PC87383 datasheet(21/77 Pages) NSC

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3.0 Device Architecture and Configuration (Continued)

Revision 1.1

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3.2.3

Standard Configuration Register Definitions

In the registers below, any undefined bit is reserved. Unless otherwise noted, the following definitions also hold true:

All registers are read/write.

All reserved bits return 0 on reads, except where noted otherwise. To prevent unpredictable results, do not modify

these bits. Use read-modify-write to prevent the values of reserved bits from being changed during write.

Write-only registers must not use read-modify-write during updates.

Table 9. Standard General Conﬁguration Registers

Index

Description

07h

Logical Device

Number

This register selects the current logical device. See Table 8 for valid numbers. All

other values are reserved.

20h-2Fh

PC87383

Conﬁguration

PC87383 conﬁguration registers and ID registers.

Table 10. Logical Device Activate Register

Index

Description

30h

Activate

Bits 7-1: Reserved.

Bit 0:

Logical device activation control; see Section 3.3 on page 25.

0: Disabled.

1: Enabled.

Table 11. I/O Space Conﬁguration Registers

Index

Description

60h

I/O Port Base

Address Bits 15-8

Descriptor 0

Indicates 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

Indicates selected I/O lower limit address bits 7-0 for I/O Descriptor 0.

PC87383 Datasheet(PDF) 21 Page - National Semiconductor (TI)

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