SAA7785 Datasheet, PDF (58/68 Pages) NXP Semiconductors – ThunderBird Avenger PCI Audio Accelerator

Philips Semiconductors
ThunderBird Avenger^TM PCI Audio
Accelerator
Preliminary Specification
SAA7785
Bit
5
4
3
2
1
0
Name
SNOOP_ENB
MEM_INV_EN
SPEC_CNTL
MAST_CNTL
MEM_CNTL
IO_CNTL
R/W
RO
RO
RO
RO
RO
RW
Function
VGA Snoop Enable. The SSA7785 ThunderBird Avenger™, function 2 does
not support VGA snoop enable, therefor this bit always returns a zero.
Memory Write and Invalidate Enable: Always returns 0.
Special Cycle Control: Controls the devices ability to respond to Special
Cycle Operations. A value of 0 causes the SSA7785 ThunderBird Avenger™,
function 2 to ignore all Special Cycles.
Master Control: The SSA7785 ThunderBird Avenger™, function 2 does not
have any master functions.
Memory Response Control: The SSA7785 ThunderBird Avenger™, function 2
does not support target memory cycles therefore this bit always returns a
zero.
I/O Response Control: Controls the SSA7785 ThunderBird Avenger™, func-
tion 2’s response to I/O space. A value of 0 disables the device response. A
value of 1 allows the device to respond to I/O space accesses.
TABLE 55 Status Register - STATUS (RO/RW)
PCI CFG 2
Offset 06h
POR Value
D15
D14
R_PERR S_SERR
0
0
D13
SM_
ABORT
0
D12
RT_
ABORT
0
D11
ST_
ABORT
0
D10
D9
DEVSEL_TMG
0
1
D8
S_PERR
0
D7
D6
D5
D4
D3
D2
D1
D0
F_
UDF
MHz66
R
R
R
R
R
BK2BK
POR Value
1
0
0
0
0
0
0
0
Bit
15
Name
R_PERR
14
S_SERR
13
SM_ABORT
12
RT_ABORT
R/W
Function
RC Received Parity Error: When set to 1, this bit indicates that the SSA7785
ThunderBird Avenger™, function 2 has detected a PCI bus parity error at
least once since this bit was last reset.
RC Signalled System Error: When set to 1, this bit indicates that the SSA7785
ThunderBird Avenger™, function 2 has reported a system error on the
SERR# signal at least once since this bit was last reset.
RO Signalled Master Abort: The SSA7785 ThunderBird Avenger™, function 2,
does not act as a master.
RO Received Target Abort: The SSA7785 ThunderBird Avenger™, function 2
does not act as a master.
1999 Nov 12
58