参数资料
型号: PM4314-RI
厂商: PMC-SIERRA INC
元件分类: 数字传输电路
英文描述: QUAD T1/E1 LINE INTERFACE DEVICE
中文描述: DATACOM, PCM TRANSCEIVER, PQFP128
封装: PLASTIC, QFP-128
文件页数: 134/170页
文件大小: 823K
代理商: PM4314-RI
PM4314 QDSX
DATA SHEET
PMC-950857
ISSUE 5
QUAD T1/E1 LINE INTERFACE DEVICE
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
122
FIFOBYP =1 or DJATTX =0 when XSEL[1] = 0, b) FIFOBYP = 1 or DJATTX =0
when XSEL[1:0] = 10, c) FIFOBYP=0 and DJATTX=1 but XSEL[1] = 1, d)
FIFOBYP = 1 or DJATTX =0 when XSEL[1:0] = 11, and e) FIFOBYP = 0 and
DJATTX =1 but XSEL[1:0] = 11.
12.3.1 FIFO not in Tx path, XSEL[1] = 0
When FIFOBYP =1 or DJATTX =0, but XSEL[1] = 0, a 24X clock must be
provided on XCLK. An 8X clock will be internally generated, either by dividing
XCLK by 3 (if XSEL[0] = 1) or synchronous to the PLL reference. (XSEL[0] = 0).
All quadrants on the QDSX share a single 8X clock, which is presented on
CLKO8X. TCLKI[4:1] must be synchronous to CLKO8X, and must satisfy the
setup and hold conditions specified in the A.C. Characteristics section.
12.3.2 FIFO not in Tx path, XSEL[1] = 1, XSEL[0] = 0.
When FIFOBYP =1 or DJATTX =0, but XSEL[1:0] = 10, a 8X clock must be
provided on XCLK. This 8X clock must be synchronous with TCLKI[4:1], and
TCLKI[4:1] must satisfy the setup and hold relationships to XCLK specified in the
A.C. Characteristics section.
12.3.3 FIFO is in Tx path, XSEL[1] = 1, XSEL[0] = 0.
When FIFOBYP = 0 and DJATTX = 1, but XSEL[1:0] = 10, then the DJAT FIFO is
used to buffer between TCLKI[4:1] and an XPLS transmit clock generated by
dividing down the system 8X clock. This arrangement guarantees the XPLS will
get the clocks it needs. In this case, the 8X clock (provided on XCLK) need only
be frequency locked to 8X the TCLKI[4:1] frequency. TCLKI[4:1] need not be
phase locked to the 8X clock in this case.
12.3.4 FIFO not in Tx path, XSEL[1] = 1, XSEL[0] = 1.
This setting is reserved.
12.3.5 FIFO is in Tx path, XSEL[1] = 1, XSEL[0] = 1.
This setting is reserved.
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