参数资料
型号: XRT83SL38IB
厂商: Exar Corporation
文件页数: 68/88页
文件大小: 0K
描述: IC LIU SH T1/E1/J1 OCTAL 225BGA
标准包装: 84
类型: 线路接口装置(LIU)
驱动器/接收器数: 8/8
规程: T1,E1,J1
电源电压: 3.135 V ~ 3.465 V
安装类型: 表面贴装
封装/外壳: 225-BGA
供应商设备封装: 225-BGA(19x19)
包装: 托盘
XRT83SL38
68
OCTAL T1/E1/J1 SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
REV. 1.0.2
CLOCK SELECT REGISTER
The input clock source is used to generate all the necessary clock references internally to the LIU. The
microprocessor timing is derived from a PLL output which is chosen by programming the Clock Select Bits and
the Master Clock Rate in register 0x81h. Therefore, if the clock selection bits or the MCLRATE bit are being
programmed, the frequency of the PLL output will be adjusted accordingly.
During this adjustment, it is
important to "Not" write to any other bit location within the same register while selecting the input/output clock
frequency. For best results, register 0x81h can be broken down into two sub-registers with the MSB being bits
D[7:3] and the LSB being bits D[2:0] as shown in Figure 22. Note: Bit D[7] is a reserved bit.
FIGURE 22. REGISTER 0X81H SUB REGISTERS
Programming Examples:
Example 1: Changing bits D[7:3]
If bits D[7:3] are the only values within the register that will change in a WRITE process, the microprocessor
only needs to initiate ONE write operation.
Example 2: Changing bits D[2:0]
If bits D[2:0] are the only values within the register that will change in a WRITE process, the microprocessor
only needs to initiate ONE write operation.
Example 3: Changing bits within the MSB and LSB
In this scenario, one must initiate TWO write operations such that the MSB and LSB do not change within ONE
write cycle. It is recommended that the MSB and LSB be treated as two independent sub-registers. One can
either change the clock selection (MSB) and then change bits D[2:0] (LSB) on the SECOND write, or vice-
versa. No order or sequence is necessary.
D0
D1
D2
D3
D4
D5
D6
D7
MSB
LSB
Clock Selection Bits
ExLOS, ICT
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