FPGA/myhdl
1
0
Fork 0
mirror of https://github.com/myhdl/myhdl.git synced 2024-12-14 07:44:38 +08:00
Code Issues Projects Releases Wiki Activity

partial check in

Browse Source
This commit is contained in:
jand 2005-12-11 16:30:52 +00:00
parent 42f26ccded
commit cacdd4e884
3 changed files with 37 additions and 39 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

68
example/manual/fsm.py
View File

@ -1,8 +1,5 @@
from __future__ import generators
from myhdl import *
# SEARCH, CONFIRM, SYNC = range(3)
ACTIVE_LOW = 0
FRAME_SIZE = 8
t_State = enum('SEARCH', 'CONFIRM', 'SYNC')
@ -21,42 +18,39 @@ def FramerCtrl(SOF, state, syncFlag, clk, reset_n):
index = Signal(0) # position in frame
@always(clk.posedge, reset_n.negedge)
def FSM():
while 1:
yield posedge(clk), negedge(reset_n)
if reset_n == ACTIVE_LOW:
SOF.next = 0
index.next = 0
state.next = t_State.SEARCH
else:
index.next = (index + 1) % FRAME_SIZE
SOF.next = 0
if state == t_State.SEARCH:
index.next = 1
if syncFlag:
state.next = t_State.CONFIRM
elif state == t_State.CONFIRM:
if index == 0:
if syncFlag:
state.next = t_State.SYNC
else:
state.next = t_State.SEARCH
elif state == t_State.SYNC:
if index == 0:
if not syncFlag:
state.next = t_State.SEARCH
SOF.next = (index == FRAME_SIZE-1)
else:
raise ValueError("Undefined state")
if reset_n == ACTIVE_LOW:
SOF.next = 0
index.next = 0
state.next = t_State.SEARCH
FSM_1 = FSM()
return FSM_1
else:
index.next = (index + 1) % FRAME_SIZE
SOF.next = 0
if state == t_State.SEARCH:
index.next = 1
if syncFlag:
state.next = t_State.CONFIRM
elif state == t_State.CONFIRM:
if index == 0:
if syncFlag:
state.next = t_State.SYNC
else:
state.next = t_State.SEARCH
elif state == t_State.SYNC:
if index == 0:
if not syncFlag:
state.next = t_State.SEARCH
SOF.next = (index == FRAME_SIZE-1)
else:
raise ValueError("Undefined state")
return FSM
def testbench():

4
example/manual/hello1.py
View File

@ -1,8 +1,10 @@
from myhdl import Signal, delay, always, now, Simulation
def HelloWorld():
interval = delay(10)
@always(delay(10))
@always(interval)
def sayHello():
print "%s Hello World!" % now()

4
example/manual/hello2.py
View File

@ -2,7 +2,9 @@ from myhdl import Signal, delay, always, now, Simulation
def ClkDriver(clk):
@always(delay(10))
halfPeriod = delay(10)
@always(halfPeriod)
def driveClk():
clk.next = not clk