yosys.git
4 years agoOops
Eddie Hung [Mon, 16 Dec 2019 21:31:05 +0000 (13:31 -0800)]
Oops

4 years agoMerge blockram tests
Eddie Hung [Mon, 16 Dec 2019 21:01:51 +0000 (13:01 -0800)]
Merge blockram tests

4 years agoUpdate xc7/xcu bram rules
Eddie Hung [Mon, 16 Dec 2019 21:00:58 +0000 (13:00 -0800)]
Update xc7/xcu bram rules

4 years agoImplement 'attributes' grammar
Eddie Hung [Mon, 16 Dec 2019 20:58:13 +0000 (12:58 -0800)]
Implement 'attributes' grammar

4 years agoMerge branch 'diego/memattr' of https://github.com/dh73/yosys into diego/memattr
Eddie Hung [Mon, 16 Dec 2019 20:07:49 +0000 (12:07 -0800)]
Merge branch 'diego/memattr' of https://github.com/dh73/yosys into diego/memattr

4 years agoFixing compiler warning/issues. Moving test script to the correct place
Diego H [Mon, 16 Dec 2019 16:23:45 +0000 (10:23 -0600)]
Fixing compiler warning/issues. Moving test script to the correct place

4 years agoRemoving fixed attribute value to !ramstyle rules
Diego H [Mon, 16 Dec 2019 05:51:58 +0000 (23:51 -0600)]
Removing fixed attribute value to !ramstyle rules

4 years agoMerging attribute rules into a single match block; Adding tests
Diego H [Mon, 16 Dec 2019 05:33:09 +0000 (23:33 -0600)]
Merging attribute rules into a single match block; Adding tests

4 years agoMerge pull request #1575 from rodrigomelo9/master
Eddie Hung [Mon, 16 Dec 2019 03:00:34 +0000 (19:00 -0800)]
Merge pull request #1575 from rodrigomelo9/master

Fixed some missing "verilog_" in documentation

4 years agoMerge pull request #1577 from gromero/for-yosys
Eddie Hung [Mon, 16 Dec 2019 02:59:55 +0000 (18:59 -0800)]
Merge pull request #1577 from gromero/for-yosys

manual: Fix text in Abstract section

4 years agoMerge pull request #1578 from noopwafel/eqneq-debug
Eddie Hung [Mon, 16 Dec 2019 02:59:36 +0000 (18:59 -0800)]
Merge pull request #1578 from noopwafel/eqneq-debug

Fix opt_expr.eqneq.cmpzero debug print

4 years agoFix opt_expr.eqneq.cmpzero debug print
Alyssa Milburn [Sun, 15 Dec 2019 19:40:38 +0000 (20:40 +0100)]
Fix opt_expr.eqneq.cmpzero debug print

4 years agoRefactoring memory attribute matching based on IEEE 1364.1 and Tool specific
Diego H [Fri, 13 Dec 2019 21:43:24 +0000 (15:43 -0600)]
Refactoring memory attribute matching based on IEEE 1364.1 and Tool specific

4 years agoMerge pull request #1533 from dh73/bram_xilinx
Eddie Hung [Fri, 13 Dec 2019 20:01:03 +0000 (12:01 -0800)]
Merge pull request #1533 from dh73/bram_xilinx

Adjust Xilinx xc7/xcu BRAM min bits threshold for RAMB18E1

4 years agoRenaming BRAM memory tests for the sake of uniformity
Diego H [Fri, 13 Dec 2019 15:33:18 +0000 (09:33 -0600)]
Renaming BRAM memory tests for the sake of uniformity

4 years agoFixed some missing "verilog_" in documentation
Rodrigo Alejandro Melo [Fri, 13 Dec 2019 13:17:05 +0000 (10:17 -0300)]
Fixed some missing "verilog_" in documentation

4 years agoFixing citation in xc7_xcu_brams.txt file. Fixing RAMB36E1 test.
Diego H [Thu, 12 Dec 2019 23:32:58 +0000 (17:32 -0600)]
Fixing citation in xc7_xcu_brams.txt file. Fixing RAMB36E1 test.

