[英]python myhdl package how to generate verilog initial block
从大部分来自myhdl示例的代码中:
from myhdl import Signal, intbv, delay, always, now, Simulation, toVerilog
__debug = True
def ClkDriver(clk):
halfPeriod = delay(10)
@always(halfPeriod)
def driveClk():
clk.next = not clk
return driveClk
def HelloWorld(clk, outs):
counts = intbv(3)[32:]
@always(clk.posedge)
def sayHello():
outs.next = not outs
if counts >= 3 - 1:
counts.next = 0
else:
counts.next = counts + 1
if __debug__:
print "%s Hello World! outs %s %s" % (
now(), str(outs), str(outs.next))
return sayHello
clk = Signal(bool(0))
outs = Signal(intbv(0)[1:])
clkdriver_inst = ClkDriver(clk)
hello_inst = toVerilog(HelloWorld, clk, outs)
sim = Simulation(clkdriver_inst, hello_inst)
sim.run(150)
我希望它生成一个包含initial
块的verilog程序,例如:
module HelloWorld(...)
reg [31:0] counts;
initial begin
counts = 32'h3
end
always @(...
如何获得initial
块?
请注意,在old.myhdl.org/doku.php/dev:initial_values的Google缓存上,它链接到示例https://bitbucket.org/cfelton/examples/src/tip/ramrom/ 。 因此,看起来应该支持该功能。 但是,rom示例会生成静态case语句。 那不是我要找的东西。
解决此问题的三个步骤:
87784ad
的版本的87784ad
,该哈希值87784ad
在问题#105
或#150
下添加了功能。 作为virtualenv的示例,运行git clone,然后运行pip install -e <path-to-myhdl-dir>
。 toVerilog
之前将toVerilog.initial_values=True
设置toVerilog.initial_values=True
。 代码段如下。
def HelloWorld(clk, outs):
counts = [Signal(intbv(3)[32:])]
@always(clk.posedge)
def sayHello():
outs.next = not outs
if counts[0] >= 3 - 1:
counts[0].next = 0
else:
counts[0].next = counts[0] + 1
if __debug__:
print "%s Hello World! outs %s %s %d" % (
now(), str(outs), str(outs.next), counts[0])
return sayHello
clk = Signal(bool(0))
outs = Signal(intbv(0)[1:])
clkdriver_inst = ClkDriver(clk)
toVerilog.initial_values=True
hello_inst = toVerilog(HelloWorld, clk, outs)
sim = Simulation(clkdriver_inst, hello_inst)
sim.run(150)
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