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|
#!/usr/bin/python -O
"""
# GAL/PAL chip emulator
#
# Copyright (C) 2008 Michael Buesch <mb@bu3sch.de>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
"""
import sys
import re
VERSION_STRING = "0.4"
class GalemuEx(Exception):
"Galemu Exception"
class LogicEx(GalemuEx):
"GAL logics exception"
class OlmcInput:
"The OR input logic to an OLMC"
class AndRange:
"Fuse range for the AND array"
def __init__(self, start, nrFuses):
self.start = start
self.end = start + nrFuses - 1
self.nrFuses = nrFuses
def __init__(self, andArrayRanges):
"andArrayRanges = list of class AndRange to specify the input arrays"
self.andArrayRanges = andArrayRanges
self.olmc = None
def setOlmcRef(self, olmc):
self.olmc = olmc
def getState(self):
"Get the state of the OR-output"
gal = self.olmc.gal
# Walk the AND terms and apply an OR operation to the results
orState = False
for r in self.andArrayRanges:
andState = gal.getProductTermState(r.start, self)
if andState:
orState = True
if orState:
break
return orState
class OlmcOutput:
"The output pin of an OLMC"
def __init__(self, outputPin):
"outputPin = Pin number of the output"
self.olmc = None
self.pin = outputPin
def setOlmcRef(self, olmc):
self.olmc = olmc
def getState(self):
"Get the boolean state of this output"
return self.olmc.getOutputState()
def getPin(self):
"Get the pin number"
return self.pin
class OlmcOE:
"OutputEnable of an OLMC"
def __init__(self, andArrayStart, nrFuses):
"""andArrayStart = Startfuse of the AND array for the OE
nrFuses = Number of fuses for the OE AND array"""
self.olmc = None
self.start = andArrayStart
self.end = andArrayStart + nrFuses - 1
self.nrFuses = nrFuses
def setOlmcRef(self, olmc):
self.olmc = olmc
def getState(self):
"Returns True, if the output is enabled or False otherwise."
gal = self.olmc.gal
andState = gal.getProductTermState(self.start, self)
# The OE state is connected active-low to the AND-array
oeState = not andState
return oeState
class OlmcBackpropagation:
"Defines the backpropagation mechanism of an OLMC"
def __init__(self, column, invColumn):
"""column = AND-array column of the non-inverting connection
invColumn = AND-array column of the inverting connection"""
self.olmc = None
self.column = column
self.invColumn = invColumn
def setOlmcRef(self, olmc):
self.olmc = olmc
def getState(self):
"Get the state of this backpropagation"
if self.olmc.getMode() == Olmc.MODE_REGISTERED:
Q_inv = not self.olmc.getRegisterState()
return Q_inv
else:
return self.olmc.getOutputState()
def getInvState(self):
"Get the inverted state of this backpropagation"
return not self.getState()
def getColumn(self):
"Get the Fusearray column for the Non-inverted backpropagation"
return self.column
def getInvColumn(self):
"Get the Fusearray column for the inverted backpropagation"
return self.invColumn
class Olmc:
"An Output-Logic-Macrocell"
MODE_REGISTERED = 0
MODE_COMBINATORIAL = 1
def __init__(self, gal, input, output, bp, oe, mode = MODE_COMBINATORIAL, activelow = True):
"""gal = GalXXXX(...),
input = OlmcInput(...),
output = OlmcOutput(...),
bp = OlmeBackpropagation(...),
oe = OlmeOE(...),
mode = MODE_***,
activelow = True or False"""
self.gal = gal
self.input = input
self.input.setOlmcRef(self)
self.output = output
self.output.setOlmcRef(self)
self.bp = bp
self.bp.setOlmcRef(self)
self.oe = oe
self.oe.setOlmcRef(self)
self.mode = mode
self.activelow = activelow
self.state = False
self.newState = None
self.previousClkState = None # Unknown
def AR(self):
"Asynchronous reset"
if self.mode != Olmc.MODE_REGISTERED:
raise LogicEx("OLMC: Asynchronous reset on combinatorial OLMC")
self.state = False
def SP(self):
"Synchronous preset"
if self.mode != Olmc.MODE_REGISTERED:
raise LogicEx("OLMC: Synchronous preset on combinatorial OLMC")
self.newState = True
def CLK(self, clkpinState):
"Clock signal"
if self.mode != Olmc.MODE_REGISTERED:
return
# Only trigger a clock on a _rising_ edge.
if clkpinState == self.previousClkState:
return # No edge
self.previousClkState = clkpinState
if not clkpinState:
return # Not rising
# First check if we have a synchronous preset.
if self.gal.getSyncPreset().getState():
self.SP()
else:
