* Depends on state of ADD pins see Table 1.

2.2 Device Reset Operation

A Device Reset operation is performed in the following conditions:

•

At device power-up.

•

When the Reset bit in the Device Control register is set to 1 (see Section 2.8 "Device Control").

The Device Reset operation performs the following:

•

Aborts any device operation in progress and restarts device operation.

•

Sets all device registers to their "Reset" (default) value.

2.3 DEVICE NUMBER (Addr 00o)

This register is used to specify a unique address for each device on the bus.

Reg Add

Register Name

R/

W

P

O

R

Val

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

LSb

000 000

Device Number

R

4h-1h

Reserved

AS2

AS1

AS0

00000

The value of AS2:AS0 is determined by the setting of the ADD0 and ADD1 input pins:

TABLE 1. Device Number Assignment

[ADD1:ADD0]

[AS2:AS0]

00

001

01

010

[ADD1:ADD0]

[AS2:AS0]

10

011

11

100

The value of AS2:AS0 will directly change and follow the value determined by ADD1:ADD0. Since this is a read only register the

value of the address cannot be changed by software.

2.4 MANUFACTURER ID (Addr 01o)

Reg

Add

Register

Name

R/

W

P

O

R

Val

Bit

15

MSb

Bit

14

Bit

13

Bit

12

Bit

11

Bit

10

Bit

9

Bit

8

Bit

7

Bit

6

Bit

5

Bit

4

Bit

3

Bit

2

Bit

1

Bit

0

LSb

000 001

Manufacturer

ID

R 100Bh

0001000000001011

The manufacturer ID matches that assigned to National Semiconductor by the PCI SIG. This register may be used to identify the

manufacturer of the device in order to perform manufacturer specific operations.

2.5 DEVICE ID (Addr 02o)

Reg

Add

Register

Name

R/

W

P

O

R

Val

Bit

15

MSb

Bit

14

Bit

13

Bit

12

Bit

11

Bit

10

Bit

9

Bit

8

Bit

7

Bit

6

Bit

5

Bit

4

Bit

3

Bit

2

Bit

1

Bit

0

LSb

000 010 Device ID

R

21h

RevID

DeviceID

0000000000100001

The device ID is defined by the manufacturer of the device and is unique for each device produced by a manufacturer. Bits 15-11

identify the revision number of die and will be incremented upon revision of the device.

Bit

Type

Description

10-0

RO

DeviceID (Device ID Value) A fixed value that identifies the device.

15-11

RO

RevID (Revision ID Value) A fixed value that identifies the device revision.

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