AMD Geode LX 800@0.9W - Manual (Page 115)

AMD Geode™ LX Processors Data Book 115
CPU Core Register Descriptions 33234H
5.5.2.9 Instruction Fetch Configuration MSR (IF_CONFIG_MSR)
IF_CONFG_MSR controls the operation of the Instruction Fetch (IF). The Level-0 COF cache (Change of Flow (COF)
cache), L1 COF cache, return stack, and power saving mode may be turned on or off. The WRMSR instruction can access
IF_CONFIG MSR at any time. Devices external to the CPU should issue writes to IF_CONFIG MSR only if the CPU is sus-
pended or stalled.
MSR Address 00001100h
Type R/W
Reset Value 00000000_00005051h
IF_CONFIG_MSR Register Map
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
RSVD
BETD BIVD
LSNPD PSNPD
RSVD BSP
RS
V
D W_DIS
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
RSVD
II_NS
RSVD
CC
_SE
R RSVD
R
Q
_SER
RSVD
II_
S
E
R
RS
V
D
II_IMF
L
SH
RS
V
D
CC_
L0
RS
V
D
DMM_
DIS
RS
V
D
CC
_PS
RS
V
D
STR
O
NG
RS
V
D
RS
RS
V
D
CC_
INVL
RS
V
D
CC_
L1
IF_CONFIG_MSR Bit Descriptions
Bit Name Description
63:48 RSVD Reserved.
47 BETD Branch Tree Messaging (BTM) Exception Type. Allow the BTM stream to contain
exception type records.
0: Enable. (Default)
1: Disable.
46 BIVD Branch Tree Messaging Interrupt Vector. Allow the BTM stream to contain interrupt
vector records.
0: Enable. (Default)
1: Disable.
45 LSNPD Linear Snooping.
0: Enable. (Default)
1: Disable.
44 PSNPD Physical Snooping.
0: Enable. (Default)
1: Disable.
43:41 RSVD Reserved.
40:37 BSP Branch Tree Messaging Sync Period. Specifies the maximum period between BTM
synchronization records. If BSP is non-zero, the IF will insert a synchronization record
into the BTM stream whenever it sees a series of 32*BSP non-synchronization records.
(Default = 0)
36 RSVD Reserved.
35:32 W_DIS Branch Target Buffer (BTB) Way. Each bit is used to disable one Way of the BTB. Bit
32 = Way 0, bit 33 = Way 1, bit 34 = Way 2, and bit 35 = Way 3.
0: Enable Way. (Default)
1: Disable Way.
31:29 RSVD Reserved.