Motorola M3097 Service Manual download pdf (Page 121)

TDMA M3090/M3097: DSP (U1900)

B38

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

BLOCK DIAGRAM NOT NECESSARY

REFER TO PAGE B39

• 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 detectio n/Transponding

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Motorola M3097 Service Manual Page 121