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68 lines
3.1 KiB
Markdown
68 lines
3.1 KiB
Markdown
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---
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title: Chips Supported
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permalink: /docs/prom-specific-code
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exerpt: "PROM types supported by TommyPROM - EPROM, EEPROM, Flash"
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---
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TommyPROM can be used to read and write many different types of EEPROM, Flash, and EPROM
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chips. Due to differences in the technologies of these chips, some features of TommyPROM
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may work differently or may not be applicable at all. The standard code can read most
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types of PROM, even if there is no specific software support for them.
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Broadly speaking, there are two different ways to write to chips. The first method is
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similar to a static RAM - the WE signal is asserted and data is written to a location
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using the data and address lines. This is the case for the 28C64. Some of these chips,
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like the 27C257, need a programming voltage to be present on the Vpp or PGM pin. There
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are usually timing requirements for the program pulse and there may be repeated write
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cycles needed with a verification cycle to complete the write.
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The second method is the use of a program command register. Bytes are written to a single
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location by sending a command string, which is a series of chip writes. These chips
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usually have additional commands to erase sectors or to lock and unlock the chip. The
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SST39SF010 is an example of a chip that uses a command register.
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Some chips use a combination of both methods. The 28C256 uses a command register to
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enable and disable Software Data Protection, but uses a direct write for programming.
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TommyPROM has a variety of PromDevice Modules that can be compiled in to support these
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different chip technologies.
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## Suported Chips
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|Module |Manufacturer |Type |Notes|
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|:--- |:--- |:--- |:--- |
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|28C |Atmel, others|EEPROM |28C256, 28C64, 28C16, 29C040 (Flash)|
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|SST |Microchip |Flash |SST39SF040 (all SST39SF0x0), SST28SF040|
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|27 |many |EPROM |variety of 27xx and 27Cxx EPROM, Flash, and EEPROMs|
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|2316 |many |ROM |read-only 2316, 2332, 2364, 23128, 23256|
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|8755A |Intel |EPROM |8755A EPROM and read-only 8355|
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## PromDevice Modules
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This PromDevice28C module is enabled by default to program 28C256 EEPROMS. To use a
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different module, make the following edits:
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* In configure.h, comment out the #define PROM_IS_28C line
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* Uncomment one of the other PROM_IS_ lines to compile a different module
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* In TommyPROM.ino, uncomment or add a new PromDevice declaration for the specific chip
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## Chip Manufacturers
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|Name |Code |Notes|
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|:--- |:---|:---|
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|AMS - Advanced Memory Systems|AMS |Merged with Intersil|
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|AMD - Advanced Micro Devices |AM ||
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|Atmel |AT |Aquired by Microchip|
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|CSI - Catalyst Semiconductor |CAT |Aquired by ON Semiconductor|
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|Fujitsu |MBM ||
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|Intel |i ||
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|Mitsubishi |M5L ||
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|Motorola |MCM ||
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|Seeq Technology | |Aquired by LSI Logic|
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|SST - Silicon Storage Tech |ST |Aquired by Microchip|
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|ST Microelectronics |M ||
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|Texas Instruments |TMS ||
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|Winbond |W ||
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|Xicor |X ||
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