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¡ Semiconductor

MSM7581

THR Processing Timing

Timing Block Diagrams, when CODER and DECODER output data, are shown in the following

figures.

The parallel to serial conversion of the output unit employs a load format and the load point is

at the rising edge of a synchronous signal.

Therefore, input THR signal with respect to SYXA for CODER with timing of satisfying ts and

th conditions shown in the figure.

For DECODER, THR signal should be input even of through-data is input.

The input timing should satisfy the conditions shown in the following figures.

CODER

8

Through-data

4b

ADPCM

CODER

8b

S

E

L

SYNCA

SOA

BCLKA

Serial

Parallel

SYXP

SIP

BCKP

THR

Latch timing=A

MSB

LSB

th

ts

MSB

ts=100ns or more

th=100ns or more

PCM side SYNC (SYXP)

PCM Input (SIP)

Internal Latch timing (A)

Internal Input Data

ADPCM side SYNC (SYXA)

Through-data Output (SOA)

BCKA

THR

Through-data

Parallel

Serial

Latch

Note: That data-ship may occur when the rising edge (data load point) of SYXA and input of

the internal latch timing overlap each other.