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update chip driver docs
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Tom Nisbet
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@ -27,19 +27,21 @@ enable and disable Software Data Protection, but uses a direct write for program
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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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# Verified Chips
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|Model |Manufacturer |Type |Module |Notes|
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|:--- |:--- |:--- |:--- |:--- |
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|AT28C256 |Atmel, others|EEPROM |28C |Fully supported|
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|AT28C64 |Atmel, others|EEPROM |28C |Fully supported|
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|AT29C010 |Atmel |Flash |28C |Only with 128 byte or less sector size|
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|SST39SF040|Microchip |Flash |SST39SF|All SST39SF0x0 supported|
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|SST28SF040|SST |Flash |SST28SF|All SST28SF0x0 supported|
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|SST27SF020|SST |Flash |27 |12V continuous for pgm/erase|
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|W27C257 |Winbond |EEPROM |27 |Continual 12V or 14V for program/erase|
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|AT29C010 |Atmel |Flash |28C |Only with 128 byte or less sector size|
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|W27C257 |Winbond |EEPROM |27 |Continuous 12V or 14V for program/erase|
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|8755A |Intel |EPROM |8755A |Requires 25V pulses to program|
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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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@ -57,27 +59,15 @@ commands to enable and disable the [Software Data protection (SDP)](28C256-notes
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features of 28C chips. There is also support for the fast block write mode of these
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chips, allowing a 32KB chip to be programmed in just a few seconds.
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## PromDevice27
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The 27C EPROMs use a variety of programming algorithms. Code exists for some of these,
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but very few of the chips have been tested.
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Most, if not all, 27C series chips are not 5V only and require a higher voltage to program
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them. Some need the voltage constantly applied while programming and others use high
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voltage pulses for each byte. For constant voltage chips, it is probably easiest to just
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add an external power supply and manually assert the voltage before starting a write. For
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those with switched voltages, some elements of the 8755 hardware may be leveraged to build
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a version of the programmer that supports these chips.
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## PromDeviceSST39SF
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The SST39SF0x0 NOR Flash chips use fixed 4KB sectors that must be manually erased before a new program
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operation, but the code manages this transparently. Whenever a write is started to a new
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segment, the driver first initiates an erase of that sector. A second write to the same
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sector will not cause an erase, so it is possible to write to a segment multiple times
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with no additional steps as long as the writes are to different parts of the sector. For
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example, 256 bytes could be written to the start of a sector from one file and then 512
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bytes could be written to the end of the sector from another file.
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The SST39SF0x0 NOR Flash chips use fixed 4KB sectors that must be manually erased before a
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new program operation, but the code manages this transparently. Whenever a write is
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started to a new segment, the driver first initiates an erase of that sector. A second
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write to the same sector will not cause an erase, so it is possible to write to a segment
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multiple times with no additional steps as long as the writes are to different parts of
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the sector. For example, 256 bytes could be written to the start of a sector from one
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file and then 512 bytes could be written to the end of the sector from another file.
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Writing data that spans multiple sectors also works with no additional steps. When
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a sector boundary is crossed, the new sector is erased and set as the current sector.
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@ -97,6 +87,24 @@ the 28SF are slower.
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All programming and erase operations for the 28SF chips require only a single 5V power supply.
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## PromDevice27
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The 27C supports Flash, EEPROM, and EPROM chips that use a variety of programming algorithms.
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Most, if not all, 27C series chips are not 5V-only and require a higher voltage to program
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or erase. This driver supports chips that need the voltage constantly applied while
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programming or erasing. The programming voltages are provided by an external power supply
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and manually switched before starting a write or erase operation. See the [TommyPROM32
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hardware](pcb#TommyPROM32) for a diode circuit that allows the programming voltage to be
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switched between Vcc and a higher voltage.
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Check the [Chip Details](#27c-and-27e-series-eproms-and-flash) for the high voltage
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connections for a particular chip or consult your data sheet.
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Chips that use high voltage pulses for each byte are not supported. For those chips, some
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elements of the [8755A hardware](8755A-hardware) may be leveraged to build a version of
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the programmer that is able to provide high voltage pulses.
