参数资料
型号: DS21Q42TN
厂商: DALLAS SEMICONDUCTOR
元件分类: Digital Transmission Controller
英文描述: DATACOM, FRAMER, PQFP128
封装: TQFP-128
文件页数: 47/119页
文件大小: 1309K
代理商: DS21Q42TN
DS21Q42
33 of 119
SYMBOL
POSITION
NAME AND DESCRIPTION
RZSE
CCR2.0
Receive FDL Zero Destuffer Enable. Set this bit to zero if using
the internal HDLC/BOC controller instead of the legacy support for
the FDL. See Section 15 for details.
0 = zero destuffer disabled
1 = zero destuffer enabled
CCR3: COMMON CONTROL REGISTER 3 (Address=30 Hex)
(MSB)
LSB)
RESMDM
TCLKSRC
RLOSF
RSMS
PDE
ECUS
TLOOP
TESMDM
SYMBOL
POSITION
NAME AND DESCRIPTION
RESMDM
CCR3.7
Receive Elastic Store Minimum Delay Mode. See Section 13 for
details.
0 = elastic stores operate at full two frame depth
1 = elastic stores operate at 32–bit depth
TCLKSRC
CCR3.6
Transmit Clock Source Select. This function allows the user to
internally select RCLK as the clock source for the transmit side
formatter.
0 = Transmit side formatter clocked with signal applied at TCLK
pin.
LOTC Mux function is operational (TCR1.7)
1 = Transmit side formatter clocked with RCLK.
RLOSF
CCR3.5
Function of the RLOS/LOTC Output. Active only when FMS = 1
(DS21Q41 emulation).
0 = Receive Loss of Sync (RLOS)
1 = Loss of Transmit Clock (LOTC)
RSMS
CCR3.4
RSYNC Multiframe Skip Control. Useful in framing format
conversions from D4 to ESF. This function is not available when
the receive side elastic store is enabled.
0 = RSYNC will output a pulse at every multiframe
1 = RSYNC will output a pulse at every other multiframe note: for
this
bit to have any affect, the RSYNC must be set to output multiframe
pulses (RCR2.4=1 and RCR2.3=0).
PDE
CCR3.3
Pulse Density Enforcer Enable.
0 = disable transmit pulse density enforcer
1 = enable transmit pulse density enforcer
ECUS
CCR3.2
Error Counter Update Select. See Section 8 for details.
0 = update error counters once a second
1 = update error counters every 42 ms (333 frames)
TLOOP
CCR3.1
Transmit Loop Code Enable. See Section 16 for details.
0 = transmit data normally
1 = replace normal transmitted data with repeating code as defined
in TCD register
相关PDF资料
PDF描述
DS21Q42T DATACOM, FRAMER, PQFP128
DS21Q43AT DATACOM, FRAMER, PQFP128
DS21Q44T DATACOM, FRAMER, PQFP128
DS21Q44TN DATACOM, FRAMER, PQFP128
DS21Q48N DATACOM, PCM TRANSCEIVER, PBGA144
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