developer.intra2net.com Git - libftdi/blob - doc/EEPROM-structure

   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)
   7 bytes
   8
   9 Type   |  Use extra EEPROM space
  10 FT2XXB |  No
  11
  12 Byte.BIT| TYPE_AM TYPE_BM   TYPE_2232C       TYPE_R          TYPE_2232H       TYPE_4232H
  13 00.0    |      0       0   channel_a_type                    channel_a_type   channel_a_type
  14 00.1    |      0       0   channel_a_type                    channel_a_type   channel_a_type
  15 00.2    |      0       0   channel_a_type   high_current     channel_a_type   channel_a_type
  16 00.3    |      0       0   channel_a_driver channel_a_driver channel_a_driver channel_a_driver
  17 00.4    |      0       0   high_current_a   0                0                0
  18 00.5    |      0       0   0                0                0                0
  19 00.6    |      0       0   0                0                0                0
  20 00.7    |      0       0   0                0                SUSPEND_DBUS7    0
  21
  22 On TYPE_R 00.3 set mean D2XX, on other devices VCP
  23
  24 01.0    |      0       0   channel_b_type                    channel_b_type   channel_b_type
  25 01.1    |      0       0   channel_b_type                    channel_b_type   channel_b_type
  26 01.2    |      0       0   channel_b_type   0                channel_b_type   channel_b_type
  27 01.3    |      0       0   channel_b_driver 0                channel_b_driver channel_b_driver
  28 01.4    |      0       0   high_current_b   0                0                0
  29 01.5    |      0       0   0                0                0                0
  30 01.6    |      0       0   0                                0                0
  31 01.7    |      0       0   0                0                0                0
  32
  33 Fixme: Missing 4232H validation and channel_c_driver, channel_d_driver, channel_a|b|c|d_rs484enable
  34
  35 02     | Vendor ID (VID) LSB (all)
  36 03     | Vendor ID (VID) MSB (all)
  37 04     | Product ID (PID) LSB (all)
  38 05     | Product ID (PID) MSB (all)
  39 06     | Device release number LSB (not tested on TYPE_4232H)
  40 07     | Device release number MSB (not tested on TYPE_4232H)
  41        |
  42 08.4   | Battery powered
  43 08.5   | Remote wakeup
  44 08.6   | Self powered: 1, bus powered: 0
  45 08.7   | Always 1
  46        |
  47 09     | Max power (mA/2)
  48        |
  49 Byte.BIT| TYPE_AM TYPE_BM            TYPE_2232C        TYPE_R       TYPE_2232H       TYPE_4232H
  50 0a.0    | 0       IsoIn
  51 0a.1    | 0       IsoOut
  52 0a.2    | 0       suspend_pull_down suspend_pull_down               suspend_pull_down
  53 0a.3    | 0       use_serial                                        use_serial
  54 0a.4    | 0       change_usb_version change_usb_version
  55 0a.5    | 0 - reserved
  56 0a.6    | 0 - reserved
  57 0a.7    | 0 - reserved
  58
  59        |
  60 0b     | TYPE_R Bitmask Invert, 0 else
  61
  62 Byte   | TYPE_AM TYPE_BM     TYPE_2232C   TYPE_R       TYPE_2232H       TYPE_4232H
  63 0c     | 0       USB-VER-LSB USB-VER-LSB  0            ?                ?
  64 0d     | 0       USB-VER-MSB USB-VER-MSB  0            ?                ?
  65 (On several FT2232H different values were observed -> The value is unused
  66  if change USB version is not set, so it might contain garbage)
  67
  68 0e     | OFFSET Vendor
  69 0f     | Len    VENDOR
  70
  71 10     | Offset Product
  72 11     | Length Product
  73
  74 12     | Offset Serial
  75 13     | Length Serial
  76
  77 Byte.BIT| TYPE_AM TYPE_BM   TYPE_2232C   TYPE_R       TYPE_2232H       TYPE_4232H
  78 14.3:0  | UA      UA        CHIP         CBUS[0]      AL               A
  79 14.7:0  | UA      UA        CHIP         CBUS[1]      AH               B
  80 15.3:0  | UA      UA        0            CBUS[2]      BL               C
  81 15.7:0  | UA      UA        0            CBUS[3]      BH               D
  82 16.3:0  | UA      UA        UA           CBUS[4]      0                0
  83 16.7:0  | UA      UA        UA           0            0                0
  84
  85 17        UA      UA        UA           0            0                0
  86 18        UA      UA        UA           VENDOR       CHIP             CHIP
  87 19        UA      UA        UA           VENDOR       0                0
  88
  89 1a        UA(all)
  90
  91 Mprog doesn's seem to write this:
  92 After last string
  93 0x02 0x03 0x01 with PnP == 0