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参数资料
型号： DS21Q58
英文描述： E1 Quad Transceiver
中文描述： E1四收发器
文件页数： 29/74页
文件大小： 647K
代理商： DS21Q58
DS21Q58 E1 Quad Transceiver
29 of 74
Register Name:
Register Description:
Register Address:
Bit #
Name
NAME
CSC5
CSC4
CSC3
CSC2
SSR
Synchronizer Status Register
09 Hex
7
6
5
4
3
2
1
0
CSC5
CSC4
CSC3
CSC2
CSC0
FASSA
CASSA
CRC4SA
BIT
7
6
5
4
FUNCTION
CRC4 Sync Counter Bit 5.
MSB of the 6-bit counter.
CRC4 Sync Counter Bit 4
CRC4 Sync Counter Bit 3
CRC4 Sync Counter Bit 2
CRC4 Sync Counter Bit 0.
LSB of the 6-bit counter. Counter bit 1 is not
accessible.
FAS Sync Active.
Set while the synchronizer is searching for alignment at the
FAS level.
CAS MF Sync Active.
Set while the synchronizer is searching for the CAS MF
alignment word.
CRC4 MF Sync Active.
Set while the synchronizer is searching for the CRC4
MF alignment word.
CSC0
3
FASSA
2
CASSA
1
CRC4SA
0
9.2 CRC4 Sync Counter
The CRC4 sync counter increments each time the 8ms CRC4 multiframe search times out. The counter is cleared
when the framer has successfully obtained synchronization at the CRC4 level. The counter can also be cleared by
disabling the CRC4 mode (CCR1.0 = 0). This counter is useful for determining the amount of time the framer has
been searching for synchronization at the CRC4 level. ITU G.706 suggests that if synchronization at the CRC4
level cannot be obtained within 400ms, the search should be abandoned and proper action taken. The CRC4 sync
counter rolls over.
Table 9-1. Alarm Criteria
ALARM
RSA1
SET CRITERIA
CLEAR CRITERIA
ITU SPEC
(Receive Signaling
All Ones)
RSA0
(Receive Signaling
All Zeros)
RDMA
(Receive Distant
Multiframe Alarm)
RUA1
(Receive Unframed
All Ones)
RRA
(Receive Remote
Alarm)
RCL
(Receive Carrier
Loss)
Over 16 consecutive frames (one full
MF) time slot 16 contains less than three
zeros
Over 16 consecutive frames (one full
MF) time slot 16 contains three or more
zeros
Over 16 consecutive frames (one full
MF) time slot 16 contains at least a
single one
G.732
4.2
Over 16 consecutive frames (one full
MF) time slot 16 contains all zeros
G.732
5.2
Bit 6 in time slot 16 of frame 0 set to one
for two consecutive MF
Bit 6 in time slot 16 of frame 0 set to
zero for two consecutive MF
O.162
2.1.5
Fewer than three zeros in two frames
(512 bits)
More than two zeros in two frames (512
bits)
O.162
1.6.1.2
Bit 3 of nonalign frame set to one for
three consecutive occasions
Bit 3 of nonalign frame set to zero for
three consecutive occasions
O.162
2.1.4
255 (or 2048) consecutive zeros
received
In 255-bit times at least 32 ones are
received
G.775/
G.962
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相关代理商/技术参数
参数描述
DS21Q58L 功能描述:网络控制器与处理器 IC Quad E1 Transceiver RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray
DS21Q58L+ 功能描述:网络控制器与处理器 IC Quad E1 Transceiver RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray
DS21Q58LN 功能描述:网络控制器与处理器 IC RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray
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