876784 Intel, 876784 Datasheet - Page 752
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876784
Manufacturer Part Number
876784
Description
Manufacturer
Intel
Datasheet
1.876784.pdf
(848 pages)
Specifications of 876784
Lead Free Status / RoHS Status
Compliant
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19.2.37
752
SDSTS—Stream Descriptor Status Register
(Intel
Memory Address:Input Stream[0]: HDBAR + 83h
Default Value:
7:6
1:0
Bit
5
4
3
2
Reserved.
FIFO Ready (FIFORDY) — RO.
For output streams, the controller hardware will set this bit to 1 while the output DMA
FIFO contains enough data to maintain the stream on the link. This bit defaults to 0 on
reset because the FIFO is cleared on a reset.
For input streams, the controller hardware will set this bit to 1 when a valid descriptor
is loaded and the engine is ready for the RUN bit to be set.
Descriptor Error — R/WC.
0 = No error detected.
1 = A serious error occurred during the fetch of a descriptor. This could be a result of a
NOTE: Software may attempt to restart the stream engine after addressing the cause
FIFO Error — R/WC. The bit is cleared by writing a 1 to it.
0 = No error detected.
1 = FIFO error occurred. This bit is set even if an interrupt is not enabled.
For an input stream, this indicates a FIFO overrun occurring while the RUN bit is set.
When this happens, the FIFO pointers do not increment and the incoming data is not
written into the FIFO, thereby being lost.
For an output stream, this indicates a FIFO underrun when there are still buffers to
send. The hardware should not transmit anything on the link for the associated stream
if there is not valid data to send.
Buffer Completion Interrupt Status — R/WC.
0 = Last sample of a buffer has Not been processed as described below.
1 = Set to 1 by the hardware after the last sample of a buffer has been processed, AND
Reserved.
®
High Definition Audio Controller—D27:F0)
Master Abort, a parity or ECC error on the bus, or any other error which renders
the current Buffer Descriptor or Buffer Descriptor list useless. This error is treated
as a fatal stream error, as the stream cannot continue running. The RUN bit will be
cleared and the stream will stop.
if the Interrupt on Completion bit is set in the command byte of the buffer
descriptor. It remains active until software clears it by writing a 1 to it.
of the error and writing a 1 to this bit to clear it.
Input Stream[1]: HDBAR + A3h
Input Stream[2]: HDBAR + C3h
Input Stream[3]: HDBAR + E3h
Output Stream[0]: HDBAR + 103h
Output Stream[1]: HDBAR + 123h
Output Stream[2]: HDBAR + 143h
Output Stream[3]: HDBAR + 163h
00h
Intel® High Definition Audio Controller Registers (D27:F0)
Description
Attribute:
Size:
Intel
®
8 bits
ICH7 Family Datasheet
R/WC, RO
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