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参数资料
| 型号： | DS21FT40N |
| 厂商： | DALLAS SEMICONDUCTOR |
| 元件分类： | Digital Transmission Controller |
| 英文描述： | DATACOM, FRAMER, PBGA300 |
| 封装： | BGA-300 |
| 文件页数： | 31/87页 |
| 文件大小： | 386K |
| 代理商： | DS21FT40N |
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DS21FT40
37 of 87
ALARM CRITERIA Table 6-1
ALARM
SET CRITERIA
CLEAR CRITERIA
ITU
SPEC.
RSA1 (receive
signaling all ones)
over 16 consecutive frames
(one full MF) timeslot 16
contains less than three zeros
over 16 consecutive frames
(one full MF) timeslot 16
contains three or more zeros
G.732
4.2
RSA0 (receive
signaling all zeros)
over 16 consecutive frames
(one full MF) timeslot 16
contains all zeros
over 16 consecutive frames
(one full MF) timeslot 16
contains at least a single one
G.732
5.2
RDMA (receive
distant multiframe
alarm)
bit 6 in timeslot 16 of frame 0
set to one for two consecutive
MF
bit 6 in timeslot 16 of frame 0
set to zero for two
consecutive MF
O.162
2.1.5
RUA1 (receive
unframed all ones)
less than three zeros in two
frames (512 bits)
more than two zeros in two
frames (512 bits)
O.162
1.6.1.2
RRA (receive remote
alarm)
bit 3 of non–align frame set
to one for three consecutive
occasions
bit 3 of non–align frame set
to zero for three consecutive
occasions
O.162
2.1.4
RCL (receive carrier
loss)
255 (or 2048) consecutive
zeros received
in 255 bit times, at least 32
ones are received
G.775 / G.962
SR2: STATUS REGISTER 2 (Address=07 Hex)
(MSB)
(LSB)
RMF
RAF
TMF
SEC
TAF
LOTC
RCMF
TSLIP
SYMBOLS
POSITION
NAME AND DESCRIPTION
RMF
SR2.7
Receive CAS Multiframe. Set every 2 ms (regardless if CAS
signaling is enabled or not) on receive multiframe boundaries.
Used to alert the host that signaling data is available.
RAF
SR2.6
Receive Align Frame. Set every 250
s at the beginning of
align frames. Used to alert the host that Si and Sa bits are
available in the RAF and RNAF registers.
TMF
SR2.5
Transmit Multiframe. Set every 2 ms (regardless if CRC4 is
enabled) on transmit multiframe boundaries. Used to alert the
host that signaling data needs to be updated.
SEC
SR2.4
One Second Timer. Set on increments of one second based on
RCLK. If CCR2.7=1, then this bit will be set every 62.5 ms
instead of once a second.
TAF
SR2.3
Transmit Align Frame. Set every 250
s at the beginning of
align frames. Used to alert the host that the TAF and TNAF
registers need to be updated.
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| DS21FT44+ | 功能描述:网络控制器与处理器 IC 4X3 E1 Framer E1 Framer E1 Framer 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 |
| DS21FT44N | 功能描述:网络控制器与处理器 IC 4x4 16/4x3 12 Chnl E1/E1 Framer 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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