PC87309VLJ datasheet(22/192 Pages) NSC

22 / 192 page

Configuration

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TABLE 2-4. Plug and Play (PnP) Standard Control Registers

Index

Name

Description

00h

Set RD_DATA Port Writing to this location modiﬁes the address of the port used for reading from the

PnP ISA cards. Data bits 7-0 are loaded into I/O read port address bits 9-2.

Reads from this register are ignored. Bits1 and 0 are ﬁxed at the value 11.

01h

Serial Isolation

Reading this register causes a PnP card in the Isolation state to compare one bit

of the ID of the board. This register is read only.

02h

Conﬁg Control

This register is write-only. The values are not sticky, that is, hardware automatically

clears the bits and there is no need for software to do so.

Bit 0 - Reset

Writing this bit resets all logical devices (except the KBC, Logical Device 6) and

restores the contents of conﬁguration registers to their power-up (default) values.

In addition, all the logical devices enter their default state and the CSN is

preserved.

Bit 1 - Return to the Wait for Key state.

Writing this bit puts the device in the Wait for Key state, with CSN preserved and

logical devices not affected. This bit is ignored in Motherboard PnP mode.

Bit 2 - Reset CSN to 0.

03h

Wake[CSN]

A write to this port causes all cards that have a CSN that matches the write data

in bits 7-0 to go from the Sleep state to either the Isolation state, if the write data

for this command is zero, or the Conﬁg state, if the write data is not zero. It also

resets the pointer to the byte-serial device.

This register is write-only.

04h

Resource Data

This address holds the next byte of resource information. The Status register must

be polled until bit 0 of this register is set to 1 before this register can be read.

This register is read-only.

005

Status

When bit 0 of this register is set to 1, the next data byte is available for reading

from the Resource Data register.

This register is read-only.

06h

Card Select

Number (CSN)

Writing to this port assigns a CSN to a card. The CSN is a value uniquely assigned

to each ISA card after the serial identiﬁcation process so that each card may be

individually selected during a Wake[CSN] command.

This register is read/write.

07h

Logical Device

Number

This register selects the current logical device. All reads and writes of memory, I/O,

interrupt and DMA conﬁguration information access the registers of the logical

device written here. In addition, the I/O Range Check and Activate commands

operate only on the selected logical device.

This register is read/write.

20h - 2Fh

Card Level,

Vendor Deﬁned

Vendor deﬁned registers.

PC87309VLJ 数据表(PDF) 22 Page - National Semiconductor (TI)

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