# No preset.
# Load the product term state into the register.
self.newState = self.input.getState()
def commitCLK(self):
if self.newState is not None:
self.state = self.newState
self.newState = None
def __getOutputState(self):
if not self.oe.getState():
# This output is not enabled
return False
if self.mode == Olmc.MODE_REGISTERED:
return self.getRegisterState()
else:
return self.input.getState()
def getOutputState(self):
state = self.__getOutputState()
if self.activelow:
return not state
return state
def getOutputPin(self):
"Get the output pin object"
return self.output
def getMode(self):
"Returns the current Olmc.MODE_***"
return self.mode
def getRegisterState(self):
"Returns the raw flipflop register state"
if self.mode != Olmc.MODE_REGISTERED:
raise GalemuEx("OLMC: Called getRegisterState() on combinatorial OLMC")
return self.state
def getBackpropagation(self):
"Returns the OlmcBackpropagation() object"
return self.bp
class AsyncReset:
"Asynchronous reset trigger"
def __init__(self, gal, row):
"""gal = GalXXXX(...)
row = AND-array row of the AR trigger"""
self.gal = gal
self.row = row
def getState(self):
"Returns the logical state of the Asynchronous Reset trigger"
fuseIdx = self.row * self.gal.nrArrayColumns()
andState = self.gal.getProductTermState(fuseIdx, self)
return andState
class SyncPreset:
"synchronous preset trigger"
def __init__(self, gal, row):
"""gal = GalXXXX(...)
row = AND-array row of the SP trigger"""
self.gal = gal
self.row = row
def getState(self):
"Returns the logical state of the Synchronous Preset trigger"
fuseIdx = self.row * self.gal.nrArrayColumns()
andState = self.gal.getProductTermState(fuseIdx, self)
return andState
class GalInput:
"Input pins to the GAL chip"
def __init__(self, gal, inputPin, column, invColumn, isCLK = False):
"""gal = GalXXXX(...)
inputPin = Pin number of the input
column = AND-array column of the non-inverting input
invColumn = AND-array column of the inverting input
isCLK = is the pin connected to the flipflop CLKs"""
self.gal = gal
self.pin = inputPin
self.column = column
self.invColumn = invColumn
self.isCLK = isCLK
self.state = False
def getIsCLK(self):
"Returns a boolean whether this is the CLK signal"
return self.isCLK
def setState(self, state):
"Set the state of this input"
self.state = state
if self.isCLK:
for olmc in self.gal.getOlmcList():
olmc.CLK(state)
for olmc in self.gal.getOlmcList():
olmc.commitCLK()
def getState(self):
"Get the state of this input"
return self.state
def getInvState(self):
"Get the inverted state of this input"
return not self.state
def getColumn(self):
"Get the Fusearray column for the Non-inverted input"
return self.column
def getInvColumn(self):
"Get the Fusearray column for the inverted input"
return self.invColumn
def getPin(self):
"Get the pin number"
return self.pin
class Gal:
"Generic-Array-Logic chip"
def __init__(self, array):
self.array = array
self.prodTermRecursionDetect = []
# The implementation must define the following objects
self.olmcs = None
self.inputs = None
def reset(self):
"Reset all state information in the chip"
for olmc in self.getOlmcList():
if olmc.getMode() == Olmc.MODE_REGISTERED:
olmc.AR()
def getArray(self):
"Returns the Fusearray"
return self.array
def arrayIndexToArrayColumn(self, index):
"Convert a Fusearray index into a Fusearray column"
return index % self.nrArrayColumns()
def getInputList(self):
"Get a list of GAL chip inputs"
return self.inputs
def __getInputAtColumn(self, column):
"""Returns a tuple (GalInput(), True|False) where [0] is the
input at the column and [1] is True for inverted and False
for Non-Inverted."""
