GS1503BCVE2 GENNUM [Gennum Corporation], GS1503BCVE2 Datasheet - Page 64

• Manufacturer Part Number: GS1503BCVE2
• Description: HD Embedded Audio CODEC Data Sheet
• Manufacturer: GENNUM [Gennum Corporation]

5.6.4 Audio Data Packet Detection
The audio data packet detect registers will be set HIGH when a corresponding audio
group DID has been detected in the Chroma channel of the input video stream. Host
Interface register 013h, bits 7-4, report the individual audio groups detected.
Table 5-16: Register Settings
5.6.5 ECC Error Detection & Correction
The GS1503B performs BCH(31,25) forward error detection and correction as described
in SMPTE 299M. The error correction for audio data packets with audio group DID set in
DATAIDA[1:0] is activated when ECCA_ON bit 0 of Host Interface register 013h is set
HIGH. Similarly, error correction for audio data packets with audio group DID set in
DATAIDB[1:0] is activated when ECCB_ON bit 1 of Host Interface register 013h is set
HIGH
When a one-bit error is detected in a bit array of the ECC protected region of the audio
data packet with audio group DID set in DATAIDA[1:0], ECCA_ERR bit 1 in Host
Interface register 015h is set HIGH. When a one-bit error is detected in the ECC
protected region of the audio data packet with audio group DID set in DATAIDB[1:0], the
ECCB_ERR bit 5 in Host Interface register 015h is set HIGH. In both cases, the ERROR
external pin will also be set HIGH.
A bit array is defined as all 24 bits of bit 0. The next bit array is all 24 bits of bit 1, and so
on through to bit 7. Up to 8 bits in error can be corrected, providing each bit error is in a
different bit array. When there are two bits in error in the same 24-bit array, the errors
will be detected, but not corrected. When there are more than two bits in error in a single
bit array, the errors will not be detected or corrected.
The number of audio data packets corrected in one video frame will be reported in the
corresponding Host Interface registers CORRECTA[11:0] and CORRECTB[11:0]. The
GS1503B will also report the number of audio data packets which could not be corrected
in one video frame in the corresponding Host Interface registers NO_CORRECTA[11:0] and
NO_CORRECTB[11:0].
GS1503B HD Embedded Audio CODEC
Data Sheet
37953 - 1
Name
ADPG4_DET
ADPG3_DET
ADPG2_DET
ADPG1_DET
December 2009
Description
Audio group 4 data packet detection
Audio group 3 data packet detection
Audio group 2 data packet detection
Audio group 1 data packet detection
(1:Detection)
(1:Detection)
(1:Detection)
(1:Detection)
Address
013
013
013
013
Bit
7
6
5
4
Setting
–
–
–
–
Default
0
0
0
0
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