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TDMA T2290/T2297:
Description
The following list is a description of the DSP(U1900):
•
ROM Mask Device(48K)
•
Patch RAM space(16K)
•
Fixed point MAC(multi ply accumulator)
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8-bit parallel interface
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8-bit control I/O interface
•
Dual serial I/O ports
•
Two external int errupts
•
Flexible power management includi ng Sleep mode, Sleep with slow internal
clock, and stop
•
Three modes of operation
1. Actively running
2. Light sl eep - Clocks running , but lower power consumption
3. Deep sleep - All cl ocks off, extremely l ow power consumption
•
Digital Traffic Channel
1. Acquiring and maintaining synchronization with the Digital Channel
2. AFC, AGC, AOC control loops
3. Vocoders (ACELP)
4. Channel equalization
5. Channel decoding
6. Channel encoding
7. Audio functions
8. MAHO measurements
DSP (U1900)
BLOCK DIAGRAM NOT NECESSARY
REFER TO PAGE B33
•
Digital Control channel
1. Essentially DTC minus audi o 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 d eep sleep
2. Manchester Encoder
3. Transmitter control
•
Analog voice channel
1. Audio processing
2. SAT detection/Transponding
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