for input in self.getInputList():
if input.getColumn() == column:
return (input, False)
if input.getInvColumn() == column:
return (input, True)
return (None, None)
def getOlmcList(self):
"Get a list of OLMCs on this GAL chip"
return self.olmcs
def __getBackpropagationAtColumn(self, column):
"""Returns a tuple (OlmcBackpropagation(), True|False) where [0] is the
OLMC-backpropagation at the column and [1] is
True for inverted and False for Non-Inverted."""
for olmc in self.getOlmcList():
bp = olmc.getBackpropagation()
if bp.getColumn() == column:
return (bp, False)
if bp.getInvColumn() == column:
return (bp, True)
return (None, None)
def __getLogicStateOfArrayIntersection(self, fuseArrayIndex):
"Get the logical state at a fuse"
if self.getArray().isBlown(fuseArrayIndex):
raise GalemuEx("Intersection resolve: Cannot resolve a blown fuse")
column = self.arrayIndexToArrayColumn(fuseArrayIndex)
(input, inverted) = self.__getInputAtColumn(column)
if input:
if inverted:
v = input.getInvState()
else:
v = input.getState()
else:
(bp, inverted) = self.__getBackpropagationAtColumn(column)
if not bp:
raise GalemuEx("Intersection resolve: Neither Input nor " +\
"Backpropagation found at column %d" % column)
if inverted:
v = bp.getInvState()
else:
v = bp.getState()
return v
def getProductTermState(self, startFuseIndex, caller):
"Get the state of an AND-product-term"
# First check if we have a recursion
if caller in self.prodTermRecursionDetect:
raise LogicEx("Product term state recursion detected at row %d"
% (startFuseIndex / self.nrArrayColumns()))
self.prodTermRecursionDetect.append(caller)
andState = False
for fuseIdx in range(startFuseIndex, startFuseIndex + self.nrArrayColumns()):
if self.getArray().isBlown(fuseIdx):
# This fuse is blown, so it doesn't affect
# the state of the AND logic
continue
v = self.__getLogicStateOfArrayIntersection(fuseIdx)
if v:
andState = True
else:
# This part of the AND equation is false.
# Set the AND equation state to false and terminate
# the evaluation of the AND equation.
andState = False
break
self.prodTermRecursionDetect.remove(caller)
return andState
def getAsyncReset(self):
"Returns the AsyncReset(...) object"
return self.asyncReset
def getSyncPreset(self):
"Returns the SyncPreset(...) object"
return self.syncPreset
class Gal22v10(Gal):
"GAL/PAL 22V10 Generic-Array-Logic chip"
idStrings = ("PAL22V10", "GAL22V10")
ARRAY_SIZE = 5828
@staticmethod
def getInputPinNumbers():
return (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13)
@staticmethod
def getOutputPinNumbers():
return (14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
@staticmethod
def getVccPinNumber():
return 24
@staticmethod
def getGndPinNumber():
return 12
@staticmethod
def getClkPinNumber():
return 1
def f2m(self, fuse):
"Convert a fuse state to an OLMC mode value"
if fuse:
return Olmc.MODE_COMBINATORIAL
return Olmc.MODE_REGISTERED
def __init__(self, array):
if len(array) != self.ARRAY_SIZE:
raise GalemuEx("Fusearray size is wrong for the GAL22V10. " +\
"Is %d, but should be %d." % (len(array), self.ARRAY_SIZE))
Gal.__init__(self, array)
# Create the GAL-input pins
self.inputs = (
GalInput(self, 1, 0, 1, isCLK = True),
GalInput(self, 2, 4, 5),
GalInput(self, 3, 8, 9),
GalInput(self, 4, 12, 13),
GalInput(self, 5, 16, 17),
GalInput(self, 6, 20, 21),
GalInput(self, 7, 24, 25),
GalInput(self, 8, 28, 29),
