82C931 Datasheet, PDF (23/64 Pages) List of Unclassifed Manufacturers – Plug and Play Integrated Audio Controller

82C931
931-AD Mode Signal Descriptions (cont.)
3.3.1.3 Configuration, External PnP EEPROM, and IDE CD-ROM Interface Signals
Signal Name
ROMCS
PNPEN
GPIO1
MODE0
CA2
ROMCLK
IDEDIS#
CA1
ROMDOUT
CA0
ROMDIN
IDECS1#
IDECS3#
IDEIRQ
GPIO2
RESET#
CDOE#
CDHOE#
XIOR#
XIOW#
Pin No.
12
11
35
36
37
38
39
41
34
44
45
32
33
Signal/Pin
Type (Drive)
I/O-TTL, PU
(8mA)
I/O-TTL, PU
(8mA)
I/O-TTL, PD
(12mA)
I/O-TTL, PD
(12mA)
I/O-TTL, PD
(12mA)
O-TTL
(12mA)
O-TTL
(12mA)
I/O-TTL
(12mA)
O
(12mA)
O-TTL
(8mA)
O-TTL
(8mA)
O-TTL
(12mA)
O-TTL
(12mA)
Signal Description
External Serial EEPROM Chip Select
PNP Mode Enable Jumper Input: Jumper setting is latched at power-
on reset. This pin has an internal pull-up. Jumper pull-up: enable
(default), pull-down: disable.
General Purpose I/O Bit 1
931 Mode Configuration Bit 0: This pin is used to configure the
82C931 in either the 931-MB or 931-AD mode (refer to Table 3-1).
These settings are latched into the 82C931 at reset.
IDE CA2: Buffered SA2 for CD-ROM
External Serial EEPROM Clock
IDE Disable: Jumper selection to disable IDE resource. No connect
equals IDE enabled. Pull down equals IDE disabled. (Available in revi-
sion 1.1 silicon only.)
IDE CA1: Buffered SA1 for CD-ROM.
External Serial EEPROM Data Out
IDE CA0: Buffered SA0 for CD-ROM.
External Serial EEPROM Data In
IDE CD-ROM Chip Select Bit 1: CD-ROM chip select for address
decode range 0170h through 0177h.
IDE CD-ROM Chip Select Bit 3: CD-ROM chip select for ISA address
decode range 0376h through 0377h.
IDE CD-ROM Interrupt: Interrupt input from IDE CD-ROM which redi-
rect to IRQ5, 7, 9, 10, 11, 15 according to PNP logic.
General Purpose I/O Bit 2
Buffered Reset (active low)
CD Output Enable: Enables low-order [7:0] of the CD data buffer.
CD High Output Enable: Enables high-order [15:8] of CD data buffer.
IDE Buffered IOR#
IDE Buffered IOW#
912-3000-035
Revision: 2.1
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