参数资料
型号: DS21Q42T+
厂商: Maxim Integrated Products
文件页数: 58/116页
文件大小: 0K
描述: IC FRAMER ENHANCED T1 4X 128TQFP
标准包装: 72
控制器类型: T1 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
DS21Q42
46 of 116
Path Code Violation Count Register
(PCVCR) When the receive side of a framer is set to operate in the ESF framing mode (CCR2.3=1),
PCVCR will automatically be set as a 12–bit counter that will record errors in the CRC6 code words.
When set to operate in the D4 framing mode (CCR2.3=0), PCVCR will automatically count errors in the
Ft framing bit position. Via the RCR2.1 bit, a framer can be programmed to also report errors in the Fs
framing bit position. The PCVCR will be disabled during receive loss of synchronization (RLOS=1)
conditions. See Table 8-2 for a detailed description of exactly what errors the PCVCR counts.
PCVCR1: PATH VIOLATION COUNT REGISTER 1 (Address = 25 Hex)
PCVCR2: PATH VIOLATION COUNT REGISTER 2 (Address = 26 Hex)
(MSB)
(LSB)
(note 1)
CRC/
FB11
CRC/
FB10
CRC/
FB9
CRC/
FB8
PCVCR1
CRC/
FB7
CRC/
FB6
CRC/
FB5
CRC/
FB4
CRC/
FB3
CRC/
FB2
CRC/
FB1
CRC/
FB0
PCVCR2
SYMBOL
POSITION
NAME AND DESCRIPTION
CRC/FB11
PCVCR1.3
MSB of the 12–Bit CRC6 Error or Frame Bit Error
Count (note#2)
CRC/FB0
PCVCR2.0
LSB of the 12–Bit CRC6 Error or Frame Bit Error Count
(note#2)
NOTES:
1) The upper nibble of the counter at address 25 is used by the Multiframes Out of Sync Count Register.
2) PCVCR counts either errors in CRC code words (in the ESF framing mode; CCR2.3 = 1) or errors in
the framing bit position (in the D4 framing mode; CCR2.3 = 0).
Table 8-2. PATH CODE VIOLATION COUNTING ARRANGEMENTS
FRAMING MODE
(CCR2.3)
COUNT Fs ERRORS?
(RCR2.1)
WHAT IS COUNTED IN THE
PCVCRs
D4
no
errors in the Ft pattern
D4
yes
errors in both the Ft & Fs patterns
ESF
don’t care
errors in the CRC6 code words
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