CS47L24 datasheet(89/256 Pages) CIRRUS

89 / 256 page

CS47L24

Rev 4.1

The Isochronous Sample Rate Converter (ISRC) signal paths and control registers are illustrated in Figure 29.

CS47L24 supports 3 ISRC blocks, ie. n = 1, 2 or 3

ISRCn_INT2_ENA

ISRCn_INT3_ENA

ISRCn_INT4_ENA

ISRCn_INT1_ENA

ISRCnINT1_SRC

ISRCnINT3_SRC

ISRCnINT4_SRC

ISRCnINT2_SRC

ISRC1 INT1 (A0h)

ISRC2 INT1 (A8h)

ISRC3 INT1 (B0h)

ISRC1 INT2 (A1h)

ISRC2 INT2 (A9h)

ISRC3 INT2 (B1h)

ISRC1 INT3 (A2h)

ISRC2 INT3 (AAh)

ISRC3 INT3 (B2h)

ISRC1 INT4 (A3h)

ISRC2 INT4 (ABh)

ISRC3 INT4 (B3h)

ISRCn_DEC2_ENA

ISRCn_DEC3_ENA

ISRCn_DEC4_ENA

ISRCn_DEC1_ENA

ISRCnDEC1_SRC

ISRCnDEC3_SRC

ISRCnDEC4_SRC

ISRCnDEC2_SRC

ISRC1 DEC1 (A4h)

ISRC2 DEC1 (ACh)

ISRC3 DEC1 (B4h)

ISRC1 DEC2 (A5h)

ISRC2 DEC2 (ADh)

ISRC3 DEC2 (B5h)

ISRC1 DEC3 (A6h)

ISRC2 DEC3 (AEh)

ISRC3 DEC3 (B6h)

ISRC1 DEC4 (A7h)

ISRC2 DEC4 (AFh)

ISRC3 DEC4 (B7h)

ISRCn_FSL

ISRCn_FSH

The ISRC provides synchronous conversion between two sample rates on either the SYSCLK or ASYNCCLK domain.

ISRCn_FSL identifies the lower of the two sample rates.

ISRCn_FSH identifies the higher of the two sample rates.

Both sample rates must be referenced to the same clock domain (SYSCLK or ASYNCCLK).

Figure 29 Isochronous Sample Rate Converters (ISRCs)

The ISRC input control registers (see Figure 29) are located at register addresses R2816 (B00h) through to R3000

(0BB8h).

The full list of digital mixer control registers is provided in the “Register Map” section (Register R1600 through to R3000).

Generic register definitions are provided in Table 7.

The *_SRC registers select the input source(s) for the respective ISRC processing blocks. Note that the selected input

source(s) must be configured for the same sample rate as the ISRC to which they are connected.

The bracketed numbers in Figure 29,

e.g.,”(A4h)” indicate the corresponding *_SRC register setting for selection of that

signal as an input to another digital core function.

The register bits associated with the ISRCs are described in Table 23.

CS47L24 Datasheet(PDF) 89 Page - Cirrus Logic

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