4 years agoabc9_map.v: fix Xilinx LUTRAM
Eddie Hung [Thu, 12 Dec 2019 22:56:15 +0000 (14:56 -0800)]
abc9_map.v: fix Xilinx LUTRAM

4 years agoAdding a note (TODO) in the memory_params.ys check file
Diego H [Thu, 12 Dec 2019 22:06:46 +0000 (16:06 -0600)]
Adding a note (TODO) in the memory_params.ys check file

4 years agoUpdating RAMB36E1 thresholds. Adding test for both RAMB18E1/RAMB36E1
Diego H [Thu, 12 Dec 2019 19:50:36 +0000 (13:50 -0600)]
Updating RAMB36E1 thresholds. Adding test for both RAMB18E1/RAMB36E1

4 years agoMerge https://github.com/YosysHQ/yosys into bram_xilinx
Diego H [Thu, 12 Dec 2019 19:40:05 +0000 (13:40 -0600)]
Merge https://github.com/YosysHQ/yosys into bram_xilinx

4 years agoUpdate README.md :: abc_ -> abc9_
Eddie Hung [Thu, 12 Dec 2019 00:38:43 +0000 (16:38 -0800)]
Update README.md :: abc_ -> abc9_

4 years agoFix bitwidth mismatch; suppresses iverilog warning
Eddie Hung [Wed, 11 Dec 2019 21:02:07 +0000 (13:02 -0800)]
Fix bitwidth mismatch; suppresses iverilog warning

4 years agomanual: Fix text in Abstract section
Gustavo Romero [Wed, 11 Dec 2019 11:09:48 +0000 (08:09 -0300)]
manual: Fix text in Abstract section

4 years agoMerge pull request #1564 from ZirconiumX/intel_housekeeping
David Shah [Wed, 11 Dec 2019 08:46:10 +0000 (08:46 +0000)]
Merge pull request #1564 from ZirconiumX/intel_housekeeping

Intel housekeeping

4 years agosynth_intel: a10gx -> arria10gx
Dan Ravensloft [Tue, 10 Dec 2019 13:40:32 +0000 (13:40 +0000)]
synth_intel: a10gx -> arria10gx

4 years agosynth_intel: cyclone10 -> cyclone10lp
Dan Ravensloft [Tue, 10 Dec 2019 13:31:45 +0000 (13:31 +0000)]
synth_intel: cyclone10 -> cyclone10lp

4 years agoMerge pull request #1545 from YosysHQ/eddie/ice40_wrapcarry_attr
Eddie Hung [Tue, 10 Dec 2019 01:38:48 +0000 (17:38 -0800)]
Merge pull request #1545 from YosysHQ/eddie/ice40_wrapcarry_attr

Preserve SB_CARRY name and attributes when using $__ICE40_CARRY_WRAPPER

4 years agoice40_opt to restore attributes/name when unwrapping
Eddie Hung [Mon, 9 Dec 2019 22:29:29 +0000 (14:29 -0800)]
ice40_opt to restore attributes/name when unwrapping

4 years agoice40_wrapcarry -unwrap to preserve 'src' attribute
Eddie Hung [Mon, 9 Dec 2019 22:28:54 +0000 (14:28 -0800)]
ice40_wrapcarry -unwrap to preserve 'src' attribute

4 years agounmap $__ICE40_CARRY_WRAPPER in test
Eddie Hung [Mon, 9 Dec 2019 22:20:35 +0000 (14:20 -0800)]
unmap $__ICE40_CARRY_WRAPPER in test

4 years ago-unwrap to create $lut not SB_LUT4 for opt_lut
Eddie Hung [Mon, 9 Dec 2019 21:27:09 +0000 (13:27 -0800)]
-unwrap to create $lut not SB_LUT4 for opt_lut

4 years agoSensitive to direct inst of $__ICE40_CARRY_WRAPPER; recreate SB_LUT4
Eddie Hung [Mon, 9 Dec 2019 20:45:22 +0000 (12:45 -0800)]
Sensitive to direct inst of $__ICE40_CARRY_WRAPPER; recreate SB_LUT4

4 years agoice40_wrapcarry to really preserve attributes via -unwrap option
Eddie Hung [Mon, 9 Dec 2019 19:48:28 +0000 (11:48 -0800)]
ice40_wrapcarry to really preserve attributes via -unwrap option

