CMI8788 Datasheet, PDF (12/29 Pages) C-Media Electronics – High Performance PCI Audio Processor

C-Media High Performance PCI Audi o Controller
Oxygen^TMHD CMI8788 Datasheet v0 .6
3.2 Pin Descriptions
The following table gives the pin descriptions for the Oxygen^TMHD CMI8788.
Some of the pins perform multiple functions, so for the sake of consistency, a pin may
be listed more than once in the table. The abbreviations used in the pin description table
are expla ined below.
DI: digital input signal
DO: digital output signal
DIO: digital bidirectional signal
AI: analog input
PU: pull- up with 75K resistor
PD: pull-down with 75K resistor
#: low active signal
Table 3.1 Pin description table of Oxygen^TMHD CMI8788
Symbol
XRST
XCLK33
XIDSEL
XGNT#
XREQ#
XAD[31:0]
XCB#[3:0]
XFRAME#
XDEVSEL#
XIRDY#
XTRDY#
Pin No. Type
Description
PCI Bus Interface
119
DI PCI Bus Reset.
120
DI PCI Bus clock, 33MHz.
5
DI ^{PCI Initialization Device Select. This is the chip select during PCI}
configuration access.
121
DI PCI Bus Grant. When active, PCI bus master is granted to
CMI8788.
122
1-3, 7-11,
13-15, 25, 27,
28-31, 33,
35-38, 40-44,
123-126, 128
DIO ^{PCI Bus Master Request. When active, the CMI8788 is requesting}
to become a bus master.
DIO ^{PCI Address / Data Bus}
4, 16, 24, 34 DIO PCI Bus Command / Byte Enable
17
DIO ^{PCI Cycle Frame. It is driven by the current master to indicate the}
beginning and duration of an access
21
DIO ^{PCI Device Select. When active, indicates that the driving device}
has decoded its address as the target of the current access.
18
DIO ^{PCI Initiator Ready. When active, indicates that the initiator can}
complete the current data phase of the transaction.
20
DIO ^{PCI Target Ready. When active, indicates the target device can}
complete the current data phase of the transaction.
11
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