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Identifiers for PCMCIA Devices

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For Personal Computer Memory Card International Association (PCMCIA) devices, the device ID can take several different forms. For devices that are not multifunctional, the device identifier is formatted as follows:

PCMCIA\Manufacturer-Product-Crc(4)

Where:

  • Manufacturer is the name of the manufacturer.

  • Product is the name of the product.

The PCMCIA enumerator retrieves these strings directly from tuples on the card. Both Manufacturer and Product are variable-length strings that do not exceed 64 characters. Crc(4) is the 4-digit hexadecimal CRC (cyclic redundancy check) checksum for the card. Numbers less than four digits long have a leading zero fill. For example, the device ID for a network adapter might be this:

PCMCIA\MEGAHERTZ-CC10BT/2-BF05

For a multifunction card, every function has an identifier of the form:

PCMCIA\Manufacturer-Product-DEVd(4)-Crc(4)

The child function number (d(4) in this example) is a decimal number without leading zeros.

If the card does not have a name of the manufacturer, the identifier has one of these three forms:

PCMCIA\UNKNOWN_MANUFACTURER-Crc(4)

PCMCIA\UNKNOWN_MANUFACTURER-DEVd(4)-Crc(4)

PCMCIA\MTD-MemoryType(4)

The last of these three alternatives is for a flash memory card without a manufacturer identifier on the card. MemoryType(4) is one of two 4-digit hexadecimal numbers: 0000 for SRAM cards and 0002 for ROM cards.

In addition to the various forms of device ID just described, an INF file's Models section can also contain a hardware ID composed by replacing the 4-digit hexadecimal cyclic redundancy check (CRC) with a string that contains the 4-digit hexadecimal manufacturer code, a hyphen, and the 4-digit hexadecimal manufacturer information code (both from on-board tuples). For example:

PCMCIA\MEGAHERTZ-CC10BT/2-0128-0103

PCMCIA-compatible IDs correspond to the generic device IDs mentioned in the Generic Identifiers section. Currently, PCMCIA-compatible IDs are generated for only three device types as described in the following table.

PCMCIA-compatible ID Device type

PNP0600

An AT Attachment (ATA) disk driver

PNP0D00

A multifunction 3.0 PC Card

*PNPC200

A modem card