1 """ LOAD / STORE Computation Unit.
3 This module covers POWER9-compliant Load and Store operations,
4 with selection on each between immediate and indexed mode as
5 options for the calculation of the Effective Address (EA),
6 and also "update" mode which optionally stores that EA into
7 an additional register.
10 Note: it took 15 attempts over several weeks to redraw the diagram
11 needed to capture this FSM properly. To understand it fully, please
12 take the time to review the links, video, and diagram.
15 Stores are activated when Go_Store is enabled, and use a sync'd "ADD" to
16 compute the "Effective Address", and, when ready the operand (src3_i)
17 is stored in the computed address (passed through to the PortInterface)
19 Loads are activated when Go_Write[0] is enabled. The EA is computed,
20 and (as long as there was no exception) the data comes out (at any
21 time from the PortInterface), and is captured by the LDCompSTUnit.
23 Both LD and ST may request that the address be computed from summing
24 operand1 (src[0]) with operand2 (src[1]) *or* by summing operand1 with
25 the immediate (from the opcode).
27 Both LD and ST may also request "update" mode (op_is_update) which
28 activates the use of Go_Write[1] to control storage of the EA into
29 a *second* operand in the register file.
31 Thus this module has *TWO* write-requests to the register file and
32 *THREE* read-requests to the register file (not all at the same time!)
33 The regfile port usage is:
45 It's a multi-level Finite State Machine that (unfortunately) nmigen.FSM
46 is not suited to (nmigen.FSM is clock-driven, and some aspects of
47 the nested FSMs below are *combinatorial*).
49 * One FSM covers Operand collection and communication address-side
50 with the LD/ST PortInterface. its role ends when "RD_DONE" is asserted
52 * A second FSM activates to cover LD. it activates if op_is_ld is true
54 * A third FSM activates to cover ST. it activates if op_is_st is true
56 * The "overall" (fourth) FSM coordinates the progression and completion
57 of the three other FSMs, firing "WR_RESET" which switches off "busy"
60 https://libre-soc.org/3d_gpu/ld_st_comp_unit.jpg
62 Links including to walk-through videos:
63 * https://libre-soc.org/3d_gpu/architecture/6600scoreboard/
64 * http://libre-soc.org/openpower/isa/fixedload
65 * http://libre-soc.org/openpower/isa/fixedstore
68 * https://bugs.libre-soc.org/show_bug.cgi?id=302
72 * EA - Effective Address
77 from nmigen
.compat
.sim
import run_simulation
78 from nmigen
.cli
import verilog
, rtlil
79 from nmigen
import Module
, Signal
, Mux
, Cat
, Elaboratable
, Array
, Repl
80 from nmigen
.hdl
.rec
import Record
, Layout
82 from nmutil
.latch
import SRLatch
, latchregister
84 from soc
.experiment
.compalu_multi
import go_record
, CompUnitRecord
85 from soc
.experiment
.l0_cache
import PortInterface
86 from soc
.experiment
.testmem
import TestMemory
88 from soc
.decoder
.power_enums
import InternalOp
, Function
89 from soc
.fu
.ldst
.ldst_input_record
import CompLDSTOpSubset
92 class LDSTCompUnitRecord(CompUnitRecord
):
93 def __init__(self
, rwid
, name
=None):
94 CompUnitRecord
.__init
__(self
, CompLDSTOpSubset
, rwid
,
95 n_src
=3, n_dst
=2, name
=name
)
97 self
.ad
= go_record(1, name
="ad") # address go in, req out
98 self
.st
= go_record(1, name
="st") # store go in, req out
100 self
.addr_exc_o
= Signal(reset_less
=True) # address exception
102 self
.ld_o
= Signal(reset_less
=True) # operation is a LD
103 self
.st_o
= Signal(reset_less
=True) # operation is a ST
105 # hmm... are these necessary?
106 self
.load_mem_o
= Signal(reset_less
=True) # activate memory LOAD
107 self
.stwd_mem_o
= Signal(reset_less
=True) # activate memory STORE
110 class LDSTCompUnit(Elaboratable
):
111 """LOAD / STORE Computation Unit
116 * :pi: a PortInterface to the memory subsystem (read-write capable)
117 * :rwid: register width
118 * :awid: address width
122 * :src_i: Source Operands (RA/RB/RC) - managed by rd[0-3] go/req
126 * :data_o: Dest out (LD) - managed by wr[0] go/req
127 * :addr_o: Address out (LD or ST) - managed by wr[1] go/req
128 * :addr_exc_o: Address/Data Exception occurred. LD/ST must terminate
130 TODO: make addr_exc_o a data-type rather than a single-bit signal
136 * :oper_i: operation being carried out (POWER9 decode LD/ST subset)
137 * :issue_i: LD/ST is being "issued".
