PC97307 datasheet(27/218 Pages) NSC

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Configuration

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2.3.1

Standard Plug and Play (PnP) Register Definitions

Tables 2-5 through 2-10 describe the standard Plug and Play registers. For more detailed information on these registers,

refer the

“Plug and Play ISA Specification, Version 1.0a, May 5, 1994.”.

TABLE 2-5. PnP Standard Control Registers

Index

Name

Deﬁnition

00h

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

Plug and Play 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 Plug and Play 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 and restores the contents of

conﬁguration registers to their power-up (default) values.

In addition, all the logical devices of the card enter their default state and the

CSN is preserved.

Bit 1 - Return to the Wait for Key state.

Writing this bit puts all cards in the Wait for Key state, with all CSNs preserved

and logical devices not affected.

Bit 2 - Reset CSN to 0.

Writing this bit causes every card to reset its CSN to zero.

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.

20h - 2Fh

Card Level,

Vendor Deﬁned

Vendor deﬁned registers.

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