CS8422-DNZ Cirrus Logic Inc, CS8422-DNZ Datasheet - Page 35

• Manufacturer Part Number: CS8422-DNZ
• Description: IC 24-bit 192kHz SRC S/PDIF Receiver
• Manufacturer: Cirrus Logic Inc

DS692PP1
made available to qualify the C and U data output. In serial port slave mode, VLRCK and RCBL can be
made available to qualify the C and U data output. VLRCK is a virtual word clock, equal to the receiver
recovered sample rate, that can be used to frame the C/U output. VLRCK and RCBL are available through
the GPO pins.
C-data or U-data with either OLRCK1 or OLRCK2, the corresponding serial port must be directly sourced
by the AES3 receiver (not the SRC).
To source an SDOUT signal directly from the RX receiver, the receiver should be set in master mode in
order to recover the received data. In this configuration, the SDOUT signal sourced from the receiver will
toggle at the AES frame rate. If the RX receiver is set to slave mode, the user must ensure that its asso-
ciated input OLRCK signal is externally synchronized to the input S/PDIF stream in order to recover the
received data. In both configurations, VLRCK is equal to the OLRCK signal associated with the serial port
used to clock the recovered receiver data.
When both SDOUTs are sourced from the RX receiver, VLRCK will equal OLRCK1. When both SDOUTs
are sourced from the SRC, then VLRCK will equal the recovered AES frame rate, not OLRCK.
The user may also access all of the C and U bits directly from the output data stream (SDOUT) by setting
bits SOFSELx[1:0]=11 (AES3 Direct mode) in
rial Audio Output Data Format - SDOUT2
signal by external control logic such as a DSP or microcontroller. AES3 Direct mode is only valid if the
serial port in question is directly sourced by the AES3 receiver (not the SRC).
If the incoming User data bits have been encoded as Q-channel subcode, the data is decoded, buffered,
and presented in 10 consecutive register locations located in
An interrupt may be enabled to indicate the decoding of a new Q-channel block, which may be read
through the
The encoded Channel Status bits which indicate sample word length are decoded according to
AES3-2003 or IEC 60958. The number of auxiliary bits are reported in bits 7 through 4 of the
Channel Status
“Interrupt Status (14h)”
Figure 19
(11h)”.
SDOUT1
SRC
SRC
RX
RX
illustrates timing of the C and U data, and their related signals. To recover serial
SDOUT2
SRC
SRC
register.
RX
RX
Table 1. VLRCK Behavior
(0Dh)”. The appropriate bits can be stripped from the SDOUT
“Serial Audio Output Data Format - SDOUT1 (0Ch)”
AES FRAMES
OLRCK1
OLRCK1
OLRCK2
VLRCK
“Q-Channel Subcode (19h - 22h)”
see
see
see
see
COMMENT
(Note 4)
(Note 4)
(Note 4)
(Note 6)
CS8422
“Receiver
register.
or
“Se-
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