参数资料
型号: DS21Q44T+
厂商: Maxim Integrated Products
文件页数: 26/105页
文件大小: 0K
描述: IC FRAMER ENHANCED E1 4X 128TQFP
标准包装: 72
控制器类型: E1 调帧器
接口: 并行/串行
电源电压: 2.97 V ~ 3.63 V
电流 - 电源: 75mA
工作温度: 0°C ~ 70°C
安装类型: 表面贴装
封装/外壳: 128-LQFP
供应商设备封装: 128-LQFP(14x20)
包装: 管件
DS21Q44
27 of 105
RCR1: RECEIVE CONTROL REGISTER 1 (Address=10 Hex)
(MSB)
(LSB)
RSMF
RSM
RSIO
FRC
SYNCE
RESYNC
SYMBOL
POSITION
NAME AND DESCRIPTION
RSMF
RCR1.7
RSYNC Multiframe Function. Only used if the RSYNC pin is
programmed in the multiframe mode (RCR1.6=1).
0 = RSYNC outputs CAS multiframe boundaries
1 = RSYNC outputs CRC4 multiframe boundaries
RSM
RCR1.6
RSYNC Mode Select.
0 = frame mode (see the timing in Section 18)
1 = multiframe mode (see the timing in Section 18)
RSIO
RCR1.5
RSYNC I/O Select. (note: this bit must be set to zero when
RCR2.1=0).
0 = RSYNC is an output (depends on RCR1.6)
1 = RSYNC is an input (only valid if elastic store enabled)
RCR1.4
Not Assigned. Should be set to zero when written.
RCR1.3
Not Assigned. Should be set to zero when written.
FRC
RCR1.2
Frame Resync Criteria.
0 = resync if FAS received in error 3 consecutive times
1 = resync if FAS or bit 2 of non–FAS is received in error 3
consecutive times
SYNCE
RCR1.1
Sync Enable.
0 = auto resync enabled
1 = auto resync disabled
RESYNC
RCR1.0
Resync. When toggled from low to high, a resync is initiated.
Must be cleared and set again for a subsequent resync.
Table 6-1. SYNC/RESYNC CRITERIA
FRAME OR
MULTIFRAME
LEVEL
SYNC CRITERIA
RESYNC CRITERIA
ITU SPEC.
FAS
FAS present in frame N and
N + 2, and FAS not present in
frame N + 1
Three consecutive incorrect
FAS received
Alternate (RCR1.2=1) the
above criteria is met or three
consecutive incorrect bit 2 of
non–FAS received
G.706
4.1.1
4.1.2
CRC4
Two valid MF alignment
words found within 8 ms
915 or more CRC4 code
words out of 1000 received in
error
G.706
4.2 and 4.3.2
CAS
Valid MF alignment word
found and previous timeslot
16 contains code other than all
zeros
Two consecutive MF
alignment words received in
error
G.732 5.2
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