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TommyPROM
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Add support for SST27C0x0 flash chips

This commit is contained in:
Tom Nisbet 2022-12-14 16:38:28 -05:00
parent 035b3412af
commit 7d5ab86275
5 changed files with 87 additions and 60 deletions
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118
TommyPROM/PromDevice27.cpp
View File

@ -22,12 +22,13 @@ static void disableWrite() { digitalWrite(WE, HIGH);}
PromDevice27::PromDevice27(uint32_t size, E27C_PGM pgmType, unsigned long pulseWidthUsec,
unsigned writeAttempts, unsigned overwriteMultiplier)
unsigned writeAttempts, unsigned overwriteMultiplier, bool verify)
: PromDevice(size, 0, 0, false),
mPgmType(pgmType),
mPulseWidthUsec(pulseWidthUsec),
mWriteAttempts(writeAttempts),
mOverwriteMultiplier(overwriteMultiplier)
mOverwriteMultiplier(overwriteMultiplier),
mVerifyByte(verify)
{
}
@ -99,14 +100,12 @@ bool PromDevice27::burnByteWE(byte value, uint32_t address)
bool status = false;
unsigned writeCount = 0;
byte data = 0;
disableOutput();
disableWrite();
enableChip();
setAddress(address);
while (!status && (writeCount < mWriteAttempts))
{
while (!status && (writeCount < mWriteAttempts)) {
setDataBusMode(OUTPUT);
writeDataBus(value);
delayMicroseconds(1);
@ -115,15 +114,17 @@ bool PromDevice27::burnByteWE(byte value, uint32_t address)
disableWrite();
++writeCount;
setDataBusMode(INPUT);
enableOutput();
data = readDataBus();
disableOutput();
status = (readDataBus() == value);
if (mVerifyByte) {
setDataBusMode(INPUT);
enableOutput();
status = readDataBus() == value;
disableOutput();
} else {
status = true;
}
}
if (status && (mOverwriteMultiplier > 0))
{
if (status && (mOverwriteMultiplier > 0)) {
setDataBusMode(OUTPUT);
writeDataBus(value);
delayMicroseconds(1);
@ -132,8 +133,8 @@ bool PromDevice27::burnByteWE(byte value, uint32_t address)
disableWrite();
}
setDataBusMode(INPUT);
disableChip();
return status;
}
@ -151,14 +152,12 @@ bool PromDevice27::burnByteCE(byte value, uint32_t address)
bool status = false;
unsigned writeCount = 0;
byte data = 0;
disableOutput();
disableWrite();
disableChip();
setAddress(address);
while (!status && (writeCount < mWriteAttempts))
{
while (!status && (writeCount < mWriteAttempts)) {
setDataBusMode(OUTPUT);
writeDataBus(value);
delayMicroseconds(2);
@ -168,24 +167,24 @@ bool PromDevice27::burnByteCE(byte value, uint32_t address)
delayMicroseconds(2);
++writeCount;
setDataBusMode(INPUT);
enableOutput();
data = readDataBus();
disableOutput();
status = (readDataBus() == value);
if (mVerifyByte) {
setDataBusMode(INPUT);
enableOutput();
status = readDataBus() == value;
disableOutput();
}
}
setDataBusMode(INPUT);
disableChip();
return status;
}
ERET PromDevice27::erase(uint32_t start, uint32_t end)
{
if (mPgmType != E27C_PGM_CE) return RET_NOT_SUPPORT;
ERET status = RET_FAIL;
// Erase code for the 27E257 and 27C257. The Vpp and A9 pins are held at 14V for the
// erase and verify cycle. This erases the entire chip, so the start and end address
// parameters are ignored.
disableChip();
disableOutput();
setAddress(0);
@ -193,30 +192,46 @@ ERET PromDevice27::erase(uint32_t start, uint32_t end)
writeDataBus(0xff);
delayMicroseconds(2);
unsigned writeCount = 0;
ERET status = RET_FAIL;
while ((status == RET_FAIL) && (writeCount < mWriteAttempts)) {
setAddress(0);
setDataBusMode(OUTPUT);
writeDataBus(0xff);
delayMicroseconds(2);
enableChip();
delay(100);
disableChip();
delayMicroseconds(2);
if (mPgmType == E27C_PGM_WE) {
// Erase code for the SST27C0x0. The Vpp and A9 pins are held at 12V for the
// erase cycle. This erases the entire chip, so the start and end address
// parameters are ignored. There is no erase verification for this chip.
enableChip();
delayMicroseconds(1);
enableWrite();
delayMicroseconds(100); // Hard coded for SST27F020
disableWrite();
disableChip();
setDataBusMode(INPUT);
status = RET_OK;
} else {
// Erase code for the 27E257 and 27C257. The Vpp and A9 pins are held at 14V for
// the erase and verify cycle. This erases the entire chip, so the start and end
// address parameters are ignored.
unsigned writeCount = 0;
while ((status == RET_FAIL) && (writeCount < mWriteAttempts)) {
setAddress(0);
setDataBusMode(OUTPUT);
writeDataBus(0xff);
delayMicroseconds(2);
enableChip();
delay(100);
disableChip();
delayMicroseconds(2);
// Read back the data to verify all cells are erased. Note That this is done
// while CE is HIGH. This is the erase verify mode.
setDataBusMode(INPUT);
for (uint32_t address = 0; (address < mSize); address++) {
setAddress(address);
enableOutput();
uint8_t b = readDataBus();
disableOutput();
if (b != 0xff) break;
}
status = RET_OK;
}
// Read back the data to verify all cells are erased. Note That this is done
// while CE is HIGH. This is the erase verify mode.
setDataBusMode(INPUT);
for (uint32_t address = 0; (address < mSize); address++) {
setAddress(address);
enableOutput();
uint8_t b = readDataBus();
disableOutput();
if (b != 0xff) break;
}
status = RET_OK;
}
}
return status;
}
@ -224,15 +239,12 @@ ERET PromDevice27::erase(uint32_t start, uint32_t end)
void PromDevice27::myDelay(unsigned int us)
{
if (us > 16000)
{
if (us > 16000) {
// The delayMicroseconds code can't do delays longer than 16ms, so use the
// ms delay code for larger values. This rounds down to the nearest ms, so
// it is not possible to delay for 40.5 ms, for example.
delay(us / 1000);
}
else
{
} else {
delayMicroseconds((unsigned int) us);
}
}

