cs5535 National Semiconductor Corporation, cs5535 Datasheet - Page 422

• Manufacturer Part Number: cs5535
• Description: Geode Cs5535 Companion Multi-function South Bridge
• Manufacturer: National Semiconductor Corporation

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RTC Register Descriptions
5.15.1 RTC Specific MSRs
5.15.1.1
MSR Address
Type
Reset Value
When a non-reserved bit is set to 1, it can only be cleared by hardware reset.
5.15.1.2
MSR Address
Type
Reset Value
BLK_STDRAM BLK_RAM_WR BLK_XRAM_WR BLK_XRAM_RD
Bit
2:0
7
6
5
4
3
RSVD
7
7
RTC RAM Lock (RTC_RAM_LOCK)
RTC Date of Month Alarm Offset (RTC_DOMA_OFFSET)
Name
BLK_STDRAM
BLK_RAM_WR
BLK_XRAM_WR
BLK_XRAM_RD
BLK_XRAM
RSVD
51400054h
R/W
00h
51400055h
R/W
00h
6
6
Description
Block Standard RAM.
0: No effect on Standard RAM access (default).
1: Read and write to locations 38h-3Fh of the Standard RAM are blocked, writes
Block RAM Write.
0: No effect on RAM access (default).
1: Write to RAM (Standard and Extended) are ignored.
Block Extended RAM Write. This bit controls write to bytes 00h-1Fh of the Extended
RAM.
0: No effect on Extended RAM access (default).
1: Writes to byte 00h-1Fh of the Extended RAM are ignored.
Block Extended RAM Read. This bit controls read from bytes 00h-1Fh of the
Extended RAM.
0: No effect on Extended RAM access (default).
1: Reads from byte 00h-1Fh of the Extended RAM are ignored.
Block Extended RAM. This bit controls access to the Extended RAM 128 bytes.
0: No effect on Extended RAM access (default).
1: Read and write to the Extended RAM are blocked; writes are ignored and reads
Reserved. Write as 0.
ignored, and reads return FFh.
return FFh.
5
5
(Continued)
RTC_DOMA_OFFSET Register Map
RTC_RAM_LOCK Bit Descriptions
RTC_RAM_LOCK Register Map
4
4
422
DOMA_OFST
BLK_XRAM
3
3
2
2
RSVD
1
1
Revision 0.8
0
0