4 years agoMerge pull request #1555 from antmicro/fix-macc-xilinx-test
Eddie Hung [Sat, 7 Dec 2019 07:04:04 +0000 (23:04 -0800)]
Merge pull request #1555 from antmicro/fix-macc-xilinx-test

tests: arch: xilinx: Change order of arguments in macc.sh

4 years agoDrop keep=0 attributes on SB_CARRY
Eddie Hung [Sat, 7 Dec 2019 01:27:47 +0000 (17:27 -0800)]
Drop keep=0 attributes on SB_CARRY

4 years agotests: arch: xilinx: Change order of arguments in macc.sh
Jan Kowalewski [Fri, 6 Dec 2019 08:01:16 +0000 (09:01 +0100)]
tests: arch: xilinx: Change order of arguments in macc.sh

4 years agoMerge pull request #1551 from whitequark/manual-cell-operands
Clifford Wolf [Thu, 5 Dec 2019 16:24:24 +0000 (08:24 -0800)]
Merge pull request #1551 from whitequark/manual-cell-operands

Clarify semantics of comb cells, in particular shifts

4 years agoMerge SB_CARRY+SB_LUT4's attributes when creating $__ICE40_CARRY_WRAPPER
Eddie Hung [Thu, 5 Dec 2019 15:01:18 +0000 (07:01 -0800)]
Merge SB_CARRY+SB_LUT4's attributes when creating $__ICE40_CARRY_WRAPPER

4 years agoAdd WIP test for unwrapping $__ICE40_CARRY_WRAPPER
Eddie Hung [Thu, 5 Dec 2019 15:01:02 +0000 (07:01 -0800)]
Add WIP test for unwrapping $__ICE40_CARRY_WRAPPER

4 years agokernel: require \B_SIGNED=0 on $shl, $sshl, $shr, $sshr.
whitequark [Wed, 4 Dec 2019 11:59:36 +0000 (11:59 +0000)]
kernel: require \B_SIGNED=0 on $shl, $sshl, $shr, $sshr.

Before this commit, these cells would accept any \B_SIGNED and in
case of \B_SIGNED=1, would still treat the \B input as unsigned.

Also fix the Verilog frontend to never emit such constructs.

4 years agomanual: document behavior of many comb cells more precisely.
whitequark [Wed, 4 Dec 2019 11:06:05 +0000 (11:06 +0000)]
manual: document behavior of many comb cells more precisely.

4 years agoxilinx: Add tristate buffer mapping. (#1528)
Marcin Kościelnicki [Wed, 4 Dec 2019 08:44:00 +0000 (09:44 +0100)]
xilinx: Add tristate buffer mapping. (#1528)

Fixes #1225.

4 years agoiopadmap: Refactor and fix tristate buffer mapping. (#1527)
Marcin Kościelnicki [Wed, 4 Dec 2019 07:44:08 +0000 (08:44 +0100)]
iopadmap: Refactor and fix tristate buffer mapping. (#1527)

The previous code for rerouting wires when inserting tristate buffers
was overcomplicated and didn't handle all cases correctly (in
particular, only cell connections were rewired — internal connections
were not).

4 years agoxilinx: Add models for LUTRAM cells. (#1537)
Marcin Kościelnicki [Wed, 4 Dec 2019 05:31:09 +0000 (06:31 +0100)]
xilinx: Add models for LUTRAM cells. (#1537)

4 years agoCheck SB_CARRY name also preserved
Eddie Hung [Tue, 3 Dec 2019 22:51:39 +0000 (14:51 -0800)]
Check SB_CARRY name also preserved

4 years ago$__ICE40_CARRY_WRAPPER to use _TECHMAP_REPLACE_ for SB_CARRY to preserve
Eddie Hung [Tue, 3 Dec 2019 22:49:10 +0000 (14:49 -0800)]
$__ICE40_CARRY_WRAPPER to use _TECHMAP_REPLACE_ for SB_CARRY to preserve

name and attr

4 years agoice40_opt to ignore (* keep *) -ed cells
Eddie Hung [Tue, 3 Dec 2019 22:48:39 +0000 (14:48 -0800)]
ice40_opt to ignore (* keep *) -ed cells

4 years agoice40_wrapcarry to preserve SB_CARRY's attributes
Eddie Hung [Tue, 3 Dec 2019 22:48:11 +0000 (14:48 -0800)]
ice40_wrapcarry to preserve SB_CARRY's attributes

4 years agoAdd testcase
Eddie Hung [Tue, 3 Dec 2019 22:48:00 +0000 (14:48 -0800)]
Add testcase

