Manual Reference Pages - PCII (4)
- National Instruments PCIIA GPIB controller driver
IO memory space layout
.Cd device pcii
.Cd hint.pcii.0.at= isa
.Cd hint.pcii.0.port= 0x2e1
.Cd hint.pcii.0.irq= 7
.Cd hint.pcii.0.drq= 1
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 referred to as PC2A) and compatibles.
These cards use a NEC PD7210 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
Bits A10 through A12 are used by the PD7210 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 PD7210
(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.
The following cards are known to be supported:
- B&C Microsystems PC488A-0
- National Instruments GPIB-PCII/PCIIA (in PCIIa mode)
- Axiom AX5488
driver was written by Poul-Henning Kamp, and first appeared in
.Fx 5.4 .
This manual page was written by
.An Jrg Wunsch .
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