MPC821 datasheet(53/242 Pages) NXP

53 / 242 page

Functional Description

MPC8XXFADS Design Specification—Rev 0.1

PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE

"BCSR2 Description" on page 51.

a. Shaded areas are additions with respect to the MPC812/860ADS.

TABLE 4-13. BCSR2 Descriptiona

BIT

MNEMONIC

Function

PON

DEF

ATT.

0 - 3

FLASH_PD(4:1)

Flash Presence Detect(4:1). These lines are connected to the Flash SIMM

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

Flash SIMM socket. There are additional 3 presence detect lines which

encode the SIMM’s delay but appear in BCSR3. For the encoding of

FLASH_PD(4:1) see

TABLE 4-14. "Flash Presence Detect (4:1)

Encoding" on page 51.

-R

Reserved

Un-implemented

5 - 8

DRAM_PD(4:1)

Dram Presence Detect. These lines are connected to the DRAM SIMM

presence detect lines which encode the size and the delay of the DRAM

SIMM mounted on the DRAM SIMM socket. For the encoding of

DRAM_PD(4:1) see

TABLE 4-15. "DRAM Presence Detect (2:1)

Encoding" on page 52 and TABLE 4-16. "DRAM Presence Detect

(4:3) Encoding" on page 52.

-R

9 - 12

EXTTOLI(0:3)

External Tools Identiﬁcation. These lines, which are available at the

expansion connectors over the daughter board, are intended to serve as

tools’ identiﬁer or as S/W option selection. On board s/w may check these

lines to detect The presence of various tools (h/w expansions) at the

expansion connectors or the state of a dedicated 4 switches dip-switch

which resides over the same lines or a combination of both. Half of the

available combinations is reserved while the other half is available to users’

applications.

For

the

external

tools’

codes

and

their

associated

combinations see

TABLE 4-17. "EXTOOLI(0:3) Assignment" on page

52.

-R

13 - 15

DBREVN(0:2)

Daughter Board Revision Number (0:2). This ﬁeld represents the revision

code, hard-assigned to each daughter board. This is a production revision

which may be identical for different types of daughter boards. See

TABLE

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

page 53, for revisions’ encoding.

13 - 31

Reserved

Un-implemented.

TABLE 4-14. Flash Presence Detect (4:1) Encoding

FLASH_PD(4:1)

FLASH TYPE / SIZE

0 - 3

Reserved

SM732A2000 / SM73228 - 8 Mbyte SIMM, by SMART Modular Technologies.

SM732A1000A / SM73218 - 4 Mbyte SIMM, by SMART Modular

Technologies.

MCM29080 - 8 MByte SIMM, by Motorola

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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