1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
|
"""
# TOP2049 Open Source programming suite
#
# Generic SRAM chip
#
# Copyright (c) 2011 Michael Buesch <m@bues.ch>
#
# 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, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
"""
from libtoprammer.chip import *
class Chip_genericSRAM(Chip):
def __init__(self, chipPackage, chipPinVCC, chipPinGND,
VCCVoltage,
nrAddressBits, nrDataBits):
Chip.__init__(self,
chipPackage = chipPackage,
chipPinVCC = chipPinVCC,
chipPinGND = chipPinGND)
self.VCCVoltage = VCCVoltage
self.nrAddressBits = nrAddressBits
self.nrAddressBytes = int(math.ceil((float(self.nrAddressBits) - 0.1) / 8))
self.nrDataBits = nrDataBits
assert(nrDataBits == 8)
def erase(self):
self.writeRAM(int2byte(0) * self.__sizeBytes())
def test(self):
generic = GenericAlgorithms(self)
generic.simpleTest(self.readRAM, self.writeRAM,
self.__sizeBytes())
def readRAM(self):
image = []
self.progressMeterInit("Reading SRAM", self.__sizeBytes())
self.__turnOnChip()
self.__setControlPins(CE=0, OE=0, WE=1)
nrBytes = 0
for addr in range(0, self.__sizeBytes()):
self.progressMeter(addr)
self.__setAddress(addr)
self.__readData()
nrBytes += 1
if nrBytes == self.top.getBufferRegSize():
image.append(self.top.cmdReadBufferReg(nrBytes))
nrBytes = 0
image.append(self.top.cmdReadBufferReg(nrBytes))
self.__setControlPins(CE=1, OE=1, WE=1)
self.progressMeterFinish()
return b"".join(image)
def writeRAM(self, image):
if len(image) > self.__sizeBytes():
self.throwError("Invalid memory image size %d (expected max %d)" %\
(len(image), self.__sizeBytes()))
self.progressMeterInit("Writing SRAM", self.__sizeBytes())
self.__turnOnChip()
self.__setControlPins(CE=0, OE=1, WE=1)
for addr in range(0, len(image)):
self.progressMeter(addr)
self.__setAddress(addr)
self.__writeData(image[addr])
self.__setControlPins(CE=0, OE=1, WE=0)
self.top.cmdDelay(0.00000007) # Delay at least 70 nsec
self.__setControlPins(CE=0, OE=1, WE=1)
self.__setControlPins(CE=1, OE=1, WE=1)
self.progressMeterFinish()
def __sizeBytes(self):
return (1 << self.nrAddressBits)
def __turnOnChip(self):
self.__setControlPins(CE=1, OE=1, WE=1)
self.top.cmdSetVCCVoltage(self.VCCVoltage)
self.applyGND(True)
self.applyVCC(True)
self.lastAddress = None
def __setControlPins(self, CE=1, OE=1, WE=1):
value = 0
if CE:
value |= 1
if OE:
value |= 2
if WE:
value |= 4
self.top.cmdFPGAWrite(0x11, value)
def __writeData(self, data):
data = byte2int(data)
self.top.cmdFPGAWrite(0x10, data)
def __readData(self):
self.top.cmdFPGARead(0x10)
def __setAddress(self, addr):
for i in range(0, self.nrAddressBytes):
shift = 8 * i
mask = 0xFF << shift
if self.lastAddress is None or\
(self.lastAddress & mask) != (addr & mask):
self.top.cmdFPGAWrite(0x12 + i,
(addr & mask) >> shift)
self.lastAddress = addr
|
