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av:snes_sp_dif [2005/10/30 11:36] – Moved and fixed images. nfgav:snes_sp_dif [2019/08/27 20:45] (current) – external edit 127.0.0.1
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 Before you go any further, you need to find out what kind of APU you have. Before you go any further, you need to find out what kind of APU you have.
  
-I'm assuming you already have a 4.5mm Nintendo screwdriver bit, otherwise you're going to have some difficulty getting into your SNES.  Remove the six screws from the bottom, then take the top of the deck off.  If you live in North America, you'll likely be presented with one of the two images: +I'm assuming you already have a 4.5mm Nintendo screwdriver bit, otherwise you're going to have some difficulty getting into your SNES.  Remove the six screws from the bottom, then take the top of the deck off.  If you live in North America, you'll likely be presented with one of the two images: 
 {{av:apu-module.jpg}} {{av:apu-onboard.jpg}} {{av:apu-module.jpg}} {{av:apu-onboard.jpg}}
  
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 Rather than draw up a schematic, I've made a table of the pins you need to connect.  The S-DSP column contains the pins you need to connect to if you have a two chip APU, and the S-APU column contains the pins you need to connect to if you have a single chip APU. Rather than draw up a schematic, I've made a table of the pins you need to connect.  The S-DSP column contains the pins you need to connect to if you have a two chip APU, and the S-APU column contains the pins you need to connect to if you have a single chip APU.
-[quote] +<code> 
-S-DSP S-APU CS8405A Pin +S-DSP S-APU CS8405A  Pin 
-33 3 +5VDC  1    COPY/C [CS bit 2] Copyright = 1 (allow copying) +33 3 +5VDC  1    COPY/C [CS bit 2] Copyright = 1 (allow copying) 
- 2 VL2+ + 2 VL2+ 
- 3 EMPH [CS bits 3-5] Emphasis = 0 (no emphasis) + 3 EMPH [CS bits 3-5] Emphasis = 0 (no emphasis) 
- 4 SFMT0 Data input is 16-bits right justified + 4 SFMT0 Data input is 16-bits right justified 
- 5 SFMT1 " " + 5 SFMT1 " " 
- 6 VD+ + 6 VD+ 
- 11 TCBLD TCBL is output + 11 TCBLD TCBL is output 
- 20 VL3+ + 20 VL3+ 
- 23 VL+ + 23 VL+ 
- 24 H/S Select hardware mode for controlling channel-status (CS) bit + 24 H/S Select hardware mode for controlling channel-status (CS) bit 
- 27 VL4++ 27 VL4+
    
-52 95 GND<sup>1</sup> 7 DGND4 +52 95 GND(1) 7 DGND4 
- 8 DGND3 + 8 DGND3 
- 10 APMS Set data input to slave mode (input is controlled by ISCLK) + 10 APMS Set data input to slave mode (input is controlled by ISCLK) 
- 16 CEN Select hardware mode A for setting channel status + 16 CEN Select hardware mode A for setting channel status 
- 17 V [Validity bit] Sub-frame contains valid sample data + 17 V [Validity bit] Sub-frame contains valid sample data 
- 18 U [User bit] Always 0 + 18 U [User bit] Always 0 
- 19 AUDIO<sup>2</sup>  [CS bit 1] Non-Audio = 0 (block contains audio data) + 19 AUDIO(2)  [CS bit 1] Non-Audio = 0 (block contains audio data) 
- 22 DGND + 22 DGND 
- 28 ORIG [CS bits 0 & 15] Pro = 0 (consumer format), L (Category Code MSB) = 0 (original recording)+ 28 ORIG [CS bits 0 & 15] Pro = 0 (consumer format), L (Category Code MSB) = 0 (original recording)
    
-47 16 RST  9 RST Reset +47 16 RST  9 RST Reset 
-43 94 32kHz  12 ILRCK Left/Right sample clock+43 94 32kHz  12 ILRCK Left/Right sample clock
 42 92 1.536MHz 13 ISCLK Sample bit clock 42 92 1.536MHz 13 ISCLK Sample bit clock
-44 93 DATA  14 SDIN Sample data input+44 93 DATA  14 SDIN Sample data input
 78 52  8.192MHz    21 OMCK Master clock 78 52  8.192MHz    21 OMCK Master clock
    
-Not connected  15 TCBL +Not connected  15 TCBL 
- 25 TXN+ 25 TXN
    
-Output  26 TXP S/PDIF output +Output  26 TXP S/PDIF output 
-[/quote]+</code>
 <sup>1</sup> Instead of grounding to the DSP, I soldered pin 28 of the CS8405A to the mainboard and tied all grounds there.  This doubled as a way to anchor the chip. <sup>1</sup> Instead of grounding to the DSP, I soldered pin 28 of the CS8405A to the mainboard and tied all grounds there.  This doubled as a way to anchor the chip.
  
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 Copyright ©2003 Alpha-II Productions Copyright ©2003 Alpha-II Productions
 +
 +==== Using a CS8406 ====
 +
 +As the CS8405 is getting hard to get these days, here's a connection diagram for the CS8406.
 +
 +{{av:snes_da_chip.gif}}
 +
 +And I thought a pic of the pins on the DSP might be useful.
 +
 +{{av:snes_s-dsp.jpg}}
 +
 +The clock, data, and reset pins are all in the same place.  just a couple differences in what goes to ground / Vcc. In regards to the AUDIO pin note above, the CS8406 datasheet is corrected with the AUDIO line low for valid audio data.
 +
 +I got so frustrated trying to solder wires to the DSP inside the APU can I ended up giving up on analog audio and lifting the pins. Don't do this! This will result in a nice black screen. It's all better now.
av/snes_sp_dif.1130636182.txt.gz · Last modified: 2019/08/27 20:44 (external edit)