4 years agoMerge pull request #1524 from pepijndevos/gowindffinit
Clifford Wolf [Tue, 3 Dec 2019 16:43:18 +0000 (08:43 -0800)]
Merge pull request #1524 from pepijndevos/gowindffinit

Gowin: add and test DFF init values

4 years agoupdate test
Pepijn de Vos [Tue, 3 Dec 2019 15:56:15 +0000 (16:56 +0100)]
update test

4 years agoUse -match-init to not synth contradicting init values
Pepijn de Vos [Tue, 3 Dec 2019 14:12:25 +0000 (15:12 +0100)]
Use -match-init to not synth contradicting init values

4 years agoMerge pull request #1542 from YosysHQ/dave/abc9-loop-fix
David Shah [Mon, 2 Dec 2019 10:20:21 +0000 (10:20 +0000)]
Merge pull request #1542 from YosysHQ/dave/abc9-loop-fix

abc9: Fix breaking of SCCs

5 years agoMerge pull request #1539 from YosysHQ/mwk/ilang-bounds-check
Clifford Wolf [Mon, 2 Dec 2019 00:30:48 +0000 (16:30 -0800)]
Merge pull request #1539 from YosysHQ/mwk/ilang-bounds-check

read_ilang: do bounds checking on bit indices

5 years agoabc9: Fix breaking of SCCs
David Shah [Sun, 1 Dec 2019 20:44:56 +0000 (20:44 +0000)]
abc9: Fix breaking of SCCs

Signed-off-by: David Shah <dave@ds0.me>
5 years agoMerge pull request #1540 from YosysHQ/mwk/xilinx-bufpll
Miodrag Milanović [Fri, 29 Nov 2019 16:33:41 +0000 (17:33 +0100)]
Merge pull request #1540 from YosysHQ/mwk/xilinx-bufpll

xilinx: Add missing blackbox cell for BUFPLL.

5 years agoxilinx: Add missing blackbox cell for BUFPLL.
Marcin Kościelnicki [Fri, 29 Nov 2019 15:55:29 +0000 (15:55 +0000)]
xilinx: Add missing blackbox cell for BUFPLL.

5 years agoRevert "Fold loop"
Eddie Hung [Thu, 28 Nov 2019 05:55:56 +0000 (21:55 -0800)]
Revert "Fold loop"

This reverts commit a30d5e1cc35791a98b2269c5e587c566fe8b0a35.

5 years agoread_ilang: do bounds checking on bit indices
Marcin Kościelnicki [Wed, 27 Nov 2019 21:24:39 +0000 (22:24 +0100)]
read_ilang: do bounds checking on bit indices

5 years agoAdjusting Vivado's BRAM min bits threshold for RAMB18E1
Diego H [Tue, 26 Nov 2019 23:14:41 +0000 (17:14 -0600)]
Adjusting Vivado's BRAM min bits threshold for RAMB18E1

5 years agoMerge pull request #1536 from YosysHQ/eddie/xilinx_dsp_muladd
Eddie Hung [Wed, 27 Nov 2019 16:00:22 +0000 (08:00 -0800)]
Merge pull request #1536 from YosysHQ/eddie/xilinx_dsp_muladd

xilinx_dsp: consider sign and zero-extension when packing post-multiplier adder

5 years agoMerge pull request #1501 from YosysHQ/dave/mem_copy_attr
Clifford Wolf [Wed, 27 Nov 2019 10:25:23 +0000 (11:25 +0100)]
Merge pull request #1501 from YosysHQ/dave/mem_copy_attr

memory_collect: Copy attr from RTLIL::Memory to  cell

5 years agoMerge pull request #1534 from YosysHQ/mwk/opt_share-fix
Clifford Wolf [Wed, 27 Nov 2019 10:23:16 +0000 (11:23 +0100)]
Merge pull request #1534 from YosysHQ/mwk/opt_share-fix

opt_share: Fix handling of fine cells.

