from soc.decoder.power_decoder2 import Data
from soc.decoder.power_enums import InternalOp
-from alu_hier import CompALUOpSubset
+from .alu_hier import CompALUOpSubset
""" Computation Unit (aka "ALU Manager").
class ComputationUnitNoDelay(Elaboratable):
def __init__(self, rwid, alu):
self.rwid = rwid
- self.alu = alu # actual ALU - set as a "submodule" of the CU
+ self.alu = alu # actual ALU - set as a "submodule" of the CU
self.counter = Signal(4)
- self.go_rd_i = Signal(reset_less=True) # go read in
- self.go_wr_i = Signal(reset_less=True) # go write in
- self.issue_i = Signal(reset_less=True) # fn issue in
- self.shadown_i = Signal(reset=1) # shadow function, defaults to ON
- self.go_die_i = Signal() # go die (reset)
+ self.go_rd_i = Signal(reset_less=True) # go read in
+ self.go_wr_i = Signal(reset_less=True) # go write in
+ self.issue_i = Signal(reset_less=True) # fn issue in
+ self.shadown_i = Signal(reset=1) # shadow function, defaults to ON
+ self.go_die_i = Signal() # go die (reset)
# operation / data input
- self.oper_i = CompALUOpSubset() # operand
- self.src1_i = Signal(rwid, reset_less=True) # oper1 in
- self.src2_i = Signal(rwid, reset_less=True) # oper2 in
+ self.oper_i = CompALUOpSubset() # operand
+ self.src1_i = Signal(rwid, reset_less=True) # oper1 in
+ self.src2_i = Signal(rwid, reset_less=True) # oper2 in
- self.busy_o = Signal(reset_less=True) # fn busy out
- self.data_o = Signal(rwid, reset_less=True) # Dest out
- self.rd_rel_o = Signal(reset_less=True) # release src1/src2 request
- self.req_rel_o = Signal(reset_less=True) # release request out (valid_o)
- self.done_o = self.req_rel_o # 'normalise' API
+ self.busy_o = Signal(reset_less=True) # fn busy out
+ self.data_o = Signal(rwid, reset_less=True) # Dest out
+ self.rd_rel_o = Signal(reset_less=True) # release src1/src2 request
+ # release request out (valid_o)
+ self.req_rel_o = Signal(reset_less=True)
+ self.done_o = self.req_rel_o # 'normalise' API
def elaborate(self, platform):
m = Module()
# latches be set at the same time.
# opcode latch (not using go_rd_i) - inverted so that busy resets to 0
- m.d.sync += opc_l.s.eq(self.issue_i) # XXX NOTE: INVERTED FROM book!
+ m.d.sync += opc_l.s.eq(self.issue_i) # XXX NOTE: INVERTED FROM book!
m.d.sync += opc_l.r.eq(reset_w) # XXX NOTE: INVERTED FROM book!
# src operand latch (not using go_wr_i)
latchregister(m, self.oper_i, oper_r, self.issue_i, "oper_r")
# and one for the output from the ALU
- data_r = Signal(self.rwid, reset_less=True) # Dest register
+ data_r = Signal(self.rwid, reset_less=True) # Dest register
latchregister(m, self.alu.o, data_r, req_l.q, "data_r")
# pass the operation to the ALU
src_sel = Signal(reset_less=True)
m.d.comb += src_sel.eq(Mux(op_is_imm, opc_l.q, src_l.q))
m.d.comb += src2_or_imm.eq(Mux(op_is_imm, oper_r.imm_data.imm,
- self.src2_i))
+ self.src2_i))
# create a latch/register for src1/src2
latchregister(m, self.src1_i, self.alu.a, src_l.q)
# all request signals gated by busy_o. prevents picker problems
busy_o = self.busy_o
- m.d.comb += busy_o.eq(opc_l.q) # busy out
- m.d.comb += self.rd_rel_o.eq(src_l.q & busy_o) # src1/src2 req rel
+ m.d.comb += busy_o.eq(opc_l.q) # busy out
+ m.d.comb += self.rd_rel_o.eq(src_l.q & busy_o) # src1/src2 req rel
# on a go_read, tell the ALU we're accepting data.
# NOTE: this spells TROUBLE if the ALU isn't ready!
# go_read is only valid for one clock!
with m.If(self.go_rd_i): # src operands ready, GO!
with m.If(~self.alu.p_ready_o): # no ACK yet
- m.d.comb += self.alu.p_valid_i.eq(1) # so indicate valid
+ m.d.comb += self.alu.p_valid_i.eq(1) # so indicate valid
# only proceed if ALU says its output is valid
with m.If(self.alu.n_valid_o):
m.d.comb += self.req_rel_o.eq(req_l.q & busy_o & self.shadown_i)
# when output latch is ready, and ALU says ready, accept ALU output
with m.If(self.req_rel_o & self.go_wr_i):
- m.d.comb += self.alu.n_ready_i.eq(1) # tells ALU "thanks got it"
+ # tells ALU "thanks got it"
+ m.d.comb += self.alu.n_ready_i.eq(1)
# output the data from the latch on go_write
with m.If(self.go_wr_i):
while True:
yield
rd_rel_o = yield dut.rd_rel_o
- print ("rd_rel", rd_rel_o)
+ print("rd_rel", rd_rel_o)
if rd_rel_o:
break
yield
yield dut.go_rd_i.eq(0)
req_rel_o = yield dut.req_rel_o
result = yield dut.data_o
- print ("req_rel", req_rel_o, result)
+ print("req_rel", req_rel_o, result)
while True:
req_rel_o = yield dut.req_rel_o
result = yield dut.data_o
- print ("req_rel", req_rel_o, result)
+ print("req_rel", req_rel_o, result)
if req_rel_o:
break
yield
yield dut.go_wr_i.eq(1)
yield
result = yield dut.data_o
- print ("result", result)
+ print("result", result)
yield dut.go_wr_i.eq(0)
yield
return result
def scoreboard_sim(dut):
result = yield from op_sim(dut, 5, 2, InternalOp.OP_ADD, inv_a=0,
- imm=8, imm_ok=1)
+ imm=8, imm_ok=1)
assert result == 13
result = yield from op_sim(dut, 5, 2, InternalOp.OP_ADD, inv_a=1)
run_simulation(dut, scoreboard_sim(dut), vcd_name='test_compalu.vcd')
+
if __name__ == '__main__':
test_scoreboard()
projects / soc.git / blobdiff