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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
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
@ -54,7 +66,7 @@ to that sector.
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
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.
# 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