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NXR-700H
■
Start-up of each Control Block
• Main MPU Block
Component elements:
· Main MPU: IC703
· Flash Memory: IC702
· SD RAM: IC704 and IC707
· LAN IC: IC719
· RTC: IC701
Overview of Start-up Operation:
When MPU reset line logic switches as high, the MPU
starts reading the program from the flash memory and
expands the program to SDRAM. Linux OS begins opera-
tion on the SDRAM after main MPU transfers the program.
Main MPU works usage of Linux OS codes. The other
higher-level applications software to the Linux OS will also
be expanded in SDRAM. On starting up, main MPU verify
the status of the registers in LAN IC except SDRAM which
is purpose of backup data even if abnormal symptom de-
tects in either LAN IC or SDRAM, the start-up process is
not affected by this error; main MPU behaves operation as
if it works properly. To express another word, either Flash
memory or SDRAM has defective, a circuit behaves as if
main MPU happens malfunction. After executing all ini-
tialization routines, the Main MPU verifi es the operational
status of each MPU then transmits/ receives the operation
transfer command set to from the Modem control MPU
(IC325) and the RF control MPU (IC34) using 115.2kbps
UART communications.
• RF Control MPU Block
Component elements:
· RF control MPU: IC34
· Flash memory: IC17
· DSP: IC37
Overview of Start-up Operation:
When the RF control MPU (IC34) reset line logic switches
as high, this MPU reads the boot program from the internal
ROM of MPU and then initializes the peripheral devices.
After this boot process completes, the MPU starts work-
ing with the programs (application programs) stored in fl ash
memory (IC17) to process the preprogrammed tasks. Dur-
ing the process, the MPU transfers the program to the DSP
IC (IC37). It also verifi es the operating status of DSP at cer-
tain interval.
After a series of processes completes, the RF control
MPU verifi es the operational status and then transmits and
receives the operation transfer command set to/from Main
MPU (IC703) using 115200bps UART communications.
• Modem Control MPU Block
Component elements:
· Modem control MPU: IC325
· Flash memory: IC314
· RX DSP: IC323
· TS Vocoder DSP: IC324
106
TROUBLE SHOOTING /
故障排除
■各控制块的启动
• 主 MPU 块
组成部分 :
·主 MPU: IC703
·闪存 : IC702
·SD RAM: IC704 和 IC707
·LAN IC: IC719
·RTC: IC701
启动操作概述 ：
当 M P U 复位线路逻辑转换为高时，M P U 开始从闪存读取程
序并将程序扩展到 SDRAM。主 MPU 传送程序之后，Linux OS
开始在 SDRAM 上运行。
主 MPU 使用 Linux OS 代码工作。其它更高级的 Linux OS
应用软件也会在 S D R A M 中扩展。启动时，即使 L A N I C 或
SDRAM 内检测到异常现象，主 MPU 也会确认 LAN IC 中寄存器
的状态，用于备份数据的 S D R A M 除外，启动过程不受此错误
的影响， 主 MPU 将按照其正常工作的方式执行操作。换句话说，
闪存或 S D R A M 存在缺陷时，电路将按主 M P U 发生故障的方式
运行。执行所有初始化任务之后， 主 MPU 将确认各 MPU 的状态，
然后利用 115.2kbps UART 通信发送 / 接收发到 / 来自调制解
调器控制 MPU(IC325) 和 RF 控制 MPU(IC34) 的操作传送指令集。
• RF 控制 MPU 块
组成部分 :
·RF 控制 MPU: IC34
·闪存 : IC17
·DSP: IC37
启动操作概述 :
当 RF 控制 MPU(IC34) 复位线路逻辑转换为高时，此 MPU 将
从 M P U 的内部 R O M 读取引导程序，然后初始化外围设备。完
成该引导过程后，M P U 将以闪存 ( I C17) 内储存的程序 ( 应用
程序 ) 开始工作，对编程的任务进行处理。处理过程中，M P U
将程序传送到 DSP IC(IC37)。此外，它还会按一定的间隔确
认 DSP 的运行状态。
一系列过程完成后，R F 控制 M P U 将确认运行状态，然后利
用 115200bps UART 通信发送 / 接收发到 / 来自主 MPU(IC703)
的操作传送指令集。
• 调制解调器控制 MPU 块
组成部分 :
·调制解调器控制 MPU: IC325
·闪存 : IC314
·RX DSP: IC323
·TS 声码器 DSP: IC324
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