PC87417 Datasheet, PDF(123/257 Page) National Semiconductor (TI) – LPC ServerI/O for Servers and Workstations

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PC87417 Datasheet, PDF (123/257 Pages) National Semiconductor (TI) – LPC ServerI/O for Servers and Workstations

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6.0 ACCESS.bus Interface (Continued)

Table 33. Logical Device Number (LDN) Assignment for ACCESS.bus

LDN

Functional Block

00h

Floppy Disk Controller (FDC)

01h

Parallel Port (PP)

02h

Serial Port 2 (SP2)

03h

Serial Port 1 (SP1)

04h

System Wake-Up Control (SWC)

06h

Keyboard and Mouse Controller (KBC)1

07h

General-Purpose I/O (GPIO) Ports

0Fh

X-Bus Extension (PC87417)

10h

Real Time Clock (RTC)2

30h

PM1b_EVT_BLK (SWC-ACPI)

31h

PM1b_CNT_BLK (SWC-ACPI)

32h

GPE1_BLK (SWC-ACPI)

3Eh

Device Configuration (CONFIG)3,4

3Fh

ACCESS.bus Interface (ACB)3

1. This Logical Device has two chip selects for the Index/Data registers, each

pointed to by a different Base Address in the conï¬guration. The A2 bit of the Off-

set Address Byte differentiates between the two chip selects:

A2 = 0: the Index/Data registers pointed to by the Base Address at 60h and 61h

A2 = 1: the Index/Data registers pointed to by the Base Address at 62h and 63h.

2. This Logical Device has two chip selects for the Index/Data registers, each

pointed to by a different Base Address in the conï¬guration. The A1 bit of the Off-

set Address Byte differentiates between the two chip selects (see Note 1

above).

3. This Logical Device is accessible only through the ACCESS.bus.

4. Access to this Logical Device is through the Index register located at offset 00h

and data register located at offset 01h.

Offset Address Byte Type

This is an 8-bit value representing either of the following:

â¢ Internal access - the offset address from the base of the functional block.

â¢ External access - eight bits of the offset address from the base of the X-Bus chip-select (PC87417).

The offset address value must be within the defined range for the selected Logical Device or X-Bus chip-select. Offset values

outside this range are reserved.

Data Byte Type

This is an 8-bit value representing either the written or read data.

PEC Byte Type

This is an 8-bit value representing the 8-bit cyclic redundancy check of all the transferred bytes (see Section 6.2.8 on

page 120).

Revision 1.2

123

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