YSS952 datasheet(68/116 Pages) YAMAHA

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3 FUNCTION DESCRIPTION

YSS952

6SS952A30

3.5.4.2.5

Updating PEQ Coefficients RAM

Updating Coefficients When SDSP is Not Running.

The coefficients RAM for PEQ Band0–9 (0x8000–0x8045) can be directly updated. Simply write new

coefficients in these locations.

Updating Coefficients When DSP is Running.

The flow chart below shows the procedure:

[Note 1] See "3.2.3.1.4

On-Chip RAM Access".

[Note 2] See "3.5.4.2.4

PEQ Coefficients Buffered Transfer Parameters/Transfer Execution".

Band 0: PEQAD [6:0] = 0x00

Band 1: PEQAD [6:0] = 0x05

Band 2: PEQAD [6:0] = 0x0A

Band 3: PEQAD [6:0] = 0x0F

Band 4: PEQAD [6:0] = 0x14

Band 5: PEQAD [6:0] = 0x19

Band 6: PEQAD [6:0] = 0x1E

Band 7: PEQAD [6:0] = 0x28

Band 8: PEQAD [6:0] = 0x32

Band 9: PEQAD [6:0] = 0x3C

Start

All coefficients transferred?

Sequentially write new coefficients for one

band in the following order, to the area

starting from the top address (0x8046) of the

PEQ coefficient transfer buffer. [Note 1]

a0[23:0], a1[23:0], a2[23:0], b1[23:0],

b2[23:0]

Transfer Parameters / Transfer Execution

Writes 0 (COEFNUM) and PEQAD[6:0] to

the On-Chip RAM address 0x8050.

[Note 2]

End

Bands 0–5 coefficient change?

YES

Sequentially write coefficients to be updated

for one band in the following order, to the area

starting from the top address (0x8046) of the

PEQ coefficient transfer buffer. [Note 1]

a0[47:24], a1[47:24], a2[47:24], b1[47:24],

b2[47:24], a0[23:0], a1[23:0], a2[23:0],

b1[23:0], b2[23:0]

Transfer Parameters / Transfer Execution

Writes 1 (COEFNUM) and PEQAD[6:0] to the

On-Chip RAM address 0x8050.

[Note 2]

NO (Bands 6–9 coefficient change)

YES

YSS952 Datasheet(PDF) 68 Page - YAMAHA CORPORATION

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