SAA2521GP Philips, SAA2521GP Datasheet - Page 16

• Manufacturer Part Number: SAA2521GP
• Description: Masking threshold processor for MPEG layer 1 audio compression applications
• Manufacturer: Philips

Philips Semiconductors
SETTINGS (LTCNT1(C) = logic 1, LTCNT0(C) = logic 0)
Without using the information, the SAA2521 transfers
microcontroller settings to the SAA2520.
Prior to sending settings, the microcontroller would utilize
the SAA2521 status readings to ensure its readiness to
accept and convey the data.
Following reception of the settings the SAA2521 will cause
the ready-to-receive bit to be logic 0 until the settings have
been sent to the SAA2520. The microcontroller can only
send this data when this bit is logic 1.
Fig.13 shows the order of the bits on the interface.
Table 9 Microprocessor settings applied to the SAA2520 via the SAA2521.
August 1993
S15
S11
S9
S8
S7
S6
S5
S4
S3
S1
MSB
Masking threshold processor for MPEG
layer 1 audio compression applications
LTENA/C
LTCLK(C)
LTDATA(C)
LTCNT0(C)/1(C)
S14
S10
S2
S0
bit :
BITS
S13
S :
Fig.13 The order of bits on the interface.
8
9
S12
1
0
LSB
1
1
1
2
1
3
bitrate index
sample frequency
DECODE
ext 256f
2-ch mono
MUTE
not used
CH I
Tr0 - Tr1
EMPHASIS
16
1
4
1
5
NAME
s
0
1
2
3
bitrate indication
44.1, 48 or 32 kHz indic.
1 - decode; 0 - encode
1 - ext; 0 - int
1 - 2 ch mono; 0 - stereo
1 - mute; 0 - no mute
1 - CH I; 0 - CH II
transparent bits
emphasis indication
4
5
6
FUNCTION
7
Preliminary specification
SAA2521
MBC132
encode
encode
enc/dec
enc/dec
encode
enc/dec
enc/dec
decode
encode
encode
VALID IN