138 * :shadown_i: Inverted-shadow is being held (stops STORE *and* WRITE)
139 * :go_rd_i: read is being actioned (latches in src regs)
140 * :go_wr_i: write mode (exactly like ALU CompUnit)
141 * :go_ad_i: address is being actioned (triggers actual mem LD)
142 * :go_st_i: store is being actioned (triggers actual mem STORE)
143 * :go_die_i: resets the unit back to "wait for issue"
145 Control Signals (Out)
146 ---------------------
148 * :busy_o: function unit is busy
149 * :rd_rel_o: request src1/src2
150 * :adr_rel_o: request address (from mem)
151 * :sto_rel_o: request store (to mem)
152 * :req_rel_o: request write (result)
153 * :load_mem_o: activate memory LOAD
154 * :stwd_mem_o: activate memory STORE
156 Note: load_mem_o, stwd_mem_o and req_rel_o MUST all be acknowledged
157 in a single cycle and the CompUnit set back to doing another op.
158 This means deasserting go_st_i, go_ad_i or go_wr_i as appropriate
159 depending on whether the operation is a ST or LD.
162 def __init__(self
, pi
, rwid
=64, awid
=48, debugtest
=False):
166 self
.cu
= cu
= LDSTCompUnitRecord(rwid
)
167 self
.debugtest
= debugtest
169 # POWER-compliant LD/ST has index and update: *fixed* number of ports
170 self
.n_src
= n_src
= 3 # RA, RB, RT/RS
171 self
.n_dst
= n_dst
= 2 # RA, RT/RS
173 # set up array of src and dest signals
174 for i
in range(n_src
):
175 j
= i
+ 1 # name numbering to match src1/src2
177 setattr(self
, name
, getattr(cu
, name
))
180 for i
in range(n_dst
):
181 j
= i
+ 1 # name numbering to match dest1/2...
182 name
= "dest%d_i" % j
183 setattr(self
, name
, getattr(cu
, name
))
191 self
.go_rd_i
= self
.rd
.go
# temporary naming
192 self
.go_wr_i
= self
.wr
.go
# temporary naming
193 self
.go_ad_i
= self
.ad
.go
# temp naming: go address in
194 self
.go_st_i
= self
.st
.go
# temp naming: go store in
196 self
.rd_rel_o
= self
.rd
.rel
# temporary naming
197 self
.req_rel_o
= self
.wr
.rel
# temporary naming
198 self
.adr_rel_o
= self
.ad
.rel
# request address (from mem)
199 self
.sto_rel_o
= self
.st
.rel
# request store (to mem)
201 self
.issue_i
= cu
.issue_i
202 self
.shadown_i
= cu
.shadown_i
203 self
.go_die_i
= cu
.go_die_i
205 self
.oper_i
= cu
.oper_i
206 self
.src_i
= cu
._src
_i
209 self
.data_o
= self
.dest
[0] # Dest1 out: RT
210 self
.addr_o
= self
.dest
[1] # Address out (LD or ST) - Update => RA
211 self
.addr_exc_o
= cu
.addr_exc_o
212 self
.done_o
= cu
.done_o
213 self
.busy_o
= cu
.busy_o
218 self
.load_mem_o
= cu
.load_mem_o
219 self
.stwd_mem_o
= cu
.stwd_mem_o
221 def elaborate(self
, platform
):
227 issue_i
= self
.issue_i
229 #####################
230 # latches for the FSM.
