参数资料
型号: DS21Q44T+
厂商: Maxim Integrated Products
文件页数: 75/105页
文件大小: 0K
描述: IC FRAMER ENHANCED E1 4X 128TQFP
标准包装: 72
控制器类型: E1 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
DS21Q44
71 of 105
For all bus configurations, one framer will be configured as the master device and the remaining framers
on the shared bus will be configured as slave devices. Refer to the IBO register description below for
more detail. In the 4.096 MHz bus configuration there is one master and one slave per bus. Figure 18-1
shows the DS21Q44 configured to support two 4.096 MHz buses. Bus 1 consists of framers 0 and 1. Bus
2 consists of framers 2 and 3. Framers 0 and 2 are programmed as master devices. Framers 1 and 3 are
programmed as slave devices. In the 8.192 MHz bus configuration there is one master and three slaves.
Figure 18-2 shows the DS21Q44 configured to support a 8.192 MHz bus. Framer 0 is programmed as the
master device. Framers 1, 2 and 3 are programmed as slave devices. Consult timing diagrams in section
18 for additional information.
When using the frame interleave mode, all framers that share an interleaved bus must have receive signals
(RPOS & RNEG) that are synchronous with each other. The received signals must originate from the
same clock reference. This restriction does not apply in the byte interleave mode.
IBO: INTERLEAVE BUS OPERATION REGISTER (Address = B5 Hex)
(MSB)
(LSB)
––––
IBOEN
INTSEL
MSEL0
MSEL1
SYMBOL
POSITION
NAME AND DESCRIPTION
–IBO.7
Not Assigned. Should be set to 0.
–IBO.6
Not Assigned. Should be set to 0.
–IBO.5
Not Assigned. Should be set to 0.
–IBO.4
Not Assigned. Should be set to 0.
IBOEN
IBO.3
Interleave Bus Operation Enable
0 = Interleave Bus Operation disabled.
1 = Interleave Bus Operation enabled.
INTSEL
IBO.2
Interleave Type Select
0 = Byte interleave.
1 = Frame interleave.
MSEL0
IBO.1
Master Device Bus Select Bit 0 See table 16-1.
MSEL1
IBO.0
Master Device Bus Select Bit 1 See table 16-1.
Table 16-1. MASTER DEVICE BUS SELECT
MSEL1
MSEL0
FUNCTION
0
Slave device
0
1
Master device with 1 slave device (4.096 MHz bus rate)
1
0
Master device with 3 slave devices (8.192 MHz bus rate)
11
Reserved
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