Motorola P8190 Service Manual download pdf (Page 95)

Motorola Confidential Proprietary

Theory of OperationService Manual

83

version, to be compatible with the existing

word-wide communications with U1000(Call

processor).

DSP Timer - It provides a timer function.

This is a device, accessible to the DSP, which

implement a continuously clocked timer,

with rollover, a feature needed for modem

functionality but difficult to implement with

the ATT device. The ATT timer can be set

up to either stop on count=0, or to repeat the

last count interval. We need a counter that

can be set up to interrupt at a particular point

in time, and then keeps counting, so that

real-time is preserved, and can be set for a

future time interval. This timer has a clock

that is coherent with the symbol rate.

General Purpose I/O - It provides a 4-bit

general purpose I/O port, with programming

data direction function, as an extension to

the call processor bit I/O set.

RF SPI interface - Improved interface be-

tween the Call processor, DSP, and ZIFSYN

for scanning requirements needed because

of the PCS band.

Transmitter control logic - Transmitter

keying and frequency band selection.

 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 synchro-

nization 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

 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

DSP (U1900)

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

DSP(U1900)

1 2 ... 90 91 92 93 94 95 96 97 98 99 100 ... 148 149

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