GalInput(self, 9, 32, 33),
GalInput(self, 10, 36, 37),
GalInput(self, 11, 40, 41),
GalInput(self, 13, 42, 43),
)
# Create the OLMC-input AND array fabric
inAndRange0 = []
for i in range(88, 396+1, 44):
inAndRange0.append(OlmcInput.AndRange(i, 44))
inAndRange1 = []
for i in range(484, 880+1, 44):
inAndRange1.append(OlmcInput.AndRange(i, 44))
inAndRange2 = []
for i in range(968, 1452+1, 44):
inAndRange2.append(OlmcInput.AndRange(i, 44))
inAndRange3 = []
for i in range(1540, 2112+1, 44):
inAndRange3.append(OlmcInput.AndRange(i, 44))
inAndRange4 = []
for i in range(2200, 2860+1, 44):
inAndRange4.append(OlmcInput.AndRange(i, 44))
inAndRange5 = []
for i in range(2948, 3608+1, 44):
inAndRange5.append(OlmcInput.AndRange(i, 44))
inAndRange6 = []
for i in range(3696, 4268+1, 44):
inAndRange6.append(OlmcInput.AndRange(i, 44))
inAndRange7 = []
for i in range(4356, 4840+1, 44):
inAndRange7.append(OlmcInput.AndRange(i, 44))
inAndRange8 = []
for i in range(4928, 5324+1, 44):
inAndRange8.append(OlmcInput.AndRange(i, 44))
inAndRange9 = []
for i in range(5412, 5720+1, 44):
inAndRange9.append(OlmcInput.AndRange(i, 44))
# Create the OLMC fabric
self.olmcs = (
Olmc(gal = self,
input = OlmcInput(inAndRange0),
output = OlmcOutput(23),
bp = OlmcBackpropagation(2, 3),
oe = OlmcOE(44, 44),
mode = self.f2m(array[5809]),
activelow = not array[5808]),
Olmc(gal = self,
input = OlmcInput(inAndRange1),
output = OlmcOutput(22),
bp = OlmcBackpropagation(6, 7),
oe = OlmcOE(440, 44),
mode = self.f2m(array[5811]),
activelow = not array[5810]),
Olmc(gal = self,
input = OlmcInput(inAndRange2),
output = OlmcOutput(21),
bp = OlmcBackpropagation(10, 11),
oe = OlmcOE(924, 44),
mode = self.f2m(array[5813]),
activelow = not array[5812]),
Olmc(gal = self,
input = OlmcInput(inAndRange3),
output = OlmcOutput(20),
bp = OlmcBackpropagation(14, 15),
oe = OlmcOE(1496, 44),
mode = self.f2m(array[5815]),
activelow = not array[5814]),
Olmc(gal = self,
input = OlmcInput(inAndRange4),
output = OlmcOutput(19),
bp = OlmcBackpropagation(18, 19),
oe = OlmcOE(2156, 44),
mode = self.f2m(array[5817]),
activelow = not array[5816]),
Olmc(gal = self,
input = OlmcInput(inAndRange5),
output = OlmcOutput(18),
bp = OlmcBackpropagation(22, 23),
oe = OlmcOE(2904, 44),
mode = self.f2m(array[5819]),
activelow = not array[5818]),
Olmc(gal = self,
input = OlmcInput(inAndRange6),
output = OlmcOutput(17),
bp = OlmcBackpropagation(26, 27),
oe = OlmcOE(3652, 44),
mode = self.f2m(array[5821]),
activelow = not array[5820]),
Olmc(gal = self,
input = OlmcInput(inAndRange7),
output = OlmcOutput(16),
bp = OlmcBackpropagation(30, 31),
oe = OlmcOE(4312, 44),
mode = self.f2m(array[5823]),
activelow = not array[5822]),
Olmc(gal = self,
input = OlmcInput(inAndRange8),
output = OlmcOutput(15),
bp = OlmcBackpropagation(34, 35),
oe = OlmcOE(4884, 44),
mode = self.f2m(array[5825]),
activelow = not array[5824]),
Olmc(gal = self,
input = OlmcInput(inAndRange9),
output = OlmcOutput(14),
bp = OlmcBackpropagation(38, 39),
oe = OlmcOE(5368, 44),
mode = self.f2m(array[5827]),
activelow = not array[5826]),
)
# Create the Reset and Preset terms
self.asyncReset = AsyncReset(self, row=0)
self.syncPreset = SyncPreset(self, row=5764/44)
def nrArrayColumns(self):
"Number of columns in the AND fuse-array"
return 44
class FuseArray:
"""A representation of the fuse array
The array contains boolean values for the blown fuses.
