PCI7510 datasheet(35/234 Pages) TI

35 / 234 page

2–16

Table 2–12. 16-Bit PC Card Interface Control Terminals

TERMINAL

NAME

NUMBER

I/O

DESCRIPTION

NAME

PDV

GHK

I/O

DESCRIPTION

BVD1

(STSCHG/RI)

185

A09

Battery voltage detect 1. BVD1 is generated by 16-bit memory PC Cards that include batteries. BVD1

is used with BVD2 as an indication of the condition of the batteries on a memory PC Card. Both BVD1

and BVD2 are high when the battery is good. When BVD2 is low and BVD1 is high, the battery is weak

and must be replaced. When BVD1 is low, the battery is no longer serviceable and the data in the

memory PC Card is lost. See Section 5.6, ExCA Card Status-Change Interrupt Configuration

ExCA Interface Status Register, for the status bits for this signal.

Status change. STSCHG is used to alert the system to a change in the READY, write protect, or

battery voltage dead condition of a 16-bit I/O PC Card.

Ring indicate. RI is used by 16-bit modem cards to indicate a ring detection.

BVD2

(SPKR)

184

F10

Battery voltage detect 2. BVD2 is generated by 16-bit memory PC Cards that include batteries. BVD2

is used with BVD1 as an indication of the condition of the batteries on a memory PC Card. Both BVD1

and BVD2 are high when the battery is good. When BVD2 is low and BVD1 is high, the battery is weak

and must be replaced. When BVD1 is low, the battery is no longer serviceable and the data in the

memory PC Card is lost. See Section 5.6, ExCA Card Status-Change Interrupt Configuration

ExCA Interface Status Register, for the status bits for this signal.

Speaker. SPKR is an optional binary audio signal available only when the card and socket have been

configured for the 16-bit I/O interface. The audio signals from cards A and B are combined by the

PCI7510 device and are output on SPKROUT.

CD1

CD2

125

187

L17

C09

Card detect 1 and card detect 2. CD1 and CD2 are internally connected to ground on the PC Card.

When a PC Card is inserted into a socket, CD1 and CD2 are pulled low. For signal status, see

Section 5.2, ExCA Interface Status Register.

CE1

CE2

137

140

J15

H17

Card enable 1 and card enable 2. CE1 and CE2 enable even- and odd-numbered address bytes. CE1

enables even-numbered address bytes, and CE2 enables odd-numbered address bytes.

INPACK

173

B12

Input acknowledge. INPACK is asserted by the PC Card when it can respond to an I/O read cycle

at the current address.

IORD

144

G18

I/O read. IORD is asserted by the PCI7510 device to enable 16-bit I/O PC Card data output during

host I/O read cycles.

IOWR

145

G17

I/O write. IOWR is driven low by the PCI7510 device to strobe write data into 16-bit I/O PC Cards

during host I/O write cycles.

141

H14

Output enable. OE is driven low by the PCI7510 device to enable 16-bit memory PC Card data output

during host memory read cycles.

READY

(IREQ)

182

C10

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 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

176

B11

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

169

B13

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

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