3
TommyPROM/PromDevice27.h
View File

@ -36,7 +36,7 @@ class PromDevice27 : public PromDevice
{
public:
PromDevice27(uint32_t size, E27C_PGM pgmType, unsigned long pulseWidthUsec,
unsigned writeAttempts, unsigned overwriteMultiplier);
unsigned writeAttempts, unsigned overwriteMultiplier, bool verify=true);
void begin();
const char * getName() { return "27 series EPROM"; }
ERET erase(uint32_t start, uint32_t end);
@ -54,6 +54,7 @@ class PromDevice27 : public PromDevice
unsigned long mPulseWidthUsec;
unsigned mWriteAttempts;
unsigned mOverwriteMultiplier;
bool mVerifyByte;
};
#endif // #define INCLUDE_PROM_DEVICE_27_H

2
TommyPROM/PromDevice28C.cpp
View File

@ -189,7 +189,7 @@ bool PromDevice28C::waitForWriteCycleEnd(byte lastValue)
byte b1=0, b2=0;
setDataBusMode(INPUT);
delayMicroseconds(1);
for (int readCount = 1; (readCount < (mMaxWriteTime * 100)); readCount++)
for (unsigned readCount = 1; (readCount < (mMaxWriteTime * 100)); readCount++)
{
enableChip();
enableOutput();