231 m
.submodules
.opc_l
= opc_l
= SRLatch(sync
=False, name
="opc")
232 m
.submodules
.src_l
= src_l
= SRLatch(False, self
.n_src
, name
="src")
233 m
.submodules
.alu_l
= alu_l
= SRLatch(sync
=False, name
="alu")
234 m
.submodules
.adr_l
= adr_l
= SRLatch(sync
=False, name
="adr")
235 m
.submodules
.lod_l
= lod_l
= SRLatch(sync
=False, name
="lod")
236 m
.submodules
.sto_l
= sto_l
= SRLatch(sync
=False, name
="sto")
237 m
.submodules
.wri_l
= wri_l
= SRLatch(sync
=False, name
="wri")
238 m
.submodules
.upd_l
= upd_l
= SRLatch(sync
=False, name
="upd")
239 m
.submodules
.rst_l
= rst_l
= SRLatch(sync
=False, name
="rst")
245 op_is_ld
= Signal(reset_less
=True)
246 op_is_st
= Signal(reset_less
=True)
248 # ALU/LD data output control
249 alu_valid
= Signal(reset_less
=True) # ALU operands are valid
250 alu_ok
= Signal(reset_less
=True) # ALU out ok (1 clock delay valid)
251 addr_ok
= Signal(reset_less
=True) # addr ok (from PortInterface)
252 ld_ok
= Signal(reset_less
=True) # LD out ok from PortInterface
253 wr_any
= Signal(reset_less
=True) # any write (incl. store)
254 rda_any
= Signal(reset_less
=True) # any read for address ops
255 rd_done
= Signal(reset_less
=True) # all *necessary* operands read
256 wr_reset
= Signal(reset_less
=True) # final reset condition
259 alu_o
= Signal(self
.rwid
, reset_less
=True)
260 ldd_o
= Signal(self
.rwid
, reset_less
=True)
262 # XXX TODO ZEROing just lije in ComUnit
264 # select immediate or src2 reg to add
265 src2_or_imm
= Signal(self
.rwid
, reset_less
=True)
266 src_sel
= Signal(reset_less
=True)
268 ##############################
269 # reset conditions for latches
271 # temporaries (also convenient when debugging)
272 reset_o
= Signal(reset_less
=True) # reset opcode
273 reset_w
= Signal(reset_less
=True) # reset write
274 reset_u
= Signal(reset_less
=True) # reset update
275 reset_a
= Signal(reset_less
=True) # reset adr latch
276 reset_i
= Signal(reset_less
=True) # issue|die (use a lot)
277 reset_r
= Signal(self
.n_src
, reset_less
=True) # reset src
278 reset_s
= Signal(reset_less
=True) # reset store
280 comb
+= reset_i
.eq(issue_i | self
.go_die_i
) # various
281 comb
+= reset_o
.eq(wr_reset | self
.go_die_i
) # opcode reset
282 comb
+= reset_w
.eq(self
.wr
.go
[0] | self
.go_die_i
) # write reg 1
283 comb
+= reset_u
.eq(self
.wr
.go
[1] | self
.go_die_i
) # update (reg 2)
284 comb
+= reset_s
.eq(self
.go_st_i | self
.go_die_i
) # store reset
285 comb
+= reset_r
.eq(self
.rd
.go |
Repl(self
.go_die_i
, self
.n_src
))
286 comb
+= reset_a
.eq(self
.go_ad_i | self
.go_die_i
)
288 ##########################
289 # FSM implemented through sequence of latches. approximately this:
291 # - src_l[0] : operands
293 # - alu_l : looks after add of src1/2/imm (EA)
294 # - adr_l : waits for add (EA)
295 # - upd_l : waits for adr and Regfile (port 2)
297 # - lod_l : waits for adr (EA) and for LD Data
298 # - wri_l : waits for LD Data and Regfile (port 1)
299 # - st_l : waits for alu and operand2
300 # - rst_l : waits for all FSM paths to converge.
301 # NOTE: use sync to stop combinatorial loops.
303 # opcode latch - inverted so that busy resets to 0
304 # note this MUST be sync so as to avoid a combinatorial loop
305 # between busy_o and issue_i on the reset latch (rst_l)
306 sync
+= opc_l
.s
.eq(issue_i
) # XXX NOTE: INVERTED FROM book!
307 sync
+= opc_l
.r
.eq(reset_o
) # XXX NOTE: INVERTED FROM book!
