2-68 Service Guide
Table 2-13 PCI1131 Pin Descriptions (Continued)
TERMINAL
Name Slot
Slot
I/O
TYPE
FUNCTION
A+ B≠≠
1 6-bit PC Card Address and Data (Slots A and B)
IORD 99 33 OI/O Read. LORD is asserted by the PCI1131 to enable 16-bit l/O PC
Card data output during host I/O read cycles.
(DMA Write) This pin is used as the DMA write strobe during DMA
operations from a 16-bit PC Card which supports DMA. The PCI 1131
asserts this signal during DMA transfers from the PC Card to host
memory.
IOWR 101 35 OI/O Write. IOWR is driven low by the PCI1131 to strobe write data into
16-bit l/O PC Cards during host I/O write cycles.
(DMA Read) This pin is used as the DMA read strobe during DMA
operations to a 16-bit PC Card which supports DMA. The PCI 1131
asserts this signal during DMA transfers from host memory to the PC
Card.
OE 98 32 OOutput Enable. OE is driven low by the PCI 1131 to enable 16-bit
Memory PC Card data output during host memory read cycles.
(DMA Terminal Count) This pin is used as TC during DMA operations to
a 16-bit PC Card which supports DMA. The PCI 1131 asserts this
signal to indicate Terminal Count for a DMA write operation .
WAIT 136 70 IBus Cycle Wait. WET is driven by a 16-bit PC Card to delay the
completion of (i e. extend) the memory or l/O cycle that is in progress.
WE 110 46 OWrite Enable . WE is used to strobe memory write data into 16-bit
Memory PC Cards. VVE is also used for memory PC Cards that employ
programmable memory technologies.
(DMA Terminal Count) This pin is used as TC during DMA operations to
a 16-bit PC Card which supports DMA. The PCI 1131 asserts this
signal to indicate Terminal Count for a DMA read operation.
READY 135 69
(IREQ)
IReady . The ready function is provided by the READY signal when the
16-bit PC Card and the host socket are configured for the memory-only
interface. READY is driven low by the 16-bit Memory
PC Cards to indicate that the memory card circuits are busy processing
a previous write command. READY is driven high when the 16-bit
Memory PC Card is ready to accept a new data transfer.
Interrupt Request. IREQ is asserted by a 16-bit I/O PC Card to indicate
to the host that a device on the 16-bit I/O PC Card requires service by
the host software. IREQ is high (deasserted) when no interrupt is
requested.
+ Terminal name is preceded with A_. As an example, the full name for terminal 121 is A_A25.
≠ Terminal name is preceded with B_. As an example, the full name for terminal 55 is B_A25.