connect either via a named pipe to a ghdl
simulation, or via a serial port to a FPGA board. This way the same tests
can be executed in simulation and on real hardware.
Currently two backend implementations are available:
- pi_rri: written in perl (old, slow, but full functionality)
- ti_tti: written in C++ and Tcl (new, fast, but as of V0.53 only with
limited functionality; will replace pi_rri).
4. Available system tests benches -----------------------------------------
4a. rlink tester -----------------------------------------------------
The sys_tst_rlink design is a test target for validating the rlink
and rbus functionality at all levels.
- sys_tst_rlink_n2 test bench
cd $RETROBASE/rtl/sys_gen/tst_rlink/nexys2/tb
make tb_tst_rlink_n2
time ti_rri --run="tbw tb_tst_rlink_n2" --fifo --logl=3 -- \
"package require tst_rlink" "tst_rlink::setup" "tst_rlink::test_all" |\
tee tb_tst_rlink_n2_dsim.log | egrep "(-[EW]:|FAIL|PEND|DONE)"
-> 1769140.0 ns 88446: DONE
-> real 0m15.289s
4b. w11a systems -----------------------------------------------------
The stimulus file used in the w11a core test can be executed in the
full system context (both s3board and nexys2 versions) with the
following commands. Note that the cycle number printed in the DONE
line can now vary slightly because the response time of the rlink
backend process and thus scheduling of backend vs. ghdl process
can affect the result.
- sys_w11a_s3 test bench
cd $RETROBASE/rtl/sys_gen/w11a/s3board/tb
make tb_w11a_s3
time pi_rri --fifo --timeout=40. --cmax=3 \
--run="tbw tb_w11a_s3" -- \
@../../../../w11a/tb/tb_pdp11core_stim.dat |\
tee tb_w11a_s3_stim2_dsim.log | egrep "(-[EW]:|FAIL|PEND|DONE)"
-> 7757655.0 ns 387873: DONE
-> real 0m49.835s user 0m50.203s sys 0m00.696s
- sys_w11a_n2 test bench
cd $RETROBASE/rtl/sys_gen/w11a/nexys2/tb
make tb_w11a_n2
time pi_rri --fifo --timeout=40. --cmax=3 \
--run="tbw tb_w11a_n2" -- \
@../../../../w11a/tb/tb_pdp11core_stim.dat |\
tee tb_w11a_n2_stim2_dsim.log | egrep "(-[EW]:|FAIL|PEND|DONE)"
-> 6673237.2 ns 387035: DONE
-> real 0m56.173s user 0m56.612s sys 0m00.604s
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