310 sync
+= src_l
.s
.eq(Repl(issue_i
, self
.n_src
))
311 sync
+= src_l
.r
.eq(reset_r
)
313 # alu latch. use sync-delay between alu_ok and valid to generate pulse
314 comb
+= alu_l
.s
.eq(reset_i
)
315 comb
+= alu_l
.r
.eq(alu_ok
& ~alu_valid
& ~rda_any
)
318 comb
+= adr_l
.s
.eq(reset_i
)
319 sync
+= adr_l
.r
.eq(reset_a
)
322 comb
+= lod_l
.s
.eq(reset_i
)
323 comb
+= lod_l
.r
.eq(ld_ok
)
326 comb
+= wri_l
.s
.eq(issue_i
)
327 sync
+= wri_l
.r
.eq(reset_w
)
329 # update-mode operand latch (EA written to reg 2)
330 sync
+= upd_l
.s
.eq(reset_i
)
331 sync
+= upd_l
.r
.eq(reset_u
)
334 comb
+= sto_l
.s
.eq(addr_ok
& op_is_st
)
335 comb
+= sto_l
.r
.eq(reset_s
)
338 comb
+= rst_l
.s
.eq(addr_ok
) # start when address is ready
339 comb
+= rst_l
.r
.eq(issue_i
)
341 # create a latch/register for the operand
342 oper_r
= CompLDSTOpSubset(name
="oper_r") # Dest register
343 latchregister(m
, self
.oper_i
, oper_r
, self
.issue_i
, name
="oper_l")
346 ldd_r
= Signal(self
.rwid
, reset_less
=True) # Dest register
347 latchregister(m
, ldd_o
, ldd_r
, ld_ok
, name
="ldo_r")
349 # and for each input from the incoming src operands
351 for i
in range(self
.n_src
):
353 src_r
= Signal(self
.rwid
, name
=name
, reset_less
=True)
354 latchregister(m
, self
.src_i
[i
], src_r
, src_l
.q
[i
], name
+ '_l')
357 # and one for the output from the ADD (for the EA)
358 addr_r
= Signal(self
.rwid
, reset_less
=True) # Effective Address Latch
359 latchregister(m
, alu_o
, addr_r
, alu_l
.q
, "ea_r")
361 # select either immediate or src2 if opcode says so
362 op_is_imm
= oper_r
.imm_data
.imm_ok
363 src2_or_imm
= Signal(self
.rwid
, reset_less
=True)
364 m
.d
.comb
+= src2_or_imm
.eq(Mux(op_is_imm
, oper_r
.imm_data
.imm
, srl
[1]))
366 # now do the ALU addr add: one cycle, and say "ready" (next cycle, too)
367 sync
+= alu_o
.eq(srl
[0] + src2_or_imm
) # actual EA
368 sync
+= alu_ok
.eq(alu_valid
) # keep ack in sync with EA
370 # decode bits of operand (latched)
371 comb
+= op_is_st
.eq(oper_r
.insn_type
== InternalOp
.OP_STORE
) # ST
372 comb
+= op_is_ld
.eq(oper_r
.insn_type
== InternalOp
.OP_LOAD
) # LD
373 op_is_update
= oper_r
.update
# UPDATE
374 comb
+= self
.load_mem_o
.eq(op_is_ld
& self
.go_ad_i
)
375 comb
+= self
.stwd_mem_o
.eq(op_is_st
& self
.go_st_i
)
376 comb
+= self
.ld_o
.eq(op_is_ld
)
377 comb
+= self
.st_o
.eq(op_is_st
)
379 ############################
380 # Control Signal calculation
384 comb
+= self
.busy_o
.eq(opc_l
.q
) # | self.pi.busy_o) # busy out
386 # 1st operand read-request is simple: always need it
387 comb
+= self
.rd
.rel
[0].eq(src_l
.q
[0] & busy_o
)
389 # 2nd operand only needed when immediate is not active
390 comb
+= self
.rd
.rel
[1].eq(src_l
.q
[1] & busy_o
& ~op_is_imm
)
392 # note when the address-related read "go" signals are active
393 comb
+= rda_any
.eq(self
.rd
.go
[0] | self
.rd
.go
[1])
395 # alu input valid when 1st and 2nd ops done (or imm not active)
396 comb
+= alu_valid
.eq(busy_o
& ~
(self
.rd
.rel
[0] | self
.rd
.rel
[1]))
398 # 3rd operand only needed when operation is a store
399 comb
+= self
.rd
.rel
[2].eq(src_l
.q
[2] & busy_o
& op_is_st
)
401 # all reads done when alu is valid and 3rd operand needed
402 comb
+= rd_done
.eq(alu_valid
& ~self
.rd
.rel
[2])
404 # address release only if addr ready, but Port must be idle
405 comb
+= self
.adr_rel_o
.eq(adr_l
.q
& busy_o
)
407 # store release when st ready *and* all operands read (and no shadow)
408 comb
+= self
.st
.rel
.eq(sto_l
.q
& busy_o
& rd_done
& op_is_st
&
411 # request write of LD result. waits until shadow is dropped.
