Datasheet
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SRC4382
SBFS030C – JANUARY 2006 – REVISED SEPTEMBER 2007
Register 11: Receiver PLL1 Configuration Register 3
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 נ 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 ≤ 55. 10 MHz ≤ (CLOCK / P) ≤ 20 MHz and 4 ≤ J ≤ 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
Register 12: Non-PCM Audio Detection Status Register (Read-Only)
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 registers (addresses 0x29
1
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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