BD9406KS2 Datasheet, PDF (32/38 Pages) Rohm – 28bit Audio DSP with Built-in 2ch ADC, 6ch DAC and ASRC

BU9406KS2
Technical Note
7. Commands Transmitted after Reset Release
(1) The following commands must be transmitted after reset release, including after power supply stand-up.
0．Turn power on.
↓
○Wait approximately 1ms until oscillation is stable. (The time to stabilization should be adjusted according to the
pendulum product.)
↓
1 Reset release
↓
○Wait approximately 500us until RAM initialization is complete.
↓
2．&h01[7] = 0: The internal RAM is cleared, resulting in usable state.
↓
3．&hF1[2] = 0: Signals from the analog block are connected to the digital block.
↓
4．&hF5[5:4] = 0: Configure PLL clock to regular use state. (&hF5=00)
↓
5．&hF6[7:0] = AAh: Performs phase focusing of the clock output from PLL.
↓
6．Configure the default value (24’h200000) to parametric equalizer coefficient b0 (refer to (2) for procedure).
↓
○Wait approximately 10ms until PLL is stable.
↓
7．Configuration of other registers.
（２） 6．Procedure to configure default value (24’h200000) to parametric equalizer coefficient b0
6-1．&h42[7:0] = 20h
↓
: Configure 20h to bit [23:16] of 24bit coefficient to be loaded.
6-2．&h41[7:0] = **h : Appoint coefficient address. (i.e.) Configure 28h to b0 of filter number 1.
↓
6-3．&h40[7] = 1
↓
○Wait approximately 20us
↓
: Begin coefficient load.
6-4．&h40[7] = 0
: Stop coefficient load.
Repeat steps 6-2 through 6-4 19 times, each time changing the filter coefficient b0 address.
N0. &h41[7:0] = **h
1
28h
2
2Dh
3
32h
4
37h
5
68h
6
00h
7
05h
8
0Ah
9
0Fh
10
14h
11
19h
12
1Eh
13
40h
14
45h
15
4Ah
16
4Fh
17
54h
18
59h
19
5Eh
Parametric Equalizer Filter Numbers
Filter Number 1 (Lch/Rch common coefficient b0)
Filter Number 2 (Lch/Rch common coefficient b0)
Filter Number 3 (Lch/Rch common coefficient b0)
Filter Number 4 (Lch/Rch common coefficient b0)
Filter Number 5 (Lch/Rch common coefficient b0)
Filter Number 6 (Lch coefficient b0)
Filter Number 7 (Lch coefficient b0)
Filter Number 8 (Lch coefficient b0)
Filter Number 9 (Lch coefficient b0)
Filter Number A (Lch coefficient b0)
Filter Number B (Lch coefficient b0)
Filter Number C (Lch coefficient b0)
Filter Number 6 (Rch coefficient b0)
Filter Number 7 (Rch coefficient b0)
Filter Number 8 (Rch coefficient b0)
Filter Number 9 (Rch coefficient b0)
Filter Number A (Rch coefficient b0)
Filter Number B (Rch coefficient b0)
Filter Number C (Rch coefficient b0)
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
32/34
2012.03 - Rev.A