cs5535 National Semiconductor Corporation, cs5535 Datasheet - Page 249

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

Revision 0.8
ATAC Register Descriptions
5.4.1.2
MSR Address
Type
Reset Value
63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
63:23
22:20
18:16
15:14
11:7
Bit
6:4
2:0
19
13
12
3
GeodeLink Device Master Configuration MSR (ATAC_GLD_MSR_CONFIG)
Name
RSVD
PRG_PREFETCH
PREFETCH_SEL
FIX_PREFETCH
DISCARD
NON_COH_WR
NON_COH_RD
RSVD
PRI
RSVD (RO)
PID
RSVD
51300001h
R/W
00000000_0000F000h
Description
Reserved. Reads as 0.
Programmable Prefetch Code. When bit 19 is set, these three bits determine the
prefetch policy for non-PRD read accesses. PRD read accesses use 001 setting.
000: No prefetch.
001: Prefetch 8 bytes.
010: Prefetch 16 bytes.
011: Prefetch 32 bytes.
100: Prefetch 32 bytes, additional 32 bytes prefetch after 16 bytes have been read.
All other values are reserved.
Prefetch Select. Select between fixed (when clear) or programmable prefetch policy
codes (when set).
Fixed Prefetch Code. When bit 19 is clear, these three bits determine the prefetch pol-
icy for all read accesses.
000: No prefetch.
001: Prefetch 8 bytes.
010: Prefetch 16 bytes.
011: Prefetch 32 bytes.
100: Prefetch 32 bytes, additional 32 bytes prefetch after 16 bytes have been read.
All other values are reserved.
Discard. Read prefetch discard policy.
00: Reserved.
01: Discard all data not taken under current local bus grant.
10: Discard all data on any local bus transaction.
11: Discard all data on any local bus write transaction. Always use this value. (Default)
Non-Coherent Write.
0: Write requests are coherent.
1: Write requests are non-coherent. Always use this value. (Default)
Non-Coherent Read.
0: Read requests are coherent.
1: Read requests are non-coherent. Always use this value. (Default)
Reserved. Reads as 0.
Priority Level. Always write 0.
Reserved (Read Only). Returns 0.
Priority ID. Always write 0.
PRG_PREF
ATAC_GLD_MSR_CONFIG Bit Descriptions
ATAC_GLD_MSR_CONFIG Register Map
ETCH
(Continued)
RSVD
249
RSVD
9
8
7
6
PRI
5
4
3
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2
PID
1
0