Datasheet

SRC4392

SBFS029D –DECEMBER 2005–REVISED DECEMBER 2012

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Bit 7 (MSB) Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 (LSB)

D7 D6 D5 D4 D3 D2 D1 D0

Registers 0x0F through 0x11 are utilized to program PLL1 in the DIR core. PLL1 multiplies the DIR reference

clock source to an oversampling rate which is adequate for AES3 decoder operation. PLL1 is programmed

using the following relationship:

(CLOCK × K) / P = 98.304MHz

where:

CLOCK = frequency of the DIR reference clock source.

K = J.D, where the integer part J = 1 to 63, and the fractional part D = 0 to 9999.

P = the pre-divider value, which may be set to any 4-bit value that meets the conditions stated below.

The following conditions must be met for the values of P, J, and D:

If D = 0, then: If D ≠ 0, then:

2 MHz ≤ (CLOCK / P) ≤ 20 MHz and 4 ≤ J 10 MHz ≤ (CLOCK / P) ≤ 20 MHz and 4 ≤ J

≤ 55. ≤11.

Referring to registers 0x0F through 0x11:

P is programmed using bits P[3:0].

J is programmed using bits J[5:0].

D is programmed using bits D[13:0].

Table 4 shows values for P, J, and D for common DIR reference clock rates.

Table 4. PLL1 Register Values for Common Reference Clock Rates

REFERENCE CLOCK RATE (MHz) P J D ERROR (%)

8.1920 1 12 0 0.0000

11.2896 1 8 7075 0.0002

12.2880 1 8 0 0.0000

16.3840 1 6 0 0.0000

22.5792 2 8 7075 0.0002

24.5760 2 8 0 0.0000

27.0000 2 7 2818 0.0003

Bit 7 (MSB) Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 (LSB)

0 0 0 0 0 0 DTS CD/LD IEC61937

IEC61937 This bit is utilized to indicate the detection of an IEC 61937 data reduced audio format (includes

Dolby AC-3, DTS, etc.) for DVD playback or general transmission purposes.

IEC61937 Status

0 Data is not an IEC61937 format.

Data is an IEC61937 format. Refer to the PC and PD preamble

1 registers (addresses 0x29 through 0x2C) for data type and

burst length.

DTS CD/LD This bit is used to indicate the detection of a DTS encoded audio compact disc (CD) or

Laserdisc (LD) playback.

DTS CD/LD Status

0 The CD/LD is not DTS encoded.

1 DTS CD/LD playback detected.

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