| | 1 | Here we try to document what we know about the EEPROM Structure. |
| | 2 | |
| | 3 | Even with a 93xx66 EEPROM, at maximum 256 Bytes are used |
| | 4 | |
| | 5 | All important things happen in the first |
| | 6 | 0x14(FT232/245), 0x16(FT2232CD), 0x18(FT232/245R) or 0x1a (FT2232H/4432H) bytes |
| | 7 | |
| | 8 | Type | Use extra EEPROM space |
| | 9 | FT2XXB | No |
| | 10 | |
| | 11 | Byte.BIT| TYPE_AM TYPE_BM TYPE_2232C TYPE_R TYPE_2232H TYPE_4232H |
| | 12 | 00.0 | 0 0 channel_a_type channel_a_type 0 |
| | 13 | 00.1 | 0 0 channel_a_type channel_a_type 0 |
| | 14 | 00.2 | 0 0 channel_a_type high_current channel_a_type 0 |
| | 15 | 00.3 | 0 0 channel_a_driver channel_a_driver channel_a_driver channel_a_driver |
| | 16 | 00.4 | 0 0 high_current_a 0 0 0 |
| | 17 | 00.5 | 0 0 0 0 0 0 |
| | 18 | 00.6 | 0 0 0 0 0 0 |
| | 19 | 00.7 | 0 0 0 0 SUSPEND_DBUS7 channel_c_driver |
| | 20 | |
| | 21 | On TYPE_R 00.3 set mean D2XX, on other devices VCP |
| | 22 | |
| | 23 | 01.0 | 0 0 channel_b_type channel_b_type 0 |
| | 24 | 01.1 | 0 0 channel_b_type channel_b_type 0 |
| | 25 | 01.2 | 0 0 channel_b_type 0 channel_b_type 0 |
| | 26 | 01.3 | 0 0 channel_b_driver 0 channel_b_driver channel_b_driver |
| | 27 | 01.4 | 0 0 high_current_b 0 0 0 |
| | 28 | 01.5 | 0 0 0 0 0 0 |
| | 29 | 01.6 | 0 0 0 0 0 |
| | 30 | 01.7 | 0 0 0 0 0 channel_d_driver |
| | 31 | |
| | 32 | Fixme: Missing 4232H validation |
| | 33 | |
| | 34 | 02 | Vendor ID (VID) LSB (all) |
| | 35 | 03 | Vendor ID (VID) MSB (all) |
| | 36 | 04 | Product ID (PID) LSB (all) |
| | 37 | 05 | Product ID (PID) MSB (all) |
| | 38 | 06 | Device release number LSB (not tested on TYPE_4232H) |
| | 39 | 07 | Device release number MSB (not tested on TYPE_4232H) |
| | 40 | | |
| | 41 | 08.4 | Battery powered |
| | 42 | 08.5 | Remote wakeup |
| | 43 | 08.6 | Self powered: 1, bus powered: 0 |
| | 44 | 08.7 | Always 1 |
| | 45 | | |
| | 46 | 09 | Max power (mA/2) |
| | 47 | | |
| | 48 | Byte.BIT| TYPE_AM TYPE_BM TYPE_2232C TYPE_R TYPE_2232H TYPE_4232H |
| | 49 | 0a.0 | 0 IsoIn IsoIn part A 0 0 0 |
| | 50 | 0a.1 | 0 IsoOut IsoOut part A 0 0 0 |
| | 51 | 0a.2 | 0 suspend_pull_down suspend_pull_down suspend_pull_down suspend_pull_down |
| | 52 | 0a.3 | 0 use_serial use_serial use_serial |
| | 53 | 0a.4 | 0 change_usb_version change_usb_version |
| | 54 | 0a.5 | 0 0 IsoIn part B 0 0 0 |
| | 55 | 0a.6 | 0 0 IsoOut part B 0 0 0 |
| | 56 | 0a.7 | 0 - reserved |
| | 57 | |
| | 58 | 0b | TYPE_R Bitmask Invert, 0 else |
| | 59 | Byte.BIT| TYPE_4232H |
| | 60 | 0b.4 | channel_a_rs485enable |
| | 61 | 0b.5 | channel_b_rs485enable |
| | 62 | 0b.6 | channel_c_rs485enable |
| | 63 | 0b.7 | channel_d_rs485enable |
| | 64 | |
| | 65 | Byte | TYPE_AM TYPE_BM TYPE_2232C TYPE_R TYPE_2232H TYPE_4232H |
| | 66 | 0c | 0 USB-VER-LSB USB-VER-LSB 0 ? ? |
| | 67 | 0d | 0 USB-VER-MSB USB-VER-MSB 0 ? ? |
| | 68 | (On several FT2232H different values were observed -> The value is unused |
| | 69 | if change USB version is not set, so it might contain garbage) |
| | 70 | |
| | 71 | 0e | OFFSET Vendor |
| | 72 | 0f | Len VENDOR |
| | 73 | |
| | 74 | 10 | Offset Product |
| | 75 | 11 | Length Product |
| | 76 | |
| | 77 | 12 | Offset Serial |
| | 78 | 13 | Length Serial |
| | 79 | |
| | 80 | Byte.BIT| TYPE_AM TYPE_BM TYPE_2232C TYPE_R TYPE_2232H TYPE_4232H |
| | 81 | 14.3:0 | UA UA CHIP CBUS[0] AL A |
| | 82 | 14.7:0 | UA UA CHIP CBUS[1] AH B |
| | 83 | 15.3:0 | UA UA 0 CBUS[2] BL C |
| | 84 | 15.7:0 | UA UA 0 CBUS[3] BH D |
| | 85 | 16.3:0 | UA UA UA CBUS[4] 0 0 |
| | 86 | 16.7:0 | UA UA UA 0 0 0 |
| | 87 | |
| | 88 | CHIP values: |
| | 89 | 0x46: EEPROM is a 93xx46 |
| | 90 | 0x56: EEPROM is a 93xx56 |
| | 91 | 0x66: EEPROM is a 93xx66 |
| | 92 | |
| | 93 | 17 UA UA UA 0 0 0 |
| | 94 | 18 UA UA UA VENDOR CHIP CHIP |
| | 95 | 19 UA UA UA VENDOR 0 0 |
| | 96 | |
| | 97 | 1a UA (all) |
| | 98 | |
| | 99 | |
| | 100 | Additional fields after the serial string: |
| | 101 | 0x00, 0x00 - reserved for "legacy port name prefix" |
| | 102 | 0x00, 0x00 - reserved for plug and play options |
| | 103 | (Observed values with PnP == 0: |
| | 104 | 0x02 0x03 0x01 0x00) |
| | 105 | |
| | 106 | Note: The additional fields after the serial number string |
| | 107 | collide with the official FTDI formula from AN_121 regarding |
| | 108 | the start of the user area: |
| | 109 | "Start Address = the address following the last byte of SerialNumber string." |
git://developer.intra2net.com / libftdi / blame_incremental