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add prom-specific doc page

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Tom Nisbet 2023-09-17 22:42:52 -04:00
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docs/_docs/design-250-prom-specific-code.md
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@ -9,7 +9,19 @@ differences in the technologies of these chips, some features of TommyPROM may w
differently or may not be applicable at all. The standard code can read most types of differently or may not be applicable at all. The standard code can read most types of
PROM, even if there is no specific software support for them. PROM, even if there is no specific software support for them.
# PromDevice Drivers # Verified Chips
|Model |Manufacturer |Type |Module |Notes|
|:--- |:--- |:--- |:--- |:--- |
|AT28C256 |Atmel, others|EEPROM |28C |Fully supported|
|SST39SF040|Microchip |Flash |SST39SF|All SST39SF0x0 supported|
|SST28SF040|SST |Flash |SST28SF|All SST28SF0x0 supported|
|SST27SF020|SST |Flash |27 |12V continuous for pgm/erase|
|W27C257 |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|
# PromDevice Modules
## PromDevice28C ## PromDevice28C
@ -54,7 +66,7 @@ to that sector.
All programming and erase operations for the 39SF chips require only a single 5V power supply. All programming and erase operations for the 39SF chips require only a single 5V power supply.
## PromDeviceSST39SF ## PromDeviceSST28SF
The SST28SF0x0 SuperFlash chips are an earlier version of the 39SF chips, using 256-byte The SST28SF0x0 SuperFlash chips are an earlier version of the 39SF chips, using 256-byte
sectors. The 28SF and 39SF chips are pin compatible, but use different command sets for sectors. The 28SF and 39SF chips are pin compatible, but use different command sets for
@ -82,17 +94,6 @@ need for shift registers to create address lines.
The 8755 build of TommyPROM also has a circuit to control the 25V programming pulses. The 8755 build of TommyPROM also has a circuit to control the 25V programming pulses.
# Verified Chips
|Model |Manufacturer |Type |Module |Notes|
|:--- |:--- |:--- |:--- |:--- |
|AT28C256 |Atmel, others|EEPROM |28C |Fully supported|
|SST39SF040|Microchip |Flash |SST39SF|All SST39SF0x0 supported|
|SST28SF040|SST |Flash |SST28SF|All SST28SF0x0 supported|
|SST27SF020|SST |Flash |27 |12V continuous for pgm/erase|
|W27C257 |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|
# Misc Flash # Misc Flash