412 comb
+= self
.wr
.rel
[0].eq(wri_l
.q
& busy_o
& lod_l
.qn
& op_is_ld
&
415 # request write of EA result only in update mode
416 comb
+= self
.wr
.rel
[1].eq(upd_l
.q
& busy_o
& op_is_update
&
419 # provide "done" signal: select req_rel for non-LD/ST, adr_rel for LD/ST
420 comb
+= wr_any
.eq(self
.st
.go | self
.wr
.go
[0] | self
.wr
.go
[1])
421 comb
+= wr_reset
.eq(rst_l
.q
& busy_o
& self
.shadown_i
&
422 ~
(self
.st
.rel | self
.wr
.rel
[0] | self
.wr
.rel
[1]) &
423 (lod_l
.qn | op_is_st
))
424 comb
+= self
.done_o
.eq(wr_reset
)
426 ######################
427 # Data/Address outputs
429 # put the LD-output register directly onto the output bus on a go_write
430 with m
.If(self
.wr
.go
[0]):
431 comb
+= self
.data_o
.eq(ldd_r
)
433 # "update" mode, put address out on 2nd go-write
434 with m
.If(op_is_update
& self
.wr
.go
[1]):
435 comb
+= self
.addr_o
.eq(addr_r
)
437 ###########################
438 # PortInterface connections
441 # connect to LD/ST PortInterface.
442 comb
+= pi
.is_ld_i
.eq(op_is_ld
& busy_o
) # decoded-LD
443 comb
+= pi
.is_st_i
.eq(op_is_st
& busy_o
) # decoded-ST
444 comb
+= pi
.op
.eq(self
.oper_i
) # op details (not all needed)
446 comb
+= pi
.addr
.data
.eq(addr_r
) # EA from adder
447 comb
+= pi
.addr
.ok
.eq(alu_ok
& lod_l
.q
) # "go do address stuff"
448 comb
+= self
.addr_exc_o
.eq(pi
.addr_exc_o
) # exception occurred
449 comb
+= addr_ok
.eq(self
.pi
.addr_ok_o
) # no exc, address fine
450 # ld - ld gets latched in via lod_l
451 comb
+= ldd_o
.eq(pi
.ld
.data
) # ld data goes into ld reg (above)
452 comb
+= ld_ok
.eq(pi
.ld
.ok
) # ld.ok *closes* (freezes) ld data
453 # store - data goes in based on go_st
454 comb
+= pi
.st
.data
.eq(srl
[2]) # 3rd operand latch
455 comb
+= pi
.st
.ok
.eq(self
.st
.go
) # go store signals st data valid
467 yield from self
.oper_i
.ports()
468 yield from self
.src_i
476 yield self
.load_mem_o
477 yield self
.stwd_mem_o
483 def wait_for(sig
, wait
=True, test1st
=False):
485 print("wait for", sig
, v
, wait
, test1st
)
486 if test1st
and bool(v
) == wait
:
491 #print("...wait for", sig, v)
496 def store(dut
, src1
, src2
, src3
, imm
, imm_ok
=True, update
=False):
497 print ("ST", src1
, src2
, src3
, imm
, imm_ok
, update
)
498 yield dut
.oper_i
.insn_type
.eq(InternalOp
.OP_STORE
)
499 yield dut
.src1_i
.eq(src1
)
500 yield dut
.src2_i
.eq(src2
)
501 yield dut
.src3_i
.eq(src3
)
502 yield dut
.oper_i
.imm_data
.imm
.eq(imm
)
503 yield dut
.oper_i
.imm_data
.imm_ok
.eq(imm_ok
)
504 yield dut
.oper_i
.update
.eq(update
)
505 yield dut
.issue_i
.eq(1)
507 yield dut
.issue_i
.eq(0)
510 yield dut
.rd
.go
.eq(0b101)
512 yield dut
.rd
.go
.eq(0b111)
513 yield from wait_for(dut
.rd
.rel
)
514 yield dut
.rd
.go
.eq(0)
516 yield from wait_for(dut
.adr_rel_o
, False, test1st
=True)
517 #yield from wait_for(dut.adr_rel_o)
518 #yield dut.ad.go.eq(1)
520 #yield dut.ad.go.eq(0)
523 yield from wait_for(dut
.wr
.rel
