PCI6621 datasheet(41/204 Pages) TI

41 / 204 page

2−21

Table 2−11. 16-Bit PC Card Interface Control Terminals (Continued)

SKT A TERMINAL

SKT B TERMINAL†

DESCRIPTION

I/O

POWER

NAME

NO.

NAME

NO.

DESCRIPTION

I/O

TYPE

POWER

RAIL

A_OE

C12

B_OE

L18

Output enable. OE is driven low by the controller 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 controller asserts OE to indicate TC for a DMA

write operation.

VCCA/

VCCB

A_READY

(IREQ)

C04

B_READY

(IREQ)

B19

Ready. The ready function is provided when the 16-bit PC Card and the host socket are

configured for the memory-only interface. READY is driven low by 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

controller on the 16-bit I/O PC Card requires service by the host software. IREQ is high

(deasserted) when no interrupt is requested.

VCCA/

VCCB

A_REG

C05

B_REG

F15

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 controller 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.

VCCA/

VCCB

A_RESET

A06

B_RESET

F17

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

VCCA/

VCCB

A_VS1

A_VS2

A03

E08

B_VS1

B_VS2

C18

F19

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

each other, determine the operating voltage of the PC Card.

I/O

VCCA/

VCCB

A_WAIT

B03

B_WAIT

B18

Bus cycle wait. WAIT is driven by a 16-bit PC Card to extend the completion of the

memory or I/O cycle in progress.

VCCA/

VCCB

A_WE

B09

B_WE

J15

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 a TC during DMA operations to a 16-bit PC Card

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

operation.

VCCA/

VCCB

A_WP

(IOIS16)

C03

B_WP

(IOIS16)

A18

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, then the PC Card asserts WP to indicate a

request for a DMA operation.

VCCA/

VCCB

† These terminals are reserved for the PCI6611 and PCI6411 controllers.

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