8
TommyPROM/TommyPROM.ino
View File

@ -19,7 +19,7 @@
#include "XModem.h"
static const char * MY_VERSION = "3.2";
static const char * MY_VERSION = "3.3";
// Global status
@ -44,11 +44,13 @@ PromDevice28C prom(32 * 1024L, 64, 10, true);
// 1000us (1ms) write pulse
// 15 write attempts
// 4x overwrite pulse
// (true) verify data byte after writing
//PromDevice27 prom(8 * 1024L, E27C_PGM_WE, 1000L, 15, 4); // 2764 with SEEQ intelligent programming
//PromDevice27 prom(32 * 1024L, E27C_PGM_WE, 1000L, 25, 3); // 27C256 with SEEQ intelligent programming
//PromDevice27 prom(2 * 1024L, E27C_PGM_WE, 50000L, 1, 0); // 2716 with single 50ms write
//PromDevice27 prom(64 * 1024L, E27C_PGM_WE, 100L, 11, 0); // 27C040 with Atmel rapid programming
PromDevice27 prom(32 * 1024L, E27C_PGM_CE, 100L, 25, 0); // 27C257/27E257 with 100uS program pulse on CE
//PromDevice27 prom(512 * 1024L, E27C_PGM_WE, 100L, 11, 0); // 27C040 with Atmel rapid programming
//PromDevice27 prom(32 * 1024L, E27C_PGM_CE, 100L, 25, 0); // 27C257/27E257 with 100uS program pulse on CE
PromDevice27 prom(256 * 1024L, E27C_PGM_WE, 20L, 1, 0, false); // SST27SF020 with single 20us write, no verify
#elif defined(PROM_IS_SST39SF)
// Define a device for anSST39SF Flash with the following parameters:

16
docs/prom-families.md
View File

@ -161,7 +161,8 @@ The 8755 build of TommyPROM also has a circuit to control the 25V programming pu
|:--- |:--- |:--- |:--- |:--- |
|AT28C256 |Atmel, others|EEPROM |28C |Fully supported|
|SST39SF040|Microchip |Flash |SST39SF|All SST39SF0x0 supported|
|SST28SF040|SST |Flash | |All SST28SF0x0 supported|
|SST28SF040|SST |Flash |SST39SF|All SST28SF0x0 supported|
|SST27SF020|SST |Flash |27 |12V continuous for pgm/erase|
|WE27C257 |Winbond |EEPROM |27 |Continual 12V or 14V for program/erase|
|AT29C010 |Atmel |Flash |28C |Only with 128 byte or less sector size|
|8755A |Intel |EPROM |8755A |Requires 25V pulses to program|
@ -195,6 +196,18 @@ This is an earlier version of the SST39SF series chips. They are pin compatible
flash chips support software data protection. The _Lock_ and _Unlock_ commands can be
used to enable and disable SDP from the command line.
#### SST27SF020
The Silicon Storage SST27SF0x0 are programmed similarly to the 27C257 in that a constant
voltage is applied for program and erase operations. Unlike the 27C257, these have a
dedicated WE pin that controls programming and erasing. Another difference is that they
do not have a verify operation to read back the programmed data.
These Flash chips have a _VPP_ pin that needs a constant 12V during programming. Unlike
the newer 28C EEPROMs, these chips do not automatically erase before writing to a
location. Instead, the entire chip is erased by applying 12V to _VPP_ and _A9_ and then
pulsing _WE_.
#### 27C257
The Winbond WE27C257 and WE27E257 appear to be identical 32Kx8 EEPROMs. The 27C version
@ -228,4 +241,3 @@ for chips with the 256 byte buffer.
|Model |Manufacturer |Type |Module |Notes|
|:--- |:--- |:--- |:--- |:--- |
|M27C4001 |ST Micro |EEPROM | |VCC=6.5V, VPP=12.75V to pgm|
|SST27SF020|SST |Flash | |12V continuous for pgm/erase|