Sabre32 Reference Datasheet

CONFIDENTIAL ADVANCE

INFORMATION Rev. 1.2

February 11, 2010

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20

Vista™

High Definition

Vista™

High Definition

Register 31-28: DPLL_NUM

This is a read-only 32bit value that can be used to calculate the sample rate. The sample rate can be

calculated using: Fin = (DPLL_NUM * Fcrystal) / 2

32 . F

in must be divided by 64 for I

2S data. Reg 31 are the

MSB’s, Reg 28 are the LSB’s

Register #37

(default = 8’b00000000)

[7:6]

RESERVED

[5]

stage1_prog_coeff_enabled

1'b1 => The stage 1 interpolating FIR filter will use the downloaded (custom) coefficients.

1'b0 => The stage 1 interpolating FIR filter will use the built-in coefficients.

[4]

stage1_programming_enabled

1'b1 => The stage 1 coefficients are set for writing. This bit must be enabled prior to

programming the stage 1 FIR coefficients.

1'b0 => The stage 1 coefficients are not set for writing.

[3:2]

RESERVED

[1]

stage2_prog_coeff_enabled

1'b1 => The stage 2 FIR filter will use the downloaded (custom) coefficients.

1'b0 => The stage 2 FIR filter will use the built-in coefficients.

[0]

stage2_programming_enabled |

1'b1 => The stage 2 coefficients are set for writing. This bit must be enabled prior to

programming the stage 2 FIR coefficients.

1'b0 => The stage 2 coefficients are not set for writing.

Register #41-38: Stage 1 FIR Coefficients

These 32 bits are used for writing the stage 1 FIR coefficients. See the programming section for more

information. Reg 41 are the MSB’s, Reg 38 are the LSB’s

Register #45-42: Stage 2 FIR Coefficients

These 32 bits are used for writing the stage 2 FIR coefficients. See the programming section for more

information. Reg 45 are the MSB’s, Reg 42 are the LSB’s

Register #71-48: SPDIF Channel Status Data

These registers allow read back of the SPDIF channel status. The status definition is different for the

consumer configuration (Table 7) and professional configuration (Table 8)

Reg 71 are the MSB’s, Reg 48 are the LSB’s Format is [191:0]