参数资料
型号: WJLXT384LEB1
厂商: CORTINA SYSTEMS INC
元件分类: 数字传输电路
英文描述: DATACOM, PCM TRANSCEIVER, PQFP144
封装: 20 X 20MM, ROHS COMPLIANT, LQFP-144
文件页数: 98/140页
文件大小: 1514K
代理商: WJLXT384LEB1
60
Document Number: 248994
Revision Number: 005
Revision Date: November 28, 2005
Intel LXT384 Octal T1/E1/J1 S/H PCM Transceiver with JA
6.6
Jitter Attenuation
Figure 7 shows the internal LXT384 Transceiver jitter attenuation (JA) unit, which requires neither
an external crystal nor a reference clock that has a frequency higher than the line frequency.
Data signals are clocked into the FIFO with the associated clock signal (TCLKi or RCLKi) and are
clocked out of the FIFO with the JA clock after removing jitter (TCLKo when TCLKi is used, or
RCLKo when RCLKi is used). When the FIFO is within two bits of overflowing or underflowing,
the FIFO adjusts the output clock by 1/8 of a bit period. For the associated path, the JA produces a
constant throughput delay of either 16 bits (when a 32 x 2-bit register is used) or 32 bits (when a 64
x 2-bit register is used).
Figure 7. Jitter Attenuator
FIFO
Clock Recovery Unit
IN CLK
OUT CLK
TPOSi
RPOSi
TNEGi
RNEGi
TCLKi
RCLKi
JASEL0-1
TPOSo
RPOSo
TNEGo
RNEGo
TCLKo
RCLKo
JASEL0-1
FIFO64
MCLK
GCR control bits
x 32
IN
OUT
i = inputs
o = outputs
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