WM8802SCFTV datasheet(27/65 Pages) WOLFSON

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WM8802

PP Rev 1.1 April 2004

MUX

(8in / 2out)

DIR

RX0

RX1

RX2

RX3

RX4

RX5

RX6

RDATA

RXOUT

TXO

DIT

TDATA

SDIN

[RDTSEL]

[TDTSEL]

Figure 19 Data Block Diagram

CALCULATION OF INPUT DATA SAMPLING FREQUENCY

The input data sampling frequency is calculated using the XIN clock.

When the oscillation amplifier automatically stops during PLL lock, the input data sampling frequency

is calculated during the RERR error period. The calculation is completed at the same time that the

oscillation amplifier stops. The value remains unchanged until the PLL becomes unlocked.

In the mode where the oscillation amplifier operates continuously, calculation processing is

performed continuously The calculation results (which follows the input data) can be read even if

sampling rate is changed within the PLL capture range, but only for a signal where channel status

sampling information does not change,.

The calculation result can be read from CCB address 0xEB and output to registers DO4 to DO7 and

DO8 to DO15. Registers DO4 through DO7 hold the encoded result, while DO8 through DO15 hold

the calculation value. The sampling frequencies that can be calculated are greater than 24kHz as the

calculation count value is output in 8-bit units. For details, see section Micro-controller Interface.

ERROR OUTPUT PROCESSING

LOCK ERROR, DATA ERROR OUTPUT (RERR)

An error flag RERR is output when a PLL lock error or a data error occurs.

Non-PCM data reception can be treated as an error with the RESEL setting.

The RERR output conditions are set using RESTA. Since the PLL status can be output at any time,

the PLL status can be monitored even when the clock source is XIN.

WM8802SCFTV датащи(PDF) 27 Page - Wolfson Microelectronics plc