Tait TB9100 - Page 26

26 Digital Circuitry TB9100 Reciter Service Manual
© Tait Electronics Limited January 2006
3.3.2 Responsibilities
The RISC communicates with the DSP’s shared memory via a host port
interface. It loads the DSP code and monitors and controls the following
DSP operations:
■ receive path
■ transmit path
■ crosspoint switches
■ power supplies
■ PA Key output.
Figure 3.2 Reciter RISC Functional Block Diagram
Reciter
Status
External
Reference
Detect/
Select
RISC
40MHz
Clock
Synthesizers
Flash
RAM
DSP
System
Control
Bus
ASIF
PCB
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 BSS 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
IC
2
UART
Fan Good
SPI
Select
Rx Gate
Tx Relay
Tx Key
Hex Switch
Test
Digital PCB
RF PCB
- ARM 7 Processor
- Drivers
- SPI
- UART
- Timers
- Watchdog
- Discrete I/O
- Interrupts