Datasheet

Intel
®
E8870 Scalable Node Controller (SNC) Datasheet 3-29
Configuration Registers
3.8.9 FSBC: Processor Bus Control Register
3.8.10 FWHSEL: FWH Device Select
This register defines how the SNC translates addresses to IDSEL field for FWH cycles. This
register applies only to FWH devices. It has no effect if LPC flash devices are used.
Device: NodeID
Function: 0
Offset: 6Ch
Bit Attr Default Description
15 RW 0
BERRINDIS: BERRIN# Disable
If 0, SNC drives BERR# when BERRIN# is driven.
If 1, SNC never drives BERR#.
14:11 RV 0 Reserved
10 RW 0
SST: Anti-Starvation Service Entry Threshold
0 = The “service entry threshold” is 1. The first retry issued by the SNC while
in normal mode will be considered the “first retry” for service.
1 = The SNC will remain in watch mode until it retries a given agent 32
consecutive times.
9RW0
FEATEN: Feature Space Enable
This bit defines the value of A[22]# on the LPC/FWH interface.
If set, A[22]# should be 0. If clear A[22]# should be 1.
This bit must be set to allow access to 82802 Feature space to unlock blocks
so flash can be modified.
8RW0
16BEN: Enable 16-byte FWH Reads
If set, the SNC will perform 16-byte FWH reads for processor reads to local
firmware range with a length of 16 bytes or more.
If this bit is cleared, all local firmware reads will be performed as single-byte
reads.
7:5 RV 0 Reserved
4RW0
GSEQ# Drive Enable
When set, the SNC may assert GSEQ#.
3:0 RV 0 Reserved
Device: NodeID
Function: 0
Offset: 70h
Bit Attr Default Description
31:28 RW 0
IDSEL for F8 Range
IDSEL for the local firmware address range FFF8_0000h - FFFF_FFFFh.
27:24 RW 0
IDSEL for F0 Range
IDSEL for the local firmware address range FFF0_0000h - FFF7_FFFFh.
23:20 RW 0
IDSEL for E8 Range
IDSEL for the local firmware address range FFE8_0000h - FFEF_FFFFh.
19:16 RW 0
IDSEL for E0 Range
IDSEL for the local firmware address range FFE0_0000h - FFE7_FFFFh.