CompactFlash Connector Pinout

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Connector pinout for: CompactFlash

The connector used with CompactFlash is similar to the PCMCIA Card connector, but with 50 pins. The connector in the host consists of two rows of 25 male contacts each on 50 mil (1.27 mm) centers.

Compact Flash 50 Pin Female Connector

Notes

• Low active signals have a "-" prefix.
• 1) These signals are required only for 16 bit accesses and not required when installed in 8 bit systems. Devices should allow for 3-state signals not to consume current.
• 2) The signal should be grounded by the host.
• 3) The signal should be tied to VCC by the host.
• 4) The mode is optional for CF+ Cards, but required for CompactFlash Storage Cards.
• 5) The -CSEL signal is ignored by the card in PC Card modes. However, because it is not pulled up on the card in these modes, it should not be left floating by the host in PC Card modes. In these modes, the pin should be connected by the host to PC Card A25 or grounded by the host.
• 6) If DMA operations are not used, the signal should be held high or tied to VCC by the host. For proper operation in older hosts: while DMA operations are not active, the card shall ignore this signal, including a floating condition
• 7) Signal usage in True IDE Mode except when Ultra DMA mode protocol is active.
• 8) Signal usage in True IDE Mode when Ultra DMA mode protocol DMA Write is active.
• 9) Signal usage in True IDE Mode when Ultra DMA mode protocol DMA Read is active.
• 10) Signal usage in PC Card I/O and Memory Mode when Ultra DMA mode protocol DMA Write is active.
• 11) Signal usage in PC Card I/O and Memory Mode when Ultra DMA mode protocol DMA Read is active.
• 12) Signal usage in PC Card I/O and Memory Mode when Ultra DMA protocol is active.
• 13) Signal is a totem-pole output during Ultra DMA data bursts in True IDE mode.

Electrical Description

The CompactFlash Storage Card functions in three basic modes:

• 1) PC Card ATA using I/O Mode
• 2) PC Card ATA using Memory Mode
• 3) True IDE Mode, which is compatible with most disk drives.

CompactFlash Storage Cards are required to support all three modes. The CF+ Cards normally function in the first and second modes, however they can optionally function in True IDE mode. The configuration of the CompactFlash Card shall be controlled using the standard PCMCIA PC Card configuration registers starting at address 200h in the Attribute Memory space of the storage card or for True IDE Mode, pin 9 being grounded. The configuration of the CF+ Card shall be controlled using configuration registers starting at the address defined in the Configuration Tuple (CISTPL_CONFIG) in the Attribute Memory space of the CF+ Card.

Differences Between CF Storage Card and CF Adapter

The CompactFlash Storage Card and the CompactFlash CF+ Card are electrically compatible with the CompactFlash Adapter. When a CompactFlash or CF+ card is installed in a CompactFlash adapter, the combination conforms to the PCMCIA PC Card Standard. CompactFlash products use a 50 pin connector and CompactFlash Adapters use a 68 pin connector. Both connectors use less than 50 signals. Table 50 shows the pinout differences between the CompactFlash Storage/CF+ Card and the CompactFlash Adapter.

Notes

• A signal name appearing alone is a PC Card memory mode, PC Card I/O and True IDE signal name
• A signal appearing alone before a "(" is both a PC Card memory mode and PC Card I/O mode signal name.
• A signal appearing before "/" is a PC Card memory mode signal name.
• A signal appearing after "/" is a PC Card I/O mode signal name.
• A signal appearing in "( )" is a True IDE mode signal name.
• A signal appearing in "( ^D)" is a True IDE mode DMA-only signal name.

References

• CF+ and CompactFlash Specification Revision 4.1 02/16/07

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