參數(shù)資料
型號： DS21Q44T+
廠商： Maxim Integrated Products
文件頁數(shù)： 38/105頁
文件大?。?/td> 0K
描述： IC FRAMER ENHANCED E1 4X 128TQFP
標準包裝： 72
控制器類型： E1 調(diào)幀器
接口： 并行/串行
電源電壓： 2.97 V ~ 3.63 V
電流 - 電源： 75mA
工作溫度： 0°C ~ 70°C
安裝類型： 表面貼裝
封裝/外殼： 128-LQFP
供應(yīng)商設(shè)備封裝： 128-LQFP（14x20）
包裝： 管件
DS21Q44
38 of 105
CRC4 SYNC COUNTER
The CRC4 Sync Counter increments each time the 8 ms CRC4 multiframe search times out. The counter
is cleared when the framer has successfully obtained synchronization at the CRC4 level. The counter can
also be cleared by disabling the CRC4 mode (CCR1.0=0). This counter is useful for determining the
amount of time the framer has been searching for synchronization at the CRC4 level. ITU G.706
suggests that if synchronization at the CRC4 level cannot be obtained within 400 ms, then the search
should be abandoned and proper action taken. The CRC4 Sync Counter will rollover.
SR1: STATUS REGISTER 1 (Address=06 Hex)
(MSB)
(LSB)
RSA1
RDMA
RSA0
RSLIP
RUA1
RRA
RCL
RLOS
SYMBOL
POSITION
NAME AND DESCRIPTION
RSA1
SR1.7
Receive Signaling All Ones / Signaling Change. Set when
over a full MF, the content of timeslot 16 contains less than
three zeros. This alarm is not disabled in the CCS signaling
mode. A change in the contents of RS1 through RS16 from one
multiframe to the next will cause RSA1 and RSA0 to be set.
RDMA
SR1.6
Receive Distant MF Alarm. Set when bit–6 of timeslot 16 in
frame 0 has been set for two consecutive multiframes. This
alarm is not disabled in the CCS signaling mode.
RSA0
SR1.5
Receive Signaling All Zeros / Signaling Change. Set when
over a full MF, timeslot 16 contains all zeros. A change in the
contents of RS1 through RS16 from one multiframe to the next
will cause RSA1 and RSA0 to be set.
RSLIP
SR1.4
Receive Side Elastic Store Slip. Set when the elastic store has
either repeated or deleted a frame of data.
RUA1
SR1.3
Receive Unframed All Ones. Set when an unframed all ones
code is received at RPOS and RNEG.
RRA
SR1.2
Receive Remote Alarm. Set when a remote alarm is received
at RPOS and RNEG.
RCL
SR1.1
Receive Carrier Loss. Set when 255 (or 2048 if CCR3.0=1)
consecutive zeros have been detected at RPOS and RNEG.
RLOS
SR1.0
Receive Loss of Sync. Set when the device is not synchronized
to the receive E1 stream.
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