CompactFlash uses a 50-Pin connector [2 rows of 25 pins]. The 50-pin
connector is on 50-mil centers [1.27mm].
Pins 1 to 25 are located on the
row near the key, and pins 26 to 50 are located in the row above that.
Active low signal use a '-' prefix. The CompactFlash card operates in one
of three modes. The function of some of the pins change with each mode.
The three modes are PC Card ATA using I/O mode, PC Card ATA using Memory
mode, and True IDE mode compatible with most IDE drives. This page lists
the True IDE mode pinout.
Refer to these pages for additional pin out
styles of CompactFlash.
PC Card Memory
Module Pinout
PC Card I/O Mode
Pinout
The main CompactFlash page.
| Pin # | Signal Function | Pin Type | In, Out Type |
| 1 | GND | - | Ground |
| 2 | D03 | I/O | I1Z, 0Z3 |
| 3 | D04 | I/O | I1Z, 0Z3 |
| 4 | D05 | I/O | I1Z, 0Z3 |
| 5 | D06 | I/O | I1Z, 0Z3 |
| 6 | D07 | I/O | I1Z, 0Z3 |
| 7 | -CS0 | I | I3U |
| 8 | A10 | I | I1Z |
| 9 | ATA SEL | I | I3U |
| 10 | A09 | I | I1Z |
| 11 | A08 | I | I1Z |
| 12 | A07 | I | I1Z |
| 13 | Vcc | - | Power |
| 14 | A06 | I | I1Z |
| 15 | A05 | I | I1Z |
| 16 | A04 | I | I1Z |
| 17 | A03 | I | I1Z |
| 18 | A02 | I | I1Z |
| 19 | A01 | I | I1Z |
| 20 | A00 | I | I1Z |
| 21 | D00 | I/O | I1Z, OZ3 |
| 22 | D01 | I/O | I1Z, OZ3 |
| 23 | D02 | I/O | I1Z, OZ3 |
| 24 | IOCS16 | O | OT3 |
| 25 | -CD2 | O | Ground |
| 26 | -CD1 | O | Ground |
| 27 | D11 | I/O | I1Z, OZ3 |
| 28 | D12 | I/O | I1Z, OZ3 |
| 29 | D13 | I/O | I1Z, OZ3 |
| 30 | D14 | I/O | I1Z, OZ3 |
| 31 | D15 | I/O | I1Z, OZ3 |
| 32 | -CS1 | I | I3U |
| 33 | -VS1 | O | Ground |
| 34 | -IORD | I | I3U |
| 35 | -IOWR | I | I3U |
| 36 | -WE | I | I3U |
| 37 | INTRQ | O | OZ1 |
| 38 | Vcc | - | Power |
| 39 | -CSEL | I | I2Z |
| 40 | -VS2 | O | Open |
| 41 | RESET | I | I2Z |
| 42 | IORDY | O | ON1 |
| 43 | RFU | O | OZ1 |
| 44 | RFU | I | I3U |
| 45 | -DASP | I/O | I1U,ON1 |
| 46 | -PDIAG | I/O | I1U,ON1 |
| 47 | DO8 | I/O | I1Z, OZ3 |
| 48 | DO9 | I/O | I1Z, OZ3 |
| 49 | D10 | I/O | I1Z, OZ3 |
| 50 | GND | - | Ground |
True IDE mode only uses A0 - A2; Pins 8, 10, 11, 12, 14, 15, 16 and pin
17 are grounded at the Host.
True IDE mode does not use this line; Pin 36
should be tied to Vcc at the host.
True IDE mode does not use this line;
Pin 44 should be held high or tied to Vcc at the Host.
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