5 years agoMerge pull request #1535 from YosysHQ/eddie/write_xaiger_improve
Eddie Hung [Wed, 27 Nov 2019 09:04:29 +0000 (01:04 -0800)]
Merge pull request #1535 from YosysHQ/eddie/write_xaiger_improve

write_xaiger improvements

5 years agoNo need for -abc9
Eddie Hung [Wed, 27 Nov 2019 07:08:14 +0000 (23:08 -0800)]
No need for -abc9

5 years agoopt_share: Fix handling of fine cells.
Marcin Kościelnicki [Tue, 26 Nov 2019 23:46:21 +0000 (00:46 +0100)]
opt_share: Fix handling of fine cells.

Fixes #1525.

5 years agolatch -> box
Eddie Hung [Wed, 27 Nov 2019 06:59:05 +0000 (22:59 -0800)]
latch -> box

5 years agoAdd citation
Eddie Hung [Wed, 27 Nov 2019 06:51:16 +0000 (22:51 -0800)]
Add citation

5 years agoCheck for either sign or zero extension for postAdd packing
Eddie Hung [Wed, 27 Nov 2019 05:26:53 +0000 (21:26 -0800)]
Check for either sign or zero extension for postAdd packing

5 years agoRemove notes
Eddie Hung [Wed, 27 Nov 2019 06:41:35 +0000 (22:41 -0800)]
Remove notes

5 years agoFold loop
Eddie Hung [Mon, 25 Nov 2019 23:43:37 +0000 (15:43 -0800)]
Fold loop

5 years agoDo not sigmap keep bits inside write_xaiger
Eddie Hung [Mon, 25 Nov 2019 23:42:07 +0000 (15:42 -0800)]
Do not sigmap keep bits inside write_xaiger

5 years agoxaiger: do not promote output wires
Eddie Hung [Wed, 27 Nov 2019 03:03:02 +0000 (19:03 -0800)]
xaiger: do not promote output wires

5 years agoAdd testcase derived from fastfir_dynamictaps benchmark
Eddie Hung [Wed, 27 Nov 2019 05:26:30 +0000 (21:26 -0800)]
Add testcase derived from fastfir_dynamictaps benchmark

5 years agoxilinx: Add simulation models for IOBUF and OBUFT.
Marcin Kościelnicki [Tue, 26 Nov 2019 04:04:28 +0000 (05:04 +0100)]
xilinx: Add simulation models for IOBUF and OBUFT.

5 years agoclkbufmap: Add support for inverters in clock path.
Marcin Kościelnicki [Sun, 24 Nov 2019 15:05:45 +0000 (16:05 +0100)]
clkbufmap: Add support for inverters in clock path.

5 years agoxilinx: Use INV instead of LUT1 when applicable
Marcin Kościelnicki [Sun, 24 Nov 2019 13:17:46 +0000 (14:17 +0100)]
xilinx: Use INV instead of LUT1 when applicable

5 years agoattempt to fix formatting
Pepijn de Vos [Mon, 25 Nov 2019 13:50:34 +0000 (14:50 +0100)]
attempt to fix formatting

5 years agogowin: add and test dff init values
Pepijn de Vos [Mon, 25 Nov 2019 13:33:21 +0000 (14:33 +0100)]
gowin: add and test dff init values

5 years agoMerge pull request #1520 from pietrmar/fix-1463
Eddie Hung [Sat, 23 Nov 2019 06:45:40 +0000 (22:45 -0800)]
Merge pull request #1520 from pietrmar/fix-1463

coolrunner2: remove spurious log_pop() call, fixes #1463

5 years agocoolrunner2: remove spurious log_pop() call, fixes #1463
Martin Pietryka [Sat, 23 Nov 2019 05:18:23 +0000 (06:18 +0100)]
coolrunner2: remove spurious log_pop() call, fixes #1463

This was causing a segmentation fault because there is no accompanying
log_push() call so header_count.size() became -1.

Signed-off-by: Martin Pietryka <martin@pietryka.at>
5 years agoMerge pull request #1517 from YosysHQ/clifford/optmem
Clifford Wolf [Fri, 22 Nov 2019 17:11:58 +0000 (18:11 +0100)]
Merge pull request #1517 from YosysHQ/clifford/optmem

Add "opt_mem" pass

5 years agoMerge pull request #1515 from YosysHQ/clifford/svastuff
Clifford Wolf [Fri, 22 Nov 2019 17:10:34 +0000 (18:10 +0100)]
Merge pull request #1515 from YosysHQ/clifford/svastuff

