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Opsis EEPROM IC
The Opsis board has a Microchip 24AA02E48 2048 kbit EEPROM connected to both the FX2 and the FPGA.
The Microchip EEPROM has the following;
- 2K bits == 2048 bits == 256 bytes
- 0x00 - 0x80 [0->128) == User space
- 0x80 - 0xFF [128->255] == Write-Protected Node Address Block
Opsis EEPROM Layout
| Hex Address |
Decimal Addr |
Size (bytes) |
Description |
| 0x00 - 0x07 |
0 -> 7 |
8 bytes |
FX2 Configuration |
| 0x08 - 0x7E |
??? -> ??? |
??? bytes |
Stage 2 bootloader |
| 0x?? - 0x?? |
??? -> ??? |
??? bytes |
OPSIS Board Information. Format a modified version of the TOFE EEPROM format |
| 0x7F |
127 |
1 byte |
EEPROM Content Checksum |
| 0x80 - 0xF7 |
128 -> 247 |
120 bytes |
Write protected empty |
| 0xF8 - 0xFF |
248 -> 255 |
8 bytes |
Unique Identifier (MAC Address) |
Opsis EEPROM Content
FX2 Configuration
| Hex Address |
Value |
Description |
| 0x00 |
0xC0 |
FX2 'C2 Load' Format specifier |
| 0x01 |
0x19 |
FX2 Vendor ID (Lower bits) 0x2A19 |
| 0x02 |
0x2A |
FX2 Vendor ID (Higher bits) |
| 0x03 |
0x40 |
FX2 Product ID (Lower bits) 0x5440 |
| 0x04 |
0x54 |
FX2 Product ID (Higher bits) |
| 0x05 |
See Docs |
FX2 Device ID (Lower bits) |
| 0x06 |
See Docs |
FX2 Device ID (Higher bits) |
| 0x07 |
0x00 |
FX2 Configuration Byte, Bit 7 - 0 == Enter high speed mode, Bit 6 - 0 == Come up connected, Bit 0 - 0 == 100 kHz I2C Mode |
FIXME: Outdated!
| Hex Address |
Decimal Address |
Value |
Description |
| 0x09 - 0x0D |
9 -> 13 (6 bytes) |
OPSIS - 0x4f, 0x50, 0x53, 0x49, 0x53 |
OPSIS Config format identifier |
| 0x0E |
14 |
0x01 |
TOFE Config format version, 8 bit, Little Endian |
| 0x0F |
15 |
|
Number of atoms in EEPROM |
| 0x10 |
16 |
|
CRC-8 of complete data (including header), skipping the crc8 field. |
|
(4 bytes) |
|
Size of the data section which follows (including footer) |
| XXX |
X bytes |
|
TOFE Compatible Atoms |
| XXX |
(5 bytes) |
SISPO - 0x53, 0x49, 0x53, 0x50, 0x4f |
|
| XXX - 0x7E |
XXXX |
0x00, ..., 0x00 |
Padding for remaining area |
| 0x7F |
127 (1 byte) |
|
CRC8 checksum of EEPROM contents from, 0x00 -> 0x7E and 0x80 -> 0xFF (IE Entire EEPROM contents excluding checksum itself) |
Microchip EEPROM Read Only Section
| Hex Address |
Decimal Address |
Value |
Description |
| 0x80 - 0xF7 |
128 -> 247 |
0xFF |
Write protected empty |
| 0xF8 - 0xFF |
248 -> 255 |
|
Unique Identifier |
