SAA2013 datasheet(13/32 Pages) PHILIPS

13 / 32 page

May 1994

Philips Semiconductors

Preliminary speciﬁcation

Adaptive allocation and scaling for PASC

coding in DCC systems

SAA2013

Table 5

Interface modes.

MODE

ADDRESS

INTERFACE MODE

LENGTH (BITS)

DIRECTION

BIT 1

BIT 0

Decode

extended settings

microcontroller to SAA2003

−−

−

settings

microcontroller to SAA2003

status/peak

16 or 48

SAA2003 to microcontroller

Encode

extended settings

microcontroller to SAA2003

allocation/scale

× 16

SAA2013 to SAA2003

settings

microcontroller to SAA2003

status/peak

16 or 48

SAA2003 to microcontroller

PRIORITY

Each type of transfer has a priority. The priorities are:

1. Allocation/scale/settings (highest priority).

2. Status read.

3. Peak read.

4. Extended settings (lowest priority).

ALLOCATION AND SCALE FACTOR TRANSFER

The allocation and scale factor information sent from

SAA2013 to SAA2003 during encode has the highest

priority. The other types of transfer interleaved with the

allocation/scale information.

SETTINGS TRANSFER

This is a 16-bit transfer. The microcontroller sends settings

to SAA2003. SAA2013 only transfers these without taking

notice of the contents. In encode, the settings are held in

the transit registers, and sent next time that allocation is

being sent. In decode, settings are sent as soon as

possible subject to the RTRC flag from SAA2003.

Before sending settings the microcontroller should read

the status of SAA2013 to examine the Ready-To-Receive

bit Settings (RTRS). After the settings have been received

by SAA2013, RTRS will be made logic 0, until the settings

have been sent to SAA2003. Only after RTRS is logic 1

again may the microcontroller send new settings.

STATUS READ

Status and peak information may be read from SAA2003

by the microcontroller. The status bits are defined in

Table 6.

Table 6

Status bits.

BIT

NAME

FUNCTION

VALID IN

B15 to B12

bit rate index

bit rate indication

encode/decode

B11 and B10

sample frequency indication

44.1, 48, 32 kHz indication

encode/decode

RTRS (settings)

1 = ready; 0 = not ready

encode/decode

RTRE (external settings)

1 = ready; 0 = not ready

encode/decode

B7 and B6

MODE

sub-band signal mode

identiﬁcation

encode/decode

SYNC

synchronization indication

encode/decode

CLKOK

1 = OK; 0 = not OK

encode/decode

B3 and B2

Tr0 and Tr1

transparent bits

encode/decode

B1 and B0

EMPHASIS

emphasis indication

encode/decode

SAA2013 Datasheet(PDF) 13 Page - NXP Semiconductors

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