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TDMA StarTAC
Description
The following list is a description of the DSP(U1900):
•
ROM Mask Device(48K)
•
Patch RAM space(16K)
•
Fixed point MAC(multiply accumulator)
•
8-bit parallel interface
•
8-bit control I/O interface
•
Dual serial I/O ports
•
Two external interrupts
•
Flexible power management including Sleep mode, Sleep with slow internal
clock, and stop
•
Three modes of operation
1. Actively running
2. Light sleep - Clocks running, but lower power consumption
3. Deep sleep - All clocks off, extremely low power consumption
•
Digital Traffic Channel
1. Acquiring and maintaining synchronization with the Digital Channel
2. AFC, AGC, AOC control loops
3. Vocoders (ACELP and VCELP)
4. Channel equalization
5. Channel decoding
6. Channel encoding
7. Audio functions
8. MAHO measurements
TM
P8190:
BLOCK DIAGRAM NOT NECESSARY
REFER TO PAGE B37
DSP(U1900)
•
Digital Control channel
1. Essentially DTC minus audio and vocoders
2. ROCM instead of MAHO
3. Modem goes into deep sleep for long periods
•
Analog Control Channel
1. No RX functions - modem in deep sleep
2. Manchester Encoder
3. Transmitter control
•
Analog voice channel
1. Audio processing
2. SAT detection/Transponding
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