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## PromDevice8755
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TommyPROM has a driver for Intel 8755 EPROMs. This driver replaces the 28C driver at
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@ -117,7 +125,6 @@ need for shift registers to create address lines.
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The 8755 build of TommyPROM also has a circuit to control the 25V programming pulses.
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# Chip Details
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## 28C Series 28C256
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@ -149,6 +156,32 @@ This is an earlier version of the SST39SF series chips. They are pin compatible
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flash chips support software data protection. The _Lock_ and _Unlock_ commands can be
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used to enable and disable SDP from the command line.
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## 27C and 27E Series EPROMs and Flash
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### W27C257 and W27C512
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The Winbond W27C257 and W27E257 appear to be identical 32Kx8 EEPROMs. The 27C version
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has been tested. The Winbond W27C512 is a 64Kx8 EEPROM with no dedicated _VPP_ pin.
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The 257 EEPROMs have a _VPP_ pin that needs a constant 12V during programming. Unlike the
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newer 28C EEPROMs, these chips do not automatically erase before writing to a location.
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Instead, the entire chip is erased by applying 14V to _VPP_ and _A9_ and then pulsing
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_CE_.
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Unlike the 257 chips, the W27C512 does not have a dedicated pin for the programming
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voltage and instead uses the OE pin to place the chip in programming mode. The verify
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operation requires that the OE pin be switched to _LOW_ and there is no hardware support
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for this, so the current code supports the 512 chip by doing a single write cycle with no
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verify.
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Because the chips use a constant high voltage for programming instead of a pulse, an
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external power supply and two diodes can be used to supply either 5V or 12V to the
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pins for programming and erasing.
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Note that the W27x257 chip are almost a drop-in replacement for the 28C256. The _WE_,
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_VPP_, and _A14_ pins are the only differences. For reading, the _VPP_ pin should be
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connected to 5V.
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## 29C Series
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The 29C0x0 chips are 5V sectored flash chips. They are similar to the 28C EEPROMs,
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@ -187,7 +220,6 @@ data. Data is written a byte at a time using a command register to control the
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programming. TommyPROM does not currently support 29F chips, but it would not be
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difficult to write a driver. The default 28C driver will read 29F chips.
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## SST27SF020
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The Silicon Storage SST27SF0x0 are programmed similarly to the 27C257 in that a constant
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@ -200,31 +232,6 @@ the newer 28C EEPROMs, these chips do not automatically erase before writing to
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location. Instead, the entire chip is erased by applying 12V to _VPP_ and _A9_ and then
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pulsing _WE_.
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## 27C and 27E Series EPROMs and flash
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#### W27C257 and W27C512
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The Winbond W27C257 and W27E257 appear to be identical 32Kx8 EEPROMs. The 27C version
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has been tested. The Winbond W27C512 is a 64Kx8 EEPROM with no dedicated _VPP_ pin.
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The 257 EEPROMs have a _VPP_ pin that needs a constant 12V during programming. Unlike the
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newer 28C EEPROMs, these chips do not automatically erase before writing to a location.
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Instead, the entire chip is erased by applying 14V to _VPP_ and _A9_ and then pulsing
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_CE_.
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Unlike the 257 chips, the W27C512 does not have a dedicated pin for the programming
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voltage and instead uses the OE pin to place the chip in programming mode. The verify
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operation requires that the OE pin be switched to _LOW_ and there is no hardware support
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for this, so the current code supports the 512 chip by doing a single write cycle with no
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verify.
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Because the chips use a constant high voltage for programming instead of a pulse, an
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external power supply and two diodes can be used to supply either 5V or 12V to the
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pins for programming and erasing.
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Note that the W27x257 chip are almost a drop-in replacement for the 28C256. The _WE_,
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_VPP_, and _A14_ pins are the only differences. For reading, the _VPP_ pin should be
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connected to 5V.
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# Chips to be Tested
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@ -234,7 +241,8 @@ connected to 5V.
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|W27C512 |Winbond |EEPROM |27 |Continual 12V or 14V for program/erase,VPP on OE|
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|AM28F512 |AMD |EEPROM | ||
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|AM29F040 |AMD |EEPROM | ||
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|AMS29AF010| | | ||
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|AMS29AF010|AMS | | ||
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# Chip Manufacturers
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