AMD Geode LX 800@0.9W - Manual (Page 159)

AMD Geode™ LX Processors Data Book 159
CPU Core Register Descriptions 33234H
5.5.2.63 Data Memory Subsystem Configuration 0 MSR (DM_CONFIG0_MSR)
MSR Address 00001800h
Type R/W
Reset Value 00000000_00000000h
DM_CONFIG0_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
SNOO
PT
O
RS
V
D
WSREQ
RS
V
D
WCTO
RS
V
D
WBTO RSVD
WBDIS
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
LSLOCK
NOLO
C
K
EVCT
EVCT
O
NRPL
NO
F
TTBR
E
S
DTC
N
INV
P4MDIS DTC
D
IS
L2TD
IS
D
CDIS
SPCDEC WTBRST WBINVD NOSMC NOFWD BLO
C
KC
MISSER LDSER
DM_CONFIG0_MSR Bit Descriptions
Bits Name Description
63:49 RSVD Reserved. (Default = 0)
48 SNOOPTO Snoop Timeout. Allow DM to escape a snoop deadlock by timing out a snoop request to
the DM tag machine.
0: Disable.
1: Enable. (Default)
47 RSVD Reserved. (Default = 0)
46:44 WSREQ Number of Outstanding Write-Serialized Requests. The system must be able to
accept WSREQ+1 cacheline + 2-4 QWORD writes without backing up the bus controller
to prevent a lockup condition in the event of an inbound snoop hit.
000: Unlimited. (Default)
001-111: Binary value.
43 RSVD Reserved. (Default = 0)
42:40 WCTO Write-Combine Timeout. Flushes write-combinable entry from write buffer if it has not
been written for the specified number of clocks.
000: Disable timeout. (Default)
001-111: 2**(4 + WCTO) clocks (32, 64, ..., 2048).
39 RSVD Reserved. (Default = 0)
38:36 WBTO Write-Burst Timeout. Flushes write-burstable entry from write buffer if it has not been
written for the specified number of clocks.
000: Disable timeout. (Default)
001-111: 2**(4 + WBTO) clocks (32, 64, ..., 2048).
35:33 RSVD Reserved. (Default = 0)