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NAME
     pcii -- National Instruments PCIIA GPIB controller driver


SYNOPSIS
     device pcii

     In /boot/device.hints:
     hint.pcii.0.at="isa"
     hint.pcii.0.port="0x2e1"
     hint.pcii.0.irq="7"
     hint.pcii.0.drq="1"


DESCRIPTION
     The pcii driver provides support for driving an IEEE-488 bus, also called
     IEC-625 (or just "IEC bus"), or HP-IB (Hewlett Packard Instrument Bus),
     or GPIB (General Purpose Instrument Bus).  The driver supports National
     Instruments PCIIA cards (sometimes also refered to as PC2A) and
     compatibles.  These cards use a NEC uPD7210 controller IC as the main
     interface between the host computer and the instrument bus.

   IO memory space layout
     The PCIIA cards use a very specific IO memory space allocation layout.
     The address bits A0 through A9 (which have traditionally been the only
     address bits evaluated on IBM PC XT extension cards) are hardwired to
     address 0x2e1.  Bits A10 through A12 are used by the uPD7210 register
     select lines.  This makes the individual 7210 registers being 0x400 bytes
     apart in the ISA bus address space.  Address bits A13 and A14 are
     compared to a DIP switch setting on the card, allowing for up to 4
     different cards being installed (at base addresses 0x2e1, 0x22e1, 0x42e1,
     and 0x62e1, respectively).  A15 has been used to select an optional on-
     board time-of-day clock chip (MM58167A) on the original PCIIA rather than
     the uPD7210 (which is not implemented on later boards and clones).
     Finally, the IO addresses 0x2f0 ... 0x2f7 are used for a special
     interrupt handling feature (re-enable interrupts so the IRQ can be
     shared), where actually only address 0x2f0 plus the actual IRQ level is
     required for each card.  Some clones do not appear to require this
     special IRQ handling, and are thus likely to not support the shared IRQ
     feature.

     Only the base address of the card needs to be specified in the ISA device
     hints; the driver takes care to derive all other IO addresses needed
     during the probe phase.

   Supported cards
     The following cards are known to be supported:

           +o   B&C Microsystems PC488A-0

           +o   National Instruments GPIB-PCII/PCIIA (in PCIIa mode)

           +o   Axiom AX5488


SEE ALSO
     gpib(3), gpib(4), device.hints(5)


HISTORY
     The pcii driver was written by Poul-Henning Kamp, and first appeared in
     FreeBSD 5.4.


AUTHORS
     This manual page was written by Jorg Wunsch.