Preliminary Information

MT9160

7-83

The data streams operate at 2048 kb/s and are Time

Division Multiplexed into 32 identical channels of 64

kb/s bandwidth. A frame pulse (a 244 nSec low going

pulse) is used to parse the continuous serial data

streams into the 32 channel TDM frames. Each

frame has a 125 µSecond period translating into an 8

kHz frame rate. A valid frame begins when F0i is

logic low coincident with a falling edge of C4i. Refer

to Figure 11 for detailed ST-BUS timing. C4i has a

frequency (4096 kHz) which is twice the data rate.

This clock is used to sample the data at the 3/4

bit-cell position on DSTi and to make data available

on DSTo at the start of the bit-cell. C4i is also used to

clock the MT9160 internal functions (i.e., Filter/

Figure 5 - Serial Port Relative Timing for Intel Mode 0

Figure 6 - Serial Port Relative Timing for Motorola Mode 00/National Microwire

XX

R/W

Œ

Delays due to internal processor timing which are transparent.

y

The MT9160:-latches received data on the rising edge of SCLK.

Ž

The falling edge of CS indicates that a COMMAND/ADDRESS byte will be transmitted from the microprocessor. The



A new COMMAND/ADDRESS byte may be loaded only by CS cycling high then low again.



The COMMAND/ADDRESS byte contains:

Œ

Ž





Œ

y

Ž



COMMAND/ADDRESS

DATA INPUT/OUTPUT

COMMAND/ADDRESS:

DATA 1

RECEIVE

DATA 1

TRANSMIT

SCLK

CS

-outputs transmit data on the falling edge of SCLK.

subsequent byte is always data until terminated via CS returning high.

1 bit - Read/Write

3 bits - Addressing Data

4 bits - Unused

XX

Œ

Ž



Œ

y

Ž



COMMAND/ADDRESS

DATA INPUT/OUTPUT

COMMAND/ADDRESS:

DATA 2

RECEIVE

DATA 1

TRANSMIT

SCLK

CS

R/W

X

Œ

Delays due to internal processor timing which are transparent .

Ž

The falling edge of CS indicates that a COMMAND/ADDRESS byte will be transmitted from the microprocessor. The



A new COMMAND/ADDRESS byte may be loaded only by CS cycling high then low again.



The COMMAND/ADDRESS byte contains:

subsequent byte is always data until terminated via CS returning high.

1 bit - Read/Write

3 bits - Addressing Data

4 bits - Unused



y

The MT9160:-latches received data on the rising edge of SCLK.

-outputs transmit data on the falling edge of SCLK.

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