通信设计应用
表1. 寄存器映象差异
Register Name.Bit | Address | Bit Name | DS2155 | DS21458 | Comments |
CCR1.3 | 70h | DICAI | X | -- | Disable Idle Code Auto Increment - Selects/deselects the auto-increment feature for the transmit and receive idle code array address register, this function is not available in the DS21458 |
CCR1.7 | 70h | MCLKS | X | -- | MCLK Select, allows the user to select either TSYSCLK or MCLK as the master clock, this function is not available in the DS21458 |
CCR3.6 | 72h | INTDIS | X | -- | Interrupt Disable, allows the user to disable all interrupts regardless of the Interrupt Mask Register settings, this function is not available in the DS21458. |
CCR3.7 | 72h | TMSS | X | -- | Transmit Multi-frame Sync Source, allows the users to select the framer or TSYNC pin as the source of the multi-frame sync, this feature is not available on the DS21458. |
LBCR.7 | 4Ah | LTS | -- | X | LIUC/TPD Pin Function Select, this pin selects the function of the LIUC/TPD pin and should always be set to a 1 in the DS21458. This bit does not exist in the DS2155 memory map. |
PSA1 | F1h | -- | -- | X | Pulse Shape Adjustment Register 1 - Allows the user to adjust the transmit pulse waveform, this register is not available on the DS2155. |
PSA2 | F2h | -- | -- | X | Pulse Shape Adjustment Register 2 - Allows the user to adjust the transmit pulse waveform, this register is not available on the DS2155. |
IDR | 0Fh | -- | X | X | Device Identification Register - This read only register displays the Device ID and Chip Revision of the given device and the contents will depend on which part or revision is used. |
DS2155有一个MCLK引脚,而DS21458有两个MCLK引脚,分别称为MCLK1和MCLK2。这两个引脚可以由DS21458上的一个公共源驱动。
DS2155有一个XTALD引脚,允许选择使用一个石英晶体连接在MCLK和XTALD引脚上。DS21458不支持这项功能,因而没有XTALD引脚。
8xCLK引脚也是DS21458所没有的。该引脚是DS2155的8倍频时钟输出,在DS21458上被取消了。
DS21458多了两个地址引脚, A8和A9,在DS2155上没有。这些地址引脚用于选择四个端口中的一个。
DS2155有四个普通用户输出引脚,不再出现在DS21458上。这些引脚是UOP0, UOP1, UOP2和UOP3。
LIUC引脚在DS2155上用于分离线路接口单元(LIU)和成帧器,在DS21458上被称为发送掉电(TPD)引脚。在DS21458上用户能够有限地访问成帧器和LIU之间的时钟和数据信号,不再需要LIUC引脚。在DS2155上只能通过LIC1寄存器中的TPD位使用TPD功能。由于能够有限地访问LIU和成帧器之间的信号,以下引脚在DS21458上不再出现:TPOSI, TNEGI, TCLKI, RPOSI, RNEGI和RCLKI。
全部0条评论
快来发表一下你的评论吧 !