參數(shù)資料
型號： DS21Q44T+
廠商： Maxim Integrated Products
文件頁數(shù)： 47/105頁
文件大小： 0K
描述： IC FRAMER ENHANCED E1 4X 128TQFP
標準包裝： 72
控制器類型： E1 調幀器
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
供應商設備封裝： 128-LQFP（14x20）
包裝： 管件
DS21Q44
46 of 105
SYMBOL
POSITION
NAME AND DESCRIPTION
RCM3
CCR5.3
Receive Channel Monitor Bit 3.
RCM2
CCR5.2
Receive Channel Monitor Bit 2.
RCM1
CCR5.1
Receive Channel Monitor Bit 1.
RCM0
CCR5.0
Receive Channel Monitor Bit 0. LSB of the channel decode.
RDS0M: RECEIVE DS0 MONITOR REGISTER (Address = AB Hex)
(MSB)
(LSB)
B1
B2
B3
B4
B5
B6
B7
B8
SYMBOL
POSITION
NAME AND DESCRIPTION
B1
RDS0M.7
Receive DS0 Channel Bit 1. MSB of the DS0 channel (first
bit to be received).
B2
RDS0M.6
Receive DS0 Channel Bit 2.
B3
RDS0M.5
Receive DS0 Channel Bit 3.
B4
RDS0M.4
Receive DS0 Channel Bit 4.
B5
RDS0M.3
Receive DS0 Channel Bit 5.
B6
RDS0M.2
Receive DS0 Channel Bit 6.
B7
RDS0M.1
Receive DS0 Channel Bit 7.
B8
RDS0M.0
Receive DS0 Channel Bit 8. LSB of the DS0 channel (last bit
to be received).
10.
SIGNALING OPERATION
Each framer in the DS21Q44 contains provisions for both processor based (i.e., software based) signaling
bit access and for hardware based access. Both the processor based access and the hardware based access
can be used simultaneously if necessary. The processor based signaling is covered in Section 10.1 and
the hardware based signaling is covered in Section 10.2.
10.1 Processor-Based Signaling
The Channel Associated Signaling (CAS) bits embedded in the E1 stream can be extracted from the
receive stream and inserted into the transmit stream by the framer. Each of the 30 voice channels has four
signaling bits (A/B/C/D) associated with it. The numbers in parenthesis () are the voice channel
associated with a particular signaling bit. The voice channel numbers have been assigned as described in
the ITU documents. Please note that this is different than the channel numbering scheme (1 to 32) that is
used in the rest of the data sheet. For example, voice channel 1 is associated with timeslot 1 (Channel 2)
and voice Channel 30 is associated with timeslot 31 (Channel 32). There is a set of 16 registers for the
receive side (RS1 to RS16) and 16 registers on the transmit side (TS1 to TS16). The signaling registers
are detailed below.
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