PCI4451 datasheet(40/216 Pages) TI

40 / 216 page

2–22

Table 2–17. 16-Bit PC Card Interface Control (slots A and B) (Continued)

TERMINAL

GFN NO.

GJG NO.

I/O

FUNCTION

NAME

SLOT

A†

SLOT

B‡

SLOT

A†

SLOT

B‡

I/O

FUNCTION

F18

F19

Output enable. OE is driven low by the PCI4451 to enable 16-bit memory PC Card

data output during host memory read cycles.

DMA terminal count. OE is used as terminal count (TC) during DMA operations to

a 16-bit PC Card that supports DMA. The PCI4451 asserts OE to indicate TC for

a DMA write operation.

READY

(IREQ)

A12

E11

Ready. The ready function is provided by READY 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 command.

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.

REG

C13

A12

Attribute memory select. REG remains high for all common memory accesses.

When REG is asserted, access is limited to attribute memory (OE or WE active) and

to the I/O space (IORD or IOWR active). Attribute memory is a separately accessed

section of card memory and is generally used to record card capacity and other

configuration and attribute information.

DMA acknowledge. REG is used as a DMA acknowledge (DACK) during DMA

operations to a 16-bit PC Card that supports DMA. The PCI4451 asserts REG to

indicate a DMA operation. REG is used in conjunction with the DMA read (IOWR)

or DMA write (IORD) strobes to transfer data.

RESET

B15

F13

PC Card reset. RESET forces a hard reset to a 16-bit PC Card.

WAIT

B11

F11

Bus cycle wait. WAIT is driven by a 16-bit PC Card to delay the completion of (i.e.,

extend) the memory or I/O cycle in progress.

A19

B18

Write enable. WE is used to strobe memory write data into 16-bit memory PC Cards.

WE is also used for memory PC Cards that employ programmable memory

technologies.

DMA terminal count. WE is used as TC during DMA operations to a 16-bit PC Card

that supports DMA. The PCI4451 asserts WE to indicate TC for a DMA read

operation.

(IOIS16)

A10

B10

Write protect. WP applies to 16-bit memory PC Cards. WP reflects the status of the

write-protect switch on 16-bit memory PC Cards. For 16-bit I/O cards, WP is used

for the 16-bit port (IOIS16) function.

I/O is 16 bits. IOIS16 applies to 16-bit I/O PC Cards. IOIS16 is asserted by the 16-bit

PC Card when the address on the bus corresponds to an address to which the 16-bit

PC Card responds, and the I/O port that is addressed is capable of 16-bit accesses.

DMA request. WP can be used as the DMA request signal during DMA operations

to a 16-bit PC Card that supports DMA. If used, the PC Card asserts WP to indicate

a request for a DMA operation.

VS1

VS2

B12

C15

B11

A14

I/O

Voltage sense 1 and voltage sense 2. VS1 and VS2, when used in conjunction

with each other, determine the operating voltage of the 16-bit PC Card.

† Terminal name for slot A is preceded with A_. For example, the full name for terminal C1 is A_WE.

‡ Terminal name for slot B is preceded with B_. For example, the full name for terminal A19 is B_WE.

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