AM79C930VCW datasheet(124/161 Pages) AMD

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P R E L I M I N A R Y

124

Am79C930

PCMCIA CCR Registers and PCMCIA

CIS Space

Two bytes of attribute memory space have been

used by the Am79C930 device for storage of two card

configuration registers. These two registers are found

at attribute memory locations 800h and 802h. The

Configuration Option Register is located at Attribute

memory location 800h and the Card Configuration

and Status Register is located at Attribute memory

location 802h.

Because the location of these registers is fixed at 800h

and 802 in attribute memory space, then the value of the

CCR Offset located in the TPCC_RADR field of the Con-

figuration Tuple

must be equal to 800h.

PCMCIA Configuration Option Register

This register is used to configure the Am79C930 device

and to issue a soft reset to the Am79C930 device.

The PCMCIA Configuration Option Register is located

at the fixed attribute memory location 0802h. Therefore,

the information programmed into the CIS must give the

value 2K (=0800h) as the Card Configuration Registers

Base Address in the TPCC_RADR field of the Configu-

ration Tuple. The Configuration Option Register is lo-

cated at TPCC_RADR + 2.

The following tables indicate the bits that are supported

in the Configuration Option Registers:

Bit

Name

Reset Value

Description

SRESET

Resets Am79C930 device. Setting this bit to 1 places the

Am79C930 device into the reset state, which is equivalent to the as-

sertion of the PCMCIA RESET signal. This bit does not reset itself

back to 0.

LevelReq

Level Mode Interrupts when LevelReq = 1. Pulse Mode Interrupts

when LevelReq = 0.

5:0

Conf Index

Configuration Index. This field is written with the index number of

the entry in the card’s Configuration Table which the system

chooses for this card. When Conf Index = “00000,” then the

Am79C930 device is in memory only mode. When any of these five

bits is set to 1, then the I/O interface is enabled, meaning that I/O

transfers are allowed.

PCMCIA Card Configuration and Status Register

This

contains

information

about

the

card’s condition.

The PCMCIA Card Configuration and Status Register is

located at the fixed attribute memory location 0802h.

Therefore, the information programmed into the CIS

must give the value 2K (=0800h) as the Card Configura-

tion Registers Base Address in the TPCC_RADR field of

the Configuration Tuple. The Card Configuration and

Status Register is located at TPCC_RADR + 2.

Bit

Name

Reset Value

Description

7:6

Reserved

–

Read only as a 0.

IOIS8

This bit is written by the host to indicate that the host is only capable

of 8-bit I/O accesses. This bit is ignored by the Am79C930 device,

since the Am79C930 device is only capable of 8-bit I/O accesses.

Wakeup

WAKEUP is used with the STSCHGFN bit of TCR15 to determine

the function of the

STSCHG pin. When the STSCHGFN bit of

TCR15 is set to 1, then the WAKEUP bit is NANDed with the value

of the STSCHGD bit of MIR8 and the result is driven onto the

STSCHG pin.

When the STSCHGFN bit of TCR15 is set to 0, then the STSCHG

pin becomes an output that is controlled by the STSCHGD bit

of MIR8.

Read-back

Read/Write bit – serves no other function.

Power Down

Requests the 80188 to enter power down mode. If already in power

down mode, this bit will indicate 1. When written with a 1, value read

will remain 0 until the device actually enters the power down mode.

AM79C930VCW Datasheet(PDF) 124 Page - Advanced Micro Devices

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