参数资料
型号: DS21FF44N
厂商: DALLAS SEMICONDUCTOR
元件分类: Digital Transmission Controller
英文描述: DATACOM, FRAMER, PBGA300
封装: 27 X 27 MM, BGA-300
文件页数: 42/110页
文件大小: 526K
代理商: DS21FF44N
DS21FT44/DS21FF44
37 of 110
SYMBOL
POSITION
NAME AND DESCRIPTION
RG802
CCR1.1
Receive G.802 Enable. See Section 22 for details.
0=do not force RCHBLK high during bit 1 of timeslot 26
1=force RCHBLK high during bit 1 of timeslot 26
RCRC4
CCR1.0
Receive CRC4 Enable.
0=CRC4 disabled
1=CRC4 enabled
FRAMER LOOPBACK
When CCR1.7 is set to a one, the framer will enter a Framer LoopBack (FLB) mode. See Figure 6–1 for
more details. This loopback is useful in testing and debugging applications. In FLB, the framer will
loop data from the transmit side back to the receive side. When FLB is enabled, the following will occur:
1. Data will be transmitted as normal at TPOS and TNEG.
2. Data input via RPOS and RNEG will be ignored.
3. The RCLK output will be replaced with the TCLK input.
CCR2: COMMON CONTROL REGISTER 2 (Address=1A Hex)
(MSB)
(LSB)
ECUS
VCRFS
AAIS
ARA
RSERC
LOTCMC
RFF
RFE
SYMBOL
POSITION
NAME AND DESCRIPTION
ECUS
CCR2.7
Error Counter Update Select. See Section 12 for details.
0=update error counters once a second
1=update error counters every 62.5 ms (500 frames)
VCRFS
CCR2.6
VCR Function Select. See Section 12 for details.
0=count BiPolar Violations (BPVs)
1=count Code Violations (CVs)
AAIS
CCR2.5
Automatic AIS Generation.
0=disabled
1=enabled
ARA
CCR2.4
Automatic Remote Alarm Generation.
0=disabled
1=enabled
RSERC
CCR2.3
RSER Control.
0=allow RSER to output data as received under all conditions
1=force RSER to one under loss of frame alignment conditions
LOTCMC
CCR2.2
Loss of Transmit Clock Mux Control. Determines whether
the transmit side formatter should switch to the ever present
RCLK if the TCLK should fail to transition (see Figure 6–1).
0=do not switch to RCLK if TCLK stops
1=switch to RCLK if TCLK stops
RFF
CCR2.1
Receive Force Freeze. Freezes receive side signaling at RSIG
(and RSER if CCR3.3=1); will override Receive Freeze Enable
(RFE). See Section 14 or details.
0=do not force a freeze event
1=force a freeze event
相关PDF资料
PDF描述
DS21FT40N DATACOM, FRAMER, PBGA300
DS21FT40 DATACOM, FRAMER, PBGA300
DS21FT42 DATACOM, FRAMER, PBGA300
DS21FT42N DATACOM, FRAMER, PBGA300
DS21FF42 DATACOM, FRAMER, PBGA300
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