DP83821 datasheet(63/86 Pages) NSC

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4.0 Register Set (Continued)

4.2.23 Boot ROM Address Register

The BRAR is used to setup the address for an access to an external ROM/FLASH device.

4.2.24 Boot ROM Data Register

The BRDR is used to read and write ROM/FLASH data from the data from/to an external ROM/FLASH device.

4.2.25 Silicon Revision Register

Tag: BRAR

Size: 32 bits

Hard Reset: FFFFFFFFh

Offset: 0050h

Access: Read Write

Soft Reset: FFFFFFFFh

bit

tag

description

usage

AUTOINC

Auto-Increment

When set, the contents of ADDR will auto increment with every 32-bit

access to the BRDR register.

30-16

unused

15-0

ADDR

Boot ROM Address

16-bit address used to access the external Boot ROM.

Tag: BRDR

Size: 32 bits

Hard Reset: undefined

Offset: 0054h

Access: Read Write

Soft Reset: undefined

bit

tag

description

usage

31-0

DATA

Boot ROM Data

Access port to external Boot ROM. Software can use BRAR and BRDR to

read (and write if FLASH memory is used) the external Boot ROM. All

accesses must be 32-bits wide and aligned on 32-bit boundaries.

Tag: SRR

Size: 32 bits

Hard Reset: as defined

Offset: 0058h

Access: Read Only

Soft Reset: unchanged

bit

tag

description

usage

31-16

unused (reads return 0)

15-0

REV

Revision Level

Silicon Revision for the DP83821.

Rev B 0103h

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