3.1 KiB
| title | permalink | exerpt |
|---|---|---|
| Chips Supported | /docs/prom-specific-code | PROM types supported by TommyPROM - EPROM, EEPROM, Flash |
TommyPROM can be used to read and write many different types of EEPROM, Flash, and EPROM chips. Due to differences in the technologies of these chips, some features of TommyPROM may work 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.
Broadly speaking, there are two different ways to write to chips. The first method is similar to a static RAM - the WE signal is asserted and data is written to a location using the data and address lines. This is the case for the 28C64. Some of these chips, like the 27C257, need a programming voltage to be present on the Vpp or PGM pin. There are usually timing requirements for the program pulse and there may be repeated write cycles needed with a verification cycle to complete the write.
The second method is the use of a program command register. Bytes are written to a single location by sending a command string, which is a series of chip writes. These chips usually have additional commands to erase sectors or to lock and unlock the chip. The SST39SF010 is an example of a chip that uses a command register.
Some chips use a combination of both methods. The 28C256 uses a command register to enable and disable Software Data Protection, but uses a direct write for programming.
TommyPROM has a variety of PromDevice Modules that can be compiled in to support these different chip technologies. Only one PromDevice module can be compiled into a build.
Suported Chips
| Module | Manufacturer | Type | Notes |
|---|---|---|---|
| 28C | Atmel, others | EEPROM | 28C256, 28C64, 28C16, 29C040 (Flash) |
| SST | Microchip | Flash | SST39SF040 (all SST39SF0x0), SST28SF040 |
| 27 | many | EPROM | variety of 27xx and 27Cxx EPROM, Flash, and EEPROMs |
| 2316 | many | ROM | read-only 2316, 2332, 2364, 23128, 23256 |
| 8755A | Intel | EPROM | 8755A EPROM and read-only 8355 |
PromDevice Modules
This PromDevice28C module is enabled by default to program 28C256 EEPROMS. To use a different module, make the following edits:
- In configure.h, comment out the #define PROM_IS_28C line
- Uncomment one of the other PROM_IS_ lines to compile a different module
- In TommyPROM.ino, uncomment or add a new PromDevice declaration for the specific chip
Chip Manufacturers
| Name | Code | Notes |
|---|---|---|
| AMS - Advanced Memory Systems | AMS | Merged with Intersil |
| AMD - Advanced Micro Devices | AM | |
| Atmel | AT | Aquired by Microchip |
| CSI - Catalyst Semiconductor | CAT | Aquired by ON Semiconductor |
| Fujitsu | MBM | |
| Intel | i | |
| Mitsubishi | M5L | |
| Motorola | MCM | |
| Seeq Technology | Aquired by LSI Logic | |
| SST - Silicon Storage Tech | ST | Aquired by Microchip |
| ST Microelectronics | M | |
| Texas Instruments | TMS | |
| Winbond | W | |
| Xicor | X |