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| 型號(hào)： | 935260699557 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類(lèi)： | 消費(fèi)家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP208 |
| 封裝： | PLASTIC, SOT-316, SQFP-208 |
| 文件頁(yè)數(shù)： | 19/148頁(yè) |
| 文件大?。?/td> | 692K |
| 代理商： | 935260699557 |
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1998 Apr 09
115
Philips Semiconductors
Product specication
Multimedia bridge, high performance
Scaler and PCI circuit (SPCI)
SAA7146A
Table 100 Feedback buffers
Under control of the time slot list, a collected Dword is then stored into the input FIFO. The FIFO size is determined to
24 Dwords.
An audio sampling frequency of fs = 48 kHz and n = 16 time slots in a super frame results in a maximum data load for
the PCI from an audio capture DMA channel of 768 kbytes/s (the bit clock rate is 6144 kbit/s). That accounts for
approximately 13 Dwords per regular video line time. To generate audio output signals, a master read DMA control fills
the output FIFO. A Dword buffer is loaded from FIFO under control of the time slot list. The parallel-to-serial converter
takes a byte as programmed in the time slot list from one of the 8 buffer places; 4 in the Dword buffer and 4 in the
feedback buffer. The serial output is directed to one of the accessible SD pins. Positive and negative clock edge data
transmission is supported by optional BCLK inversion.
Each record in the time slot list describes, how the bytes appearing on the port, are mapped to the Dword wide DMA
channels, respectively to the feedback or input buffers. A time slot list record consists of 4 bytes. As up to 32 time slots
are supported, the time slot list is comprised of 16 Dwords of programming for each audio interface circuit A1 or A2 which
can be linked together.
OFFSET
NAME
BIT
TYPE
DESCRIPTION
144H
FB_BUFFER1
31 to 0
RW
feeds back audio data or stores status/control informations
148H
FB_BUFFER2
31 to 0
RW
feeds back audio data or stores status/control informations
Fig.41 Audio data path components.
handbook, full pagewidth
MGG282
WS4 WS3 WS2 WS1 WS0
43 2 1 0
4 3 2 1 0
SD4
WS
SD
WS
SD
SD3
SD2
SD1
SD0
FIFO1
IN
OUT
FIFO2
TSL2
A2
TSL1
A1
FIFO2
IN
OUT
I/O CONTROL
DATAFLOW CONTROL
A1
43 2 1 0
4 3 2 1 0
DATAFLOW CONTROL
A2
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