cs5535 National Semiconductor Corporation, cs5535 Datasheet - Page 221

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

Revision 0.8
GLPCI_SB Register Descriptions
12:11
Bit
7:5
4:3
16
15
14
13
10
9
8
2
Name
LRH
RDHP
RSIDE
RPIDE
LEGACT
SDOFF
HCD
IOED
RSVD
(RO)
CISM
OD
IB/OB
IB/OB
OB
OB
IB
IB
IB
IB
IB
IB
IB
---
Description
Legacy I/O Retry/Hold.
0: Legacy I/O retry.
1: Legacy I/O hold.
Regardless of the above settings an I/O read or write to 1F0h always causes a retry if
data can not be immediately transferred.
Reject DMA High Page. Controls the decoding of I/O range associated with the DMA
High Page registers (480h-48Fh).
0: Considered part of legacy I/O.
1: Subtractive decode.
Reject Secondary IDE. Controls the decoding of I/O range associated with Secondary
IDE address of 170h-177h and 376h.
0: Considered part of legacy I/O.
1: Subtractive decode.
Reject Primary IDE. Controls the decoding of I/O range associated with Primary IDE
address of 1F0h-1F7h and 3F6h.
0: Considered part of legacy I/O.
1: Subtractive decode.
Legacy I/O Space Active Decode.
00: Subtractive decode (claim on fourth clock).
01: Slow decode (claim on third clock).
10: Medium decode (Claim on second clock).
11: Reserved (implemented as medium decode and returned 10 when read).
Non Legacy Subtractive Decode Off.
0: Subtractive decode enabled.
1: Subtractive decode disabled.
Hold for CIS Transfer Disable.
0: Hold for CIS transfer enabled.
1: Hold for CIS transfer disabled.
I/O Addressing Error Checking Disable.
0: I/O addressing error checking enabled.
1: I/O addressing error checking disabled.
Reserved (Read Only). Returns 0.
CIS Mode.
00: Mode A (Default). Not used in normal operation.
01: Mode B. Not used in normal operation.
10: Mode C. Used in normal operation.
11: Reserved.
See Section 4.2.14 "CPU Interface Serial (CIS)" on page 79 for details regarding opera-
tion modes.
Out-Bound Request Disable.
0: Out-bound request enabled.
1: Out-bound request disabled.
When an out-bound request is disabled, all outstanding out-bound requests are ser-
viced before a read response packet with SSMI bit and all data bits cleared and EXCEP
bit set is returned.
GLPCI_CTRL Bit Descriptions (Continued)
(Continued)
221
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