SAA7346H データシートの表示（PDF） - Philips Electronics

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SAA7346H

Shock absorbing RAM addresser

Philips Electronics 

Philips Semiconductors

Shock absorbing RAM addresser

Preliminary specification

SAA7346

Table 2 Command register flag functions.

COMMAND

Flush

Bypass

Echo

jmp_bz

otd_p

e_rot_sd

µCsd

PFB

DESCRIPTION

Flush, when set, will empty the FIFO, reset the read and write pointer addresses. Then writing will

resume to the FIFO. Flag reset automatically.

Bypass, when set, will power down the SAA7346. The I2S interface passes input to output directly.

The parallel interface port controls RAS, CAS, WE and OE which are pulled HIGH. KILL passes

directly to KILLOUT. When exiting by-pass mode the FIFO is automatically flushed.

Echo, when set, will cause the FIFO contents to be continuously played until the correct position is

found again.

Jump busy, when set, indicates a jump is being preformed. The OTD shock detector input will be

disabled. After the jump has finished the flag should be reset by a write.

OTD polarity enable. Enables the polarity of the OTD input to be switched from active HIGH set,

active LOW not set.

Enable rotational shock detection, when set, will detect shocks whenever the decoder rolls out of its

internal FIFO.

Microcontroller shock detected is set when the microcontroller has detected a shock.

Position Found Back, when set, indicates that the microcontroller has found the absolute time frame

after a shock or hold cycle. The audio data will sew together and the flag reset automatically.

handbook, full pagewidth

SICL

SILD

SIDA

B7 B6 B5 B4 B3 B2 B1 B0

MGB433

Fig.6 Microcontroller WRITE timing.

Writing operation sequence:

• SILD is held HIGH by the microcontroller.

• Microcontroller data is clocked into the internal

command register on the LOW-to-HIGH clock transition

of SICL.

• SILD is pulled LOW by the microcontroller to latch-in

data to the command register.

• SICL and SILD are pulled HIGH by the microcontroller

to indicate that communications have finished.

READING STATUS OF SAA7346

The SAA7346 has a status register shown in Table 1. This

can be read via the microcontroller interface shown in

Fig.7. The internal status signals are made available on

the SIDA pin and are shown in Table 3.

July 1994

8

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