CS8422 datasheet(32/82 Pages) CIRRUS

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DS692PP2

CS8422

frequencies will be derived from the XTI-XTO clock when clock switching has taken place and the RMCK-

to-LRCK ratio will be maintained.

When clock switching is not enabled and the PLL has lost lock, RMCK will be derived from the VCO idle

frequency. The frequency of the RMCK output will be still be determined by the ratio selected by the RM-

CK[2:0] bits in register 09h, or the MS_SEL pin in Hardware Mode. When the PLL has lost lock, the VCO

idle frequency is equivalent to AES3 input data with Fs

≅ 54 kHz ± 5% (or ISCLK ≅ 3.456 MHz ± 5%).

6.4.1

Hardware Mode Control

In Hardware Mode, XTI System Clock Mode is always enabled.

6.4.2

Software Mode Control

In Software Mode, XTI System Clock Mode is controlled through the register described in Section 11.2

“Clock Control (02h)” on page 47.

6.5

AES11 Behavior

When an AES3-derived OLRCK is configured as a master, the rising or falling edge of OLRCK (depending

on the serial port interface format setting) will be within -1.5%(1/Fs) to 1.5%(1/Fs) from the start of the pre-

amble X/Z. In master mode, the latency through the receiver depends on the input sample frequency. In

master mode the latency of the audio data will be 3 frames in AES3 direct mode, and 4 frames in all other

cases.

When an AES3-derived OLRCK is configured as a slave, any synchronized input within +/-25% of an AES3

frame from the positive or negative edge of OLRCK (depending on the serial port interface format setting)

will be treated as being sampled at the same time. Since the CS8422 has no control of the OLRCK in slave

mode, the latency of the data through the part will be a multiple of 1/Fs plus the intrinsic delay between OL-

RCK and the preambles also present in master mode.

Both of these conditions are within the tolerance range set forth in the AES11 standard.

6.6

Error and Status Reporting

While decoding the incoming bi-phase encoded data stream, the CS8422 has the ability to identify various

error conditions. Refer to Sections 6.6.1 and 6.6.2 for details.

6.6.1

Software Mode

Software Mode allows the most flexibility in reading errors. When unmasked, bits in the Receiver Error

QCRC – CRC error in Q subcode data.

CCRC – CRC error in channel status data.

UNLOCK – PLL is not locked to incoming bi-phase data stream, or 2 valid Z preambles have not yet

been detected.

V – Data Validity bit is set.

CONF – The input data stream may be near error condition due to jitter degradation.

BIP – Bi-phase encoding error.

PAR – Parity error in incoming data.

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