Tait TB8100, Service Manual

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TB8100 Service Manual Reciter Circuit Description 33
© Tait Electronics Limited September 2006
■
debug LEDs
■
fan good input
■
flash programming voltage control.
The RISC has the following serial interfaces:
■
asynchronous serial port for communication with the Service Kit,
Calibration Kit, Alarm Center, and Ethernet interface
■
serial peripheral interface (SPI) for programming the synthesizers
■
SPI for communication with the system interface board
■
I
2
C for communication with the control panel and other modules in the
subrack.
Figure 2.3 Reciter RISC functional block diagram
Reciter
Status
External
Reference
Detect/
Select
RISC
40MHz
Clock
Synthesizers
Flash
RAM
DSP
System
Control
Bus
System
Interface
Board
Interrupt
Interrupt
Main Loop
Debug LEDs
DIP Switch
SPI SPI
Chip Selects Chip Selects
Lock Detects
Lock Detects
Detect
10MHz or
12.8MHz External
System I/O
System Control Bus to
Base Station Modules
& Control Panel
10MHz or
12.8MHz
12.8MHz
Internal TCXO
Rx L.O.
Ex L.O.
12.8MHz
40MHz
Select
Address, Data, Control
Flash Programming Voltages
Alarm LEDs
I C
2
UART
Fan Good
SPI
Select
Rx Gate
Tx Relay
Tx Key
Hex Switch
Test
Digital Board
RF Board
- ARM 7 Processor
- Drivers
- SPI
- UART
- Timers
- Watchdog
- Discrete I/O
- Interrupts