* Depends on state of ADD pins see Section 2.3 "Device Number".

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: 000 000; 00h)

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

7h or 1h

Reserved

AS2

AS1

AS0

00000

The value of [AS2:AS0] is determined by the setting of the ADD input pin:

TABLE 1. Device Number Assignment

ADD

[AS2:AS0]

0

001

1

111

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

of the address cannot be changed by software.

2.4 MANUFACTURER ID (Addr: 000 001; 01h)

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.

www.national.com

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