MPC821 datasheet(56/242 Pages) NXP

56 / 242 page

Functional Description

MPC8XXFADS Design Specification—Rev 0.1

PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE

The description of BCSR3 is shown in TABLE 4-19. "BCSR3 Description" on page 54.

a. This is a WRITE ONLY bit so it does not conflict with the DBID filed which is READ ONLY.

TABLE 4-19. BCSR3 Description

BIT

MNEMONIC

Function

PON

DEF

ATT.

0 - 1

Reserved

Implemented

’00’

2 - 7

DBID(0:5)

Daughter Board ID. This ﬁeld holds a code for the daughter board ID. Each

Daughter board carries a unique ID code. For the speciﬁc daughter boards’

codes see

TABLE 4-20. "Daughter Boards’ ID Codes" on page 54.

-R

CNT_REG_EN_P

ROTECT

Control Register Enable Protect. When this bit is active (low) the

BCSR_EN bit in that register can not be written. When in-active, BCSR_EN

may be written to remove the BCSR from the memory map. After any write

to BCSR1 this bit becomes active again. This bit is a write-only bit on that

6 - 7

Reserved

Un-Implemented

BREVN0

Board Revision Number 0. This is the MS bit of the Board Revision

Number. See

TABLE 4-18. "MPC8XXFADS Daughter Boards’

Revision Encoding" on page 53, for the interpretation of the Board

Revision Number.

-R

9 - 11

FLASH_PD(7:5)

Flash Presence Detect(7:5). These lines are connected to the Flash SIMM

presence detect lines which encode the Delay of Flash SIMM mounted on

the Flash SIMM socket - U15. There are additional 4 presence detect lines

which encode the SIMM’s Type but appear in BCSR2. For the encoding of

FLASH_PD(7:5) see

TABLE 4-22. "FLASH Presence Detect (7:5)

Encoding" on page 55.

BREVN1

Board Revision Number 1. Second bit of the Board Revision Number. See

TABLE 4-18. "MPC8XXFADS Daughter Boards’ Revision Encoding"

on page 53, for the interpretation of the Board Revision Number.

-R

Reserved

Implemented

’0’

14 - 15

BREVN(2:3)

Board Revision Number (2:3). The 2 LS bits of the Board Revision

Number. See

TABLE 4-18. "MPC8XXFADS Daughter Boards’

Revision Encoding" on page 53, for the interpretation of the Board

Revision Number.

-R

TABLE 4-20. Daughter Boards’ ID Codes

DBID(0:5)

[HEX}

MPC8XX On

D/B

Reserveda.

MPC813b

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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