PC87393F datasheet(29/148 Pages) NSC

29 / 148 page

2.0 Device Architecture and Configuration (Continued)

www.national.com

2.2.3

Standard Logical Device 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 should not use read-modify-write during updates.

Table 7. Standard Control Registers

Table 8. Logical Device Activate Register

Note: When the X-Bus Extension is disabled, access to its registers (not the PnP registers) is disabled, but all bridging func-

tions continue to operate according to its register settings.

Table 9. I/O Space Conﬁguration Registers

Index

Description

07h

Logical Device

Number

This register selects the current logical device. See Table 6 for valid numbers. All

other values are reserved.

20h - 2Fh

SuperI/O

Conﬁguration

SuperI/O conﬁguration registers and ID registers

Index

Description

30h

Activate

Bit 0 - Logical device activation control

0: Disabled

1: Enabled

Bits 7-1 - Reserved

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.

PC87393F Scheda tecnica(PDF) 29 Page - National Semiconductor (TI)

PC87393F Scheda tecnica(HTML) 29 Page - National Semiconductor (TI)

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Scheda tecnica Scarica

Link URL