yosys/docs/source/code_examples/fifo/fifo.ys

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# ========================================================
# throw in some extra text to match what we expect if we were opening an
# interactive terminal
log $ yosys fifo.v
log
log -- Parsing `fifo.v' using frontend ` -vlog2k' --
read_verilog -defer fifo.v
# turn command echoes on to use the log output as a console session
echo on
hierarchy -top addr_gen
select -set new_cells t:*
show -color maroon3 @new_cells -notitle -format dot -prefix addr_gen_hier
# ========================================================
proc
select -set new_cells t:$mux t:*dff
show -color maroon3 @new_cells -notitle -format dot -prefix addr_gen_proc
# ========================================================
clean
show -notitle -format dot -prefix addr_gen_clean
# ========================================================
design -reset
read_verilog fifo.v
hierarchy -check -top fifo
proc
select -set new_cells t:$memrd
show -color maroon3 c:fifo_reader -color cornflowerblue @new_cells -notitle -format dot -prefix rdata_proc o:rdata %ci*
# ========================================================
flatten;;
select -set rdata_path o:rdata %ci*
select -set new_cells @rdata_path o:rdata %ci3 %d i:* %d
show -color maroon3 @new_cells -notitle -format dot -prefix rdata_flat @rdata_path
# ========================================================
opt_dff
select -set new_cells t:$adffe
show -color maroon3 @new_cells -notitle -format dot -prefix rdata_adffe o:rdata %ci*
# ========================================================
wreduce
select -set new_cells t:$add %co t:$add %d
show -color maroon3 @new_cells -notitle -format dot -prefix rdata_wreduce o:rdata %ci*
# unclear if this is necessary or only because of bug(s)
opt_clean
# ========================================================
memory_dff
select -set new_cells t:$memrd_v2
show -color maroon3 @new_cells -notitle -format dot -prefix rdata_memrdv2 o:rdata %ci*
# ========================================================
alumacc
select -set new_cells t:$alu t:$macc
show -color maroon3 @new_cells -notitle -format dot -prefix rdata_alumacc o:rdata %ci*
# ========================================================
memory_collect
# or use the following commands:
# design -reset
# read_verilog fifo.v
# synth_ice40 -top fifo -run begin:map_ram
select -set new_cells t:$mem_v2
select -set rdata_path @new_cells %ci*:-$mem_v2[WR_DATA,WR_ADDR,WR_EN] @new_cells %co* %%
show -color maroon3 @new_cells -notitle -format dot -prefix rdata_coarse @rdata_path