PC87307 datasheet(28/218 Pages) NSC

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Configuration

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TABLE 2-6. PnP Logical Device Control Registers

TABLE 2-7. 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.

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.

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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