PCI1221 datasheet(18/123 Pages) TI

18 / 123 page

PCI1221 GHK/PDV

PC CARD CONTROLLERS

SCPS042 – JULY 1998

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

Terminal Functions (Continued)

16-bit PC Card interface control (slots A and B) (continued)

TERMINAL

PIN NUMBER

I/O

FUNCTION

NAME

SLOT A†

SLOT B‡

TYPE

FUNCTION

PDV

GHK

PDV

GHK

READY

(IREQ)

135

J17

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

130

K17

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.

RESET

124

L18

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

WAIT

136

J14

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.

110

R19

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.

(IOIS16)

139

H18

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.

VS1

VS2

134

122

J18

M19

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 terminals 110 and R19 are A_WE.

‡ Terminal name for slot B is preceded with B_. For example, the full name for terminals 46 and P3 are B_WE.

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