参数资料
型号: DS21Q42T+
厂商: Maxim Integrated Products
文件页数: 70/116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
57 of 116
12.
CLOCK BLOCKING REGISTERS
The Receive Channel Blocking Registers (RCBR1/RCBR2/RCBR3) and the Transmit Channel Blocking
Registers (TCBR1/TCBR2/TCBR3) control the RCHBLK and TCHBLK pins respectively.
The
RCHBLK and TCHCLK pins are user programmable outputs that can be forced either high or low during
individual channels. These outputs can be used to block clocks to a USART or LAPD controller in
Fractional T1 or ISDN–PRI applications. When the appropriate bits are set to a one, the RCHBLK and
TCHCLK pins will be held high during the entire corresponding channel time. See the timing in Section
20 for an example.
RCBR1/RCBR2/RCBR3: RECEIVE CHANNEL BLOCKING REGISTERS
(Address=6C to 6E Hex)
(MSB)
(LSB)
CH8
CH7
CH6
CH5
CH4
CH3
CH2
CH1
RCBR1 (6C)
CH16
CH15
CH14
CH13
CH12
CH11
CH10
CH9
RCBR2 (6D)
CH24
CH23
CH22
CH21
CH20
CH19
CH18
CH17
RCBR3 (6E)
SYMBOLS
POSITIONS
NAME AND DESCRIPTION
CH1 – 24
RCBR1.0 - 3.7
Receive Channel Blocking Control Bits.
0 = force the RCHBLK pin to remain low during this channel
time
1 = force the RCHBLK pin high during this channel time
TCBR1/TCBR2/TCBR3: TRANSMIT CHANNEL BLOCKING REGISTERS
(Address=32 to 34 Hex)
(MSB)
(LSB)
CH8
CH7
CH6
CH5
CH4
CH3
CH2
CH1
TCBR1 (32)
CH16
CH15
CH14
CH13
CH12
CH11
CH10
CH9
TCBR2 (33)
CH24
CH23
CH22
CH21
CH20
CH19
CH18
CH17
TCBR3 (34)
SYMBOLS
POSITIONS
NAME AND DESCRIPTION
CH1 – 24
TCBR1.0 - 3.7
Transmit Channel Blocking Control Bits.
0 = force the TCHBLK pin to remain low during this channel
time
1 = force the TCHBLK pin high during this channel time
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