pc87591l National Semiconductor Corporation, pc87591l Datasheet - Page 83

• Manufacturer Part Number: pc87591l
• Description: Lpc Mobile Embedded Controllers
• Manufacturer: National Semiconductor Corporation

Revision 1.07
4.0 Embedded Controller Modules
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 07
Location: Index 00 F980
Type: R/W
Bit
Name
Reset
7-3
Bit
0
1
2
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
Reserved.
7
0
Mnemonic
SZCFGn Static Zone Configuration
IOCFG
BCFG
16
BIU Configuration
I/O Zone Configuration
6
0
Reserved
5
0
(Continued)
Register Name
Description
83
4
0
3
0
ISTL
2
1
Type
R/W
R/W
R/W
OBR
1
1
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EWR
0
1
16
.