Flash Memory Card Comparison
xD Picture Card is another type of removable flash memory card. The xD Picture Card format is primarily used with digital cameras; however that also means that the reader shows up on printers and personal computers. I understand that currently only two camera manufacturers use the xD format. The media reader on my personal computer and printer have a slot which accepts an xD Picture Card flash module.
The xD Picture Card card dimensions are: 0.79 x 0.98 x .067 in.
The memory size may vary, but currently ships as either 512MB, 256MB, or 128M
Bytes of flash memory.
There are number of other card types in this
family, refer to the Flash Memory Stick Formats.
Refer to
the graphic below for a comparison of the different sizes of flash
memory.
| Pin # | Pin name | Signal Function |
| 1 | Vcc | Power |
| 2 | D7 | Data7 |
| 3 | D6 | Data6 |
| 4 | D5 | Data5 |
| 5 | D4 | Data4 |
| 6 | D3 | Data3 |
| 7 | D2 | Data2 |
| 8 | D1 | Data1 |
| 9 | D0 | Data0 |
| 10 | GND | Ground |
| 11 | -WP | Write Protect |
| 12 | -WE | Write Enable |
| 13 | ALE | Address Latch Enable |
| 14 | CLE | Command Latch Enable |
| 15 | -CE | Card Enable |
| 16 | -RE | Read Enable |
| 17 | R/-B | Ready/-Busy (Open-drain) |
| 18 | GND | Ground (+Presence detect) |
Note; 'xD' could also mean 'extreme Digital'
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