LC89057W-VF4A-E SANYO [Sanyo Semicon Device], LC89057W-VF4A-E Datasheet - Page 31

• Manufacturer Part Number: LC89057W-VF4A-E
• Description: Digital Audio Interface Transceiver
• Manufacturer: SANYO [Sanyo Semicon Device]

10.7 IEC61937, DTS-CD/LD Detection Flag Output
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A function to output IEC61937 and DTS-CD/LD detection flags for Non-PCM data is provided.
When the UNPCM of non-PCM signal output setting is selected through the
signal is output from
information can see details of Non-PCM signal.
When bit 1 of channel status is non-PCM data ("1"), the IEC61937 sync signal is detected and output. If bit 1 is PCM
data, the IEC61937 sync signal is not output.
DTS-CD/LD sync signal detection is done based on the sync pattern and the base frequency. DTS-ES data detection is
output when the DTS5.1 channel sync signal is detected and the DTS-ES sync pattern is verified.
The IEC61937 and DTS-CD/LD detection flags are cleared when fs have changed or a PLL lock error or data error
has occurred.
Since the DTS sync signal is provided within the audio data, digital data with the same code as the DTS sync signal
may exist in rare cases for regular CD/LD records that are not recorded in the DTS format. Protection using the sync
pattern or base frequency is provided so that such data is not misinterpreted as DTS-CD/LD detection flags. The
detection sequence is shown below.
IEC61937 data hold
IEC61937 flag OK
Bit 1detection
Frame counter
PaPb detection
INT lowered
PaPb detection
during 4096
YES
YES
YES
INT detecting an IEC61937 or DTS-CD/LD sync signal. Reading output register from this
Input data
YES
______
Bit 1=1
during 4096
detection
frames
PaPb
start
frames
Figure 10.16 IEC61937 and DTS-CD/LD Data Detection Sequence
NO
NO
NO
NO
* Depending on the frame count,
· the subsequent detection count
· is expanded up to ×2.
· Periodic fluctuation is supported.
1st count
1024
2048
4096
512
Frame counter
IEC61937 flag
INT lowered
not valid
LC89057W-VF4A-E
reset
⇒
⇒
⇒
⇒
512 or 1024
1024 or 2048
2048 or 4096
4096
2nd count
*
*
512,1024,2048,4096
512,1024,2048,4096
DTS-CD/LD flag OK
DTS-CD/LD SYNC
x2 count detection
Frame count hold
SYNC detection
SYNC detection
Frame counter
Frame count
Frame count
INT lowered
DTS-CD/LD
YES
YES
expansion
YES
detection
data hold
INT output contents setting, an interrupt
______
start
NO
NO
NO
DTS-CD/LD flag
Frame counter
INT lowered
not valid
reset
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