[1])
524 yield dut
.wr
.go
.eq(0b10)
526 addr
= yield dut
.addr_o
528 yield dut
.wr
.go
.eq(0)
532 yield from wait_for(dut
.sto_rel_o
)
533 yield dut
.go_st_i
.eq(1)
535 yield dut
.go_st_i
.eq(0)
536 yield from wait_for(dut
.busy_o
, False)
537 #wait_for(dut.stwd_mem_o)
542 def load(dut
, src1
, src2
, imm
, imm_ok
=True, update
=False):
543 print ("LD", src1
, src2
, imm
, imm_ok
, update
)
544 yield dut
.oper_i
.insn_type
.eq(InternalOp
.OP_LOAD
)
545 yield dut
.src1_i
.eq(src1
)
546 yield dut
.src2_i
.eq(src2
)
547 yield dut
.oper_i
.imm_data
.imm
.eq(imm
)
548 yield dut
.oper_i
.imm_data
.imm_ok
.eq(imm_ok
)
549 yield dut
.issue_i
.eq(1)
551 yield dut
.issue_i
.eq(0)
554 yield dut
.rd
.go
.eq(0b01)
556 yield dut
.rd
.go
.eq(0b11)
557 yield from wait_for(dut
.rd
.rel
)
558 yield dut
.rd
.go
.eq(0)
560 yield from wait_for(dut
.adr_rel_o
, False, test1st
=True)
561 #yield dut.ad.go.eq(1)
563 #yield dut.ad.go.eq(0)
566 yield from wait_for(dut
.wr
.rel
[1])
567 yield dut
.wr
.go
.eq(0b10)
569 addr
= yield dut
.addr_o
571 yield dut
.wr
.go
.eq(0)
575 yield from wait_for(dut
.wr
.rel
[0], test1st
=True)
576 yield dut
.wr
.go
.eq(1)
578 data
= yield dut
.data_o
580 yield dut
.wr
.go
.eq(0)
581 yield from wait_for(dut
.busy_o
)
583 # wait_for(dut.stwd_mem_o)
587 def scoreboard_sim(dut
):
592 # two STs (different addresses)
593 yield from store(dut
, 4, 0, 3, 2) # ST reg4 into addr rfile[reg3]+2
594 yield from store(dut
, 2, 0, 9, 2) # ST reg4 into addr rfile[reg9]+2
596 # two LDs (deliberately LD from the 1st address then 2nd)
597 data
, addr
= yield from load(dut
, 4, 0, 2)
598 assert data
== 0x0003, "returned %x" % data
599 data
, addr
= yield from load(dut
, 2, 0, 2)
600 assert data
== 0x0009, "returned %x" % data
604 yield from store(dut
, 4, 5, 3, 0, imm_ok
=False)
605 data
, addr
= yield from load(dut
, 4, 5, 0, imm_ok
=False)
606 assert data
== 0x0003, "returned %x" % data
608 # update-immediate version
609 addr
= yield from store(dut
, 4, 6, 3, 2, update
=True)
610 assert addr
== 0x0006, "returned %x" % addr
612 # update-indexed version
613 data
, addr
= yield from load(dut
, 4, 5, 0, imm_ok
=False, update
=True)
614 assert addr
== 0x0009, "returned %x" % addr
616 class TestLDSTCompUnit(LDSTCompUnit
):
618 def __init__(self
, rwid
):
619 from soc
.experiment
.l0_cache
import TstL0CacheBuffer
620 self
.l0
= l0
= TstL0CacheBuffer()
621 pi
= l0
.l0
.dports
[0].pi
622 LDSTCompUnit
.__init
__(self
, pi
, rwid
, 4)
624 def elaborate(self
, platform
):
625 m
= LDSTCompUnit
.elaborate(self
, platform
)
626 m
.submodules
.l0
= self
.l0
627 m
.d
.comb
+= self
.ad
.go
.eq(self
.ad
.rel
) # link addr-go direct to rel
631 def test_scoreboard():
633 dut
= TestLDSTCompUnit(16)
634 vl
= rtlil
.convert(dut
, ports
=dut
.ports())
635 with
open("test_ldst_comp.il", "w") as f
:
638 run_simulation(dut
, scoreboard_sim(dut
), vcd_name
='test_ldst_comp.vcd')
641 if __name__
== '__main__':