82801BA Datasheet, PDF (48/498 Pages) Intel Corporation – Intel 82801BA I/O Controller Hub 2 (ICH2) and Intel 82801BAM I/O Controller Hub 2 Mobile

Signal Description
2.17 AC’97 Link
Table 2-17. AC’97 Link Signals
Name
Type
Description
AC_RST#
O AC97 Reset: Master H/W reset to external Codec(s)
AC_SYNC
O AC97 Sync: 48 KHz fixed rate sample sync to the Codec(s)
AC_BIT_CLK
I
AC97 Bit Clock: 12.288 MHz serial data clock generated by the external
Codec(s). See Note.
AC_SDOUT
AC97 Serial Data Out: Serial TDM data output to the Codec(s)
O _{Note: AC_SDOUT is sampled at the rising edge of PWROK as a functional}
strap. See Section 2.20.1 for more details.
AC_SDIN[1:0]
I
AC97 Serial Data In 0: Serial TDM data inputs from the Codecs. See Note.
NOTE: If the ACLINK Shutoff bit in the AC’97 Global Control Register (See Section 13.2.8) is set to 1, internal
pull-down resistors will be enabled on AC_BIT_CLK and AC_SDATA_IN[1:0]. If ACLINK Shutoff is
cleared to 0, these pull-down resistors are disabled. If there is no codec down on the system board, the
two signals AC_SDIN[1:0] should be pulled down externally with a resistor to ground.
2.18 General Purpose I/O
Table 2-18. General Purpose I/O Signals
Name
Type
Description
GPIO[31:29]
GPIO[28:27]
GPIO[26]
GPIO[25]
GPIO[24]
(ICH2 only)
GPIO[23]
(ICH2 only)
GPIO[22]
(ICH2 only)
GPIO[21]
GPIO[20:18]
(ICH2 only)
GPIO[17:16]
GPIO[15:14]
GPIO[13:12]
GPIO[11]
GPIO[10:9]
GPIO[8]
GPIO[7]
GPIO[6]
(ICH2 only)
O Not implemented.
I/O Can be input or output. Resume power well. Unmuxed.
I/O Not implemented.
I/O Can be input or output. Resume power well. Not Muxed.
I/O Can be input or output. Resume power well.
O Fixed as Output only. Main power well.
OD Fixed as Output only. Main power well. Open-drain output.
O Fixed as Output only. Main power well.
O Fixed as Output only. Main power well.
Fixed as Output only. Main Power Well. Can instead be used for PC/PCI
O GNT[A:B]#. GPIO[17] can also alternatively be used for PCI GNT[5]#. Integrated
pull-up resistor.
I
Not implemented.
I
Fixed as Input only. Resume Power Well. Not muxed.
I
Fixed as Input only. Resume Power Well. Can instead be used for SMBALERT#.
I
Not implemented.
I
Fixed as Input only. Resume Power Well. Not muxed.
I
Fixed as Input only. Main power well. Not muxed.
I
Fixed as Input only. Main power well.
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82801BA ICH2 and 82801BAM ICH2-M Datasheet