Add Verific/SVA support for "always" and "nexttime" properties

5 years agoAdd "opt_mem" pass
Clifford Wolf [Fri, 22 Nov 2019 15:58:49 +0000 (16:58 +0100)]
Add "opt_mem" pass

Signed-off-by: Clifford Wolf <clifford@clifford.at>
5 years agoAdd Verific support for SVA nexttime properties
Clifford Wolf [Fri, 22 Nov 2019 15:11:56 +0000 (16:11 +0100)]
Add Verific support for SVA nexttime properties

Signed-off-by: Clifford Wolf <clifford@clifford.at>
5 years agoImprove handling of verific primitives in "verific -import -V" mode
Clifford Wolf [Fri, 22 Nov 2019 15:00:07 +0000 (16:00 +0100)]
Improve handling of verific primitives in "verific -import -V" mode

Signed-off-by: Clifford Wolf <clifford@clifford.at>
5 years agoAdd Verific SVA support for "always" properties
Clifford Wolf [Fri, 22 Nov 2019 14:52:21 +0000 (15:52 +0100)]
Add Verific SVA support for "always" properties

Signed-off-by: Clifford Wolf <clifford@clifford.at>
5 years agoMerge pull request #1511 from YosysHQ/dave/always
Clifford Wolf [Fri, 22 Nov 2019 14:32:29 +0000 (15:32 +0100)]
Merge pull request #1511 from YosysHQ/dave/always

sv: Error checking for always_comb, always_latch and always_ff

5 years agogowin: Remove show command from tests.
Marcin Kościelnicki [Fri, 22 Nov 2019 11:15:33 +0000 (12:15 +0100)]
gowin: Remove show command from tests.

5 years agogowin: Add missing .gitignore entries
Marcin Kościelnicki [Fri, 22 Nov 2019 11:10:57 +0000 (12:10 +0100)]
gowin: Add missing .gitignore entries

5 years agoUpdate CHANGELOG and README
David Shah [Fri, 22 Nov 2019 12:46:19 +0000 (12:46 +0000)]
Update CHANGELOG and README

Signed-off-by: David Shah <dave@ds0.me>
5 years agosv: Add tests for SV always types
David Shah [Thu, 21 Nov 2019 21:06:28 +0000 (21:06 +0000)]
sv: Add tests for SV always types

Signed-off-by: David Shah <dave@ds0.me>
5 years agoproc_dlatch: Add error handling for incorrect always_(ff|latch|comb) usage
David Shah [Thu, 21 Nov 2019 20:46:41 +0000 (20:46 +0000)]
proc_dlatch: Add error handling for incorrect always_(ff|latch|comb) usage

Signed-off-by: David Shah <dave@ds0.me>
5 years agosv: Correct parsing of always_comb, always_ff and always_latch
David Shah [Thu, 21 Nov 2019 20:27:19 +0000 (20:27 +0000)]
sv: Correct parsing of always_comb, always_ff and always_latch

Signed-off-by: David Shah <dave@ds0.me>
5 years agoMerge pull request #1507 from YosysHQ/clifford/verificfixes
Clifford Wolf [Wed, 20 Nov 2019 12:49:27 +0000 (13:49 +0100)]
Merge pull request #1507 from YosysHQ/clifford/verificfixes

Some fixes in our Verific integration

5 years agoCorrectly treat empty modules as blackboxes in Verific
Clifford Wolf [Wed, 20 Nov 2019 11:56:31 +0000 (12:56 +0100)]
Correctly treat empty modules as blackboxes in Verific

Signed-off-by: Clifford Wolf <clifford@clifford.at>
5 years agoDo not rename VHDL entities to "entity(impl)" when they are top modules
Clifford Wolf [Wed, 20 Nov 2019 11:54:10 +0000 (12:54 +0100)]
Do not rename VHDL entities to "entity(impl)" when they are top modules

Signed-off-by: Clifford Wolf <clifford@clifford.at>
5 years agoMerge pull request #1449 from pepijndevos/gowin
Clifford Wolf [Tue, 19 Nov 2019 16:29:27 +0000 (17:29 +0100)]
Merge pull request #1449 from pepijndevos/gowin

Improvements for gowin support

5 years agoRemove dff init altogether
Pepijn de Vos [Tue, 19 Nov 2019 14:53:44 +0000 (15:53 +0100)]
Remove dff init altogether

The hardware does not actually support it.
In reality it is always initialised to its reset value.