PC87591L datasheet(83/437 Pages) NSC

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4.0 Embedded Controller Modules (Continued)

Revision 1.07

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4.1.10 BIU Registers

For a summary of the abbreviations used for Register Type, see “Register Abbreviations and Access” on page 34.

BIU Register Map

BIU Conﬁguration Register (BCFG)

The BCFG register controls the configuration of common features to all zones. On reset, this register is initialized to 0716.

Location: Index 00 F98016

Type: R/W

Mnemonic

Type

BCFG

BIU Conﬁguration

R/W

IOCFG

I/O Zone Conﬁguration

R/W

SZCFGn

Static Zone Conﬁguration

R/W

Bit

76543210

Name

Reserved

ISTL

OBR

EWR

Reset

00000111

Bit

Description

EWR (Early Write).

0: Late write

1: Early write

OBR (Observability). Determines if the address and status of internal accesses are observable.

0: Not observable (no toggle of external buses)

1: Observable (external buses toggle)

ISTL (Internal Stall). Determines if the internal bus is stalled while the BIU is busy.

0: Internal bus activity not stalled when BIU is busy

1: Stall internal bus activity when the external bus is busy

7-3

Reserved.

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