參數(shù)資料
型號(hào)： DS21Q41BT
廠商： DALLAS SEMICONDUCTOR
元件分類： Digital Transmission Controller
英文描述： DATACOM, FRAMER, PQFP128
封裝： TQFP-128
文件頁數(shù)： 24/61頁
文件大?。?/td> 714K
代理商： DS21Q41BT
DS21Q41B
30 of 61
5.0 ERROR COUNT REGISTERS
There are a set of three counters in the DS21Q41B that record bipolar violations, excessive 0s, errors in
the CRC6 code words, framing bit errors, and number of multiframes that the device is out of receive
synchronization.
Each of these three counters are automatically updated on 1-second boundaries as
determined by the one second timer in Status Register 2 (SR2.5).
Hence, these registers contain
performance data from the previous second. The user can use the interrupt from the 1-second timer to
determine when to read these registers. The user has a full second to read the counters before the data is
lost. All three counters will saturate at their respective maximum counts and they will not rollover (note:
only the Line Code Violation Count Register has the potential to overflow).
5.1 Line Code Violation Count Register (LCVCR)
Line Code Violation Count Register 1 High (LCVCR1) is the most significant word and LCVCR2 is the
least significant word of a 16-bit counter that records code violations (CVs). CVs are defined as Bipolar
Violations (BPVs) or excessive 0s. See Table 5-1 for details of exactly what the LCVCRs count. If the
B8ZS mode is set for the receive side via CCR2.2, then B8ZS code words are not counted. This counter is
always enabled; it is not disabled during receive loss of synchronization (RLOS=1) conditions.
LCVCR1: LINE CODE VIOLATION COUNT REGISTER 1 (Address=23 Hex)
LCVCR2: LINE CODE VIOLATION COUNT REGISTER 2 (Address=24 Hex)
(MSB)
(LSB)
LCV15
LCV14
LCV13
LCV12
LCV11
LCV10
LCV9
LCV8
LCVCR1
LCV7
LCV6
LCV5
LCV4
LCV3
LCV2
LCV1
LCV0
LCVCR2
SYMBOL
POSITION
NAME AND DESCRIPTION
CV16
LCVCR1.7
MSB of the 16-bit code violation count
CV0
LCVCR2.0
LSB of the 16-bit code violation count
LINE CODE VIOLATION COUNTING ARRANGEMENTS Table 5-1
COUNT EXCESSIVE
0S? (RCR1.7)
B8ZS ENABLED?
(CCR2.2)
WHAT IS COUNTED IN THE LCVCRs
no
BPVs
yes
no
BPVs + 16 consecutive 0s
no
yes
BPVs (B8ZS code words not counted)
yes
BPVs + 8 consecutive 0s
5.2 Path Code Violation Count Register (PCVCR)
When the receive side of the DS21Q41B 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, the DS21Q41B 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 5-2 for a detailed description of exactly what errors the PCVCR counts.
相關(guān)PDF資料
PDF描述
DS21Q42TN DATACOM, FRAMER, PQFP128
DS21Q42T DATACOM, FRAMER, PQFP128
DS21Q43AT DATACOM, FRAMER, PQFP128
DS21Q44T DATACOM, FRAMER, PQFP128
DS21Q44TN DATACOM, FRAMER, PQFP128
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS21Q41-BT 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:
DS21Q41BT+ 功能描述:網(wǎng)絡(luò)控制器與處理器 IC RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray
DS21Q41BT+T 功能描述:網(wǎng)絡(luò)控制器與處理器 IC RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray
DS21Q41BTN 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Quad T1 Framer
DS21Q41-BTN 功能描述:網(wǎng)絡(luò)控制器與處理器 IC RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray
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