PC87309 datasheet(23/192 Pages) NSC

23 / 192 page

Configuration

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TABLE 2-5. Plug and Play (PnP) Logical Device Control Registers

TABLE 2-6. Plug and Play (PnP) I/O Space Conﬁguration Registers

Index

Name

Deﬁnition

0030h

Activate

For each logical device there is one Activate register that controls whether or not

the logical device is active on the ISA bus.

This is a read/write register.

Before a logical device is activated, I/O Range Check must be disabled.

Bit 0 - Logical Device Activation Control

0: Do not activate the logical device.

1: Activate the logical device.

Bits 7-1 - Reserved

These bits are reserved and return 0 on reads.

0031h

I/O Range Check This register is used to perform a conﬂict check on the I/O port range programmed

for use by a logical device.

This register is read/write.

Bit 0 - I/O Range Check control

0: The logical device drives 00AAh.

1: The logical device responds to I/O reads of the logical device's assigned I/O

range with a 0055h when I/O Range Check is enabled.

Bit 1 - Enable I/O Range Check

0: I/O Range Check is disabled.

1: I/O Range Check is enabled. (I/O Range Check is valid only when the logical

device is inactive).

Bits 7-2 - Reserved

These bits are reserved and return 0 on reads.

Index

Name

Deﬁnition

60h

I/O Port Base

Address Bits (15-8)

Descriptor 0

Read/write value indicating the selected I/O lower limit address bits 15-8 for I/O

descriptor 0. Bits 7-3 (for A15-11) are read only 00000b.

61h

I/O Port Base

Address Bits (7-0)

Descriptor 0

Read/write value indicating the selected I/O lower limit address bits 7-0 for I/O

descriptor 0.

62h

I/O Port Base

Address Bits (15-8)

Descriptor 1

Read/write value indicating the selected I/O lower limit address bits 15-8 for I/O

descriptor 1. Bits 7-3 (for A15-11) are ready only 00000b.

63h

I/O Port Base

Address Bits (7-0)

Descriptor 1

Read/write value indicating the selected I/O lower limit address bits 7-0 for I/O

descriptor 1.

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