So an array entry of True indicates a blown fuse."""
def __init__(self):
self.reset()
def getGalType(self):
return self.type
def getArray(self):
return self.array
def __getitem__(self, index):
return self.getArray()[index]
def isBlown(self, index):
"Returns whether a fuse is blown"
return self.getArray()[index] == True
def __len__(self):
return len(self.getArray())
def reset(self):
self.array = []
self.type = ""
def readJedecFile(self, filename):
try:
data = file(filename, "r").read()
except IOError, e:
raise GalemuEx("Could not open JEDEC file %s: %s" %\
(filename, e.strerror))
self.readJedecData(data)
def readJedecData(self, data):
lines = data.splitlines()
statemachine = 0
reBitmap = re.compile(r"^L(\d+) ([01]+)*")
self.reset()
for line in lines:
if not line:
continue
if statemachine == 0:
if line[0] != '\2':
# \2 = STX = StartOfText marks the start
continue
statemachine = 1
continue
line = line.strip()
if statemachine == 1:
if len(line):
self.type = line
statemachine = 2
continue
if statemachine == 2:
m = reBitmap.match(line)
if m:
bits = m.group(2)
self.__parseBitmapString(bits)
if not self.type:
raise GalemuEx("JEDEC data does not contain the GAL type")
if not self.array:
raise GalemuEx("JEDEC data does not contain a Fusemap")
self.type = self.type.upper()
def __parseBitmapString(self, str):
for bit in str:
if bit == "0":
self.array.append(False)
elif bit == "1":
self.array.append(True)
else:
raise GalemuEx("Invalid character in JEDEC bitmap: %s" % bit)
class Emulator:
"This is the emulator that runs the GAL chip"
def __init__(self, gal):
"gal = The GalXXXX(...) chip object"
self.gal = gal
def setInput(self, input):
"input = List or tuple of input pin states"
gal = self.gal
galInputList = gal.getInputList()
if len(input) != len(galInputList):
raise GalemuEx("Emulator: setInput() wrong count of input signals. "+\
"Was: %d, Expected: %d" % (len(input), len(galInputList)))
clk = None
clkIndex = -1
for i in range(0, len(input)):
gi = galInputList[i]
if gi.getIsCLK():
# Clock last!
clk = gi
clkIndex = i
continue
gi.setState(not not input[i])
if clk:
galInputList[clkIndex].setState(not not input[clkIndex])
def getOutput(self):
"Returns a list of output pin states"
gal = self.gal
out = []
for olmc in gal.getOlmcList():
out.append(olmc.getOutputState())
# If we have an asynchronous reset, trigger it and re-evaluate
# the output states.
if gal.getAsyncReset().getState():
# Trigger
for olmc in gal.getOlmcList():
if olmc.getMode() == Olmc.MODE_REGISTERED:
olmc.AR()
# re-evaluate
out = []
for olmc in gal.getOlmcList():
out.append(olmc.getOutputState())
return out
def reset(self):
"Reset the emulator and the GAL state"
self.gal.reset()
def getGal(self):
"Returns the Gal(...) object"
return self.gal
'New "class GalXXXX" implementations need to be added to this list'
__implementedGalTypes = (
Gal22v10,
)
def selectGalClassObject(galTypeString):
"Get the GAL/PAL class object by the type string."
type = galTypeString.upper()
for g in __implementedGalTypes:
if type in g.idStrings:
return g
raise GalemuEx("GAL type %s is not supported" % galTypeString)
def main(argv):
def usage(argv):
print "Usage: %s FILE.JED INPUT_STATES..." % argv[0]
if (len(argv) < 3):
usage(argv)
return 1
jedecFile = argv[1]
inputStates = []
for i in range(2, len(argv)):
if argv[i] == "0" or argv[i].lower() == "false":
inputStates.append(False)
else:
inputStates.append(True)
a = FuseArray()
a.readJedecFile(jedecFile)
gal = selectGalClassObject(a.getGalType()) (a)
e = Emulator(gal)
e.setInput(inputStates)
out = e.getOutput()
for i in range(len(out) - 1, -1, -1):
outpin = gal.getOlmcList()[i].getOutputPin()
print "Output pin %d = %d" % (outpin.getPin(), out[i])
return 0
if __name__ == "__main__":
try:
sys.exit(main(sys.argv))
except GalemuEx, e:
print "[EXCEPTION] %s" % e.message
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