G1-266P-85-1.8
| Model | G1-266P-85-1.8 |
| Description | Processor Series Low Power Integrated x86 Solution |
| PDF file | Total 247 pages (File size: 4M) |
| Chip Manufacturer | NSC |
Geode™ GX1 Processor Series
Processor Programming
(Continued)
Table 3-11. Configuration Registers
Bit
Index C1h
7:3
2
RSVD
SMAC
Name
Description
CCR1 — Configuration Control Register 1 (R/W)
Reserved:
Set to 0.
System Management Memory Access:
If = 1: SMINT instruction can be recognized.
If = 0: SMINT instruction has no affect.
SMI_LOCK (CCR3[0]) must = 0, or the CPU must be in SMI mode, to write this bit.
1
USE_SMI
Enable SMM Pins:
If = 1: SMI# input pin is enabled. SMINT instruction can be recognized.
If = 0: SMI# pin is ignored.
SMI_LOCK (CCR3[0]) must = 0, or the CPU must be in SMI mode, to write this bit.
0
Note:
RSVD
Reserved:
Set to 0.
Bits 1 and 2 are cleared to zero at reset.
CCR2 — Configuration Control Register 2 (R/W)
USE_SUSP
Enable Suspend Pins:
If = 1: SUSP# input and SUSPA# output are enabled.
If = 0: SUSP# input is ignored.
6
5
4
RSVD
RSVD
WT1
Reserved:
This is a test bit that must be set to 0.
Reserved:
Set to 0.
Write-Through Region 1:
If = 1: Forces all writes to the address region between 640 KB to 1 MB that hit in the on-chip cache to
be issued on the external bus.
3
2
SUSP_HLT
LOCK_NW
Suspend on HALT:
If = 1: CPU enters Suspend mode following execution of a HALT instruction.
Lock NW Bit:
If = 1: Prohibits changing the state of the NW bit (CR0[29]) (refer to Table 3-7 on page 49).
Set to 1 after setting NW.
1:0
Note:
RSVD
Reserved:
Set to 0.
All bits are cleared to zero at reset.
CCR3 — Configuration Control Register 3 (R/W)
LSS_34
LSS_23
LSS_12
MAPEN
Load/Store Serialize 3 GB to 4 GB:
If = 1: Strong R/W ordering imposed in address range C0000000h to FFFFFFFFh:
6
5
4
Load/Store Serialize 2 GB to 3 GB:
If = 1: Strong R/W ordering imposed in address range 80000000h to BFFFFFFFh:
Load/Store Serialize 1 GB to 2 GB:
If = 1: Strong R/W ordering imposed in address range 40000000h to 7FFFFFFFh
Map Enable:
If = 1: All configuration registers are accessible. All accesses to I/O Port 22h are trapped.
If = 0: Only configuration registers Index C1h-C3h, CDh-CFh FEh, FFh (CCRn, SMAR, DIRn) are
accessible. Other configuration registers (including PCR, SMHRn, GCR, VGACTL, VGAM0) are not
accessible.
3
SUSP_SMM_EN
Enable Suspend in SMM Mode:
If 0 = SUSP# ignored in SMM mode.
If 1 = SUSP# recognized in SMM mode.
2
1
RSVD
NMI_EN
Reserved:
Set to 0.
NMI Enable:
If = 1: NMI is enabled during SMM.
If = 0: NMI is not recognized during SMM.
SMI_LOCK (CCR3[0]) must = 0 or the CPU must be in SMI mode to write to this bit.
Default Value = 00h
Default Value = 00h
Default Value = 00h
Index C2h
7
Index C3h
7
www.national.com
52
Revision 1.0
