參數(shù)資料
型號: ZR36504
廠商: Electronic Theatre Controls, Inc.
英文描述: Video & Audio Interface solution via USB
中文描述: 視頻
文件頁數(shù): 67/74頁
文件大?。?/td> 298K
代理商: ZR36504
ZORAN Corporation
USBvision II Data Decoder
ZR36505 Data Sheet
November-99
Page 67 of 67
The Codec Interface is Long Frame Sync Timing based. The BCLK frequency can be
selected to be - 2048KHz, 1536KHz, or 64KHz, which enables the designer to use almost
any family of low cost Codecs available in market.
In the Long Frame Sync Timing modes, the MSb of the "transmitted" data is always
expected soon after the rising edge of the FS_L (or FS_R) signal. The ZR36504 produces
a positive pulse of 2 BCLK cycles in these output pins every 125us (8KHz) or every 62.5us
(16KHz), which indicates the start of sample as specified in the following waveform
diagram:
MSb
LSb
Txs
Txd1
Txd2
Tsx
BCLK
FS_L
FS_R
DAT_IN
XX
XX
The BCLK is derived out of the 12MHz clock from the crystal. This results in a 4.3% jitter
at the BCLK signal.
The following table specifies the minimum and maximum time intervals for the Codec
Interface waveform diagram:
Parameter
Symbol
Min
Max
Unit
Hold Time from BCLK Low to FS_L / FS_R High
Txs
180
-
ns
Setup Time from FS_L / FS_R High to BCLK Low
Tsx
180
-
ns
Delay Time to valid data from FS_L / FS_R
Txd1
-
200
ns
Delay Time from BCLK High to DAT_IN valid
Txd2
-
200
ns
Jitter at the Bit Clock signal BCLK
Cj
-
4.3
%
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