LC8905V Datasheet, PDF (13/16 Pages) Sanyo Semicon Device – Digital Audio Interface Receiver

LC8905V
3. The following output settings can be controlled:
• Channel status (C bit) output
• Subcode Q data output
• Status ID and shortening ID detection for DAT that use subcodes
C bit output
• This function presumes that this IC will be used in consumer mode and thus only handles the first 32 bits.
• The flag is fixed at the high level (although there is no flag in the type 1 microprocessor interface timing), and the
data format is LSB first.
• Error and update checking is not applied to the data.
• The internal shift register is reset if a PLL lock error occurs.
• An interval of at least 6 msec must be provided between consecutive data readout operations.
Subcode Q output
• Subcode Q can be read out after the fall of the DQSY/LD signal. Also note that the data is updated every time this
signal falls. However, this signal will not be output (fall) unless 96 bits of subcode Q data (include the CRC check
bits) is input.
• The flag outputs a high when the CRC check passes, and low if the CRC check fails.
• The bit order is LSB first within each byte of the 80 bits of subcode Q data.
ID detection
• The start ID and shortening ID are only detected when the DAT category code (1100000L) is received.
• These IDs are detected as follows:
— A low pulse is output from DQSY/LD if a start ID (R₀) or a shortening ID (L₁) is detected following a sync
signal (L₀).
— After this signal, data can be read out from SRDT/DO by inputting the same address value as that used for
subcode Q data to SWDT/DI.
Figure 4 User Data for DAT that Use Subcodes
• The table below shows the relationship between the sync signal (L₀), the start ID (R₀), the shortening ID (L₁), and
the data output.
(L₀): SYNC
(R₀): Start ID
(L₁): Shortening ID
Flags + 80 data bits
Detected ID
H
H
L
all H
Start ID
H
L
H
all L
Shortening ID
• Output pins
The output scheme used for SRDT/DO differs depending on the microprocessor interface format selected by
CKSEL.
CKSEL
Format
SRDT/DO
L
Figure 2
Open-drain output
H
Figure 3
Three-state output
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