Converting IIS output to SPDIF

I have finally found the IIS pads on the Empeg MK 2 board. Now the question is how to go from IIS to the inputs on a CS8405 chip for purposes of an SPDIF output on the Empeg. What circuitry is needed to take the IIS output and interface with the serial data and word rate clock inouts on the CS8405? What do each of the 5 pads do on the Empeg (see attachment)? If I can figure this out, I am going to be building an add on SPDIF output board for my Rio Car.

What does it say on the board below you highlight? Something about the editor apoligizing to Mr. Muse for a T-shirt design???

I have used one of these chips on a similar project. Before you go too far check the CLK timings. On my project the CS8405 required a CLK which was a multiple of the I2C CLK signal which I could not find on the board (a digital satellite receiver). Other than this it is just a question of connecting pwr, gnd, I2C date/clock, master clk and then pulling the configuration pins high or low as required. Of course you have to put a SPDIF connector on as well. Sharp have a good one just three pins, pwr, gnd and SPDIF data. All the drive electronics are containd in the connector. Both parts cost me a total of around £25 ($35) in one off qty.

Of Course I would ask why you are doing this as buying a PC card with SPDIF out is the easier option :-)

You are correct about needing a 256fs clock, which is not present on the IIS pads - this was a bit of an oversight, sorry.

However, you should be able to run a flying lead to one end of the 11.2896mhz xtal (next to the DSP) from which the IIS clock is derived - and this will work just fine.

Hugo

I believe it says "The editors would like to extend their deepest apologies to Mr. Moss for wrongly attributing his work on the T-Shirt design to someone else in the previous issue.

Please rest assured that such an error will not happen again."

I am not aware of any pre-existing options for deriving digital audio output from the Empeg. That is why I am pursuing building a small board to connect to the IIS pads on the board. I still need to know what each of the IIS pads does on Empeg board. Could someone tell me what signal is present on each IIS pad (from top to bottom on the picture in my previos post) or do I need to investigate this with an o'scope? I must admit that at the moment all this seems a little overwhelming. I am not quite up to speed in electronics design and esp. digital circuits. My plan is to take the applicable circuitry presented in the CS8405 eval. board and build that.

The CS8405 has a 3 wire serial audio interface. What I need to know more than anything, is how to get the ILRCK (serial audio left/right clock), ISCLK (serial audio bit clock) and SDIN (serial audio data) signals into these pins on the CS8405 (pins 12-14) from the IIS pads. If someone could just tell me that, I would be on my way.

Thanks,

Stu

Indeed. Poor David!

All that remains to be seen now is who is willing to desolder their StrongARM to find out what is written underneath!

Rob

Probably "You're not supposed to be here. -Levelord".

Would that be where the "Ring 'O' Lights Technology" be located at????

Only on a mk1, remember....

Hugo

All that remains to be seen now is who is willing to desolder their StrongARM to find out what is written underneath!

I've always wondered if Patrick left any secret messages on the other layers as well.

I've always wondered if Patrick left any secret messages on the other layers as well.

That's a secret I'll take with me...

Patrick

That's a secret I'll take with me...

..or I could just sneak a look in Ranger the next time I visit.

Rob

The X ray machine at the airport would probably work. no? Who works at an airport?

Wouldn't all the components and the other layers make the xray hard to look at? Hey... Who needs the illuminated button hack if the entire empeg glows in the dark anyway!

By the looks of it, the only person who would be able to unsolder everything and then also have the necessary skill to put all back would be Patrick...

- Trevor

Ahh, the knack is to club together to buy an empeg solely for this purpose. Patrick would be so upset by the destruction of excellent technology that he'd tell us the secret messages if we promised not to harm the empeg.

Patrick would be so upset by the destruction of excellent technology

Patrick has destroyed any amount of excellent technology in his time..

Rob

What's sort of impressive about all this is that no one has a dead empeg sitting around. I'd think out of all the units shipped someone would have one that their dog had chewed up that they'd willing to donate to the persuit of knowledge.

Matthew

Judging by current prices for an empeg, I'd say the dog would be donated in pursuit of knowledge if it mangled it's owners empeg that badly (Not that I'm saying giving away/harming your dog is something you should do)

If the empeg was broken then most people would have sent it back to empeg to be fixed. Not people would leave it around for scrap.

- Trevor

There is at least one "scrap" empeg around. I was going to buy a "spare" empeg from some guy on the bbs, but he dropped his main unit down the stairs and killed it.

He told me he couldn't be bothered to claim on his insurance and get the dead one fixed. A crime I tell you, a crime...

P.S. He said it made a very large dent in the wall that stopped it's descent !

Ouch!

Wonder if he still has it. It may become very valuable later on when people's warranties run out and they need spare bits and don't want to send it to Empeg.

- Trevor

Wow, it took a few years for someone to (accidently) post a cnear enough picture of the writing on the PCB.

That reminds me that I need to use my new digital camera to take a picture of the Mark 2 and 2a for my personal photo album.

Never did look at the Mark 1 though. I sold it while it was still in warranty.

Actually, I sort of left the writing visible in the file intentionally, although maybe if I hadn't, someone would have enlightened me as to the signal present on each of the IIS pads. Surely someone must know. I am in the process of putting together a S/PDIF board. Parts are on order, but I don't yet know if I'll be able to interface the board I build with the Empeg board, without a clue on what each pad does.

Stu

Hi.

Never heard of the Search function on this BBS?
A search for "I2S" over all boards on this BBS returned Hugo's post with the pinouts as one of the first links.

cu,
sven

I tried the search function many times, but never came across that particular message. The results are dependent on the inputs of course, and I don't believe I ever searched for "I2S", as the Empeg board says "IIS" right on it. A search for digital out also failed to return that post. Anyway, thanks for the reply. It should be what I need.

Stu

Oh well, the good old searching problem: You have to know what to look for before you can actually search for it.

But anyhow, as I2S was also mentioned (either in this thread or in my thread about possible I2S-to-SP/DIF kits), I somehow wonder why you missed that as a search criterium. Ah, never mind. Glad I was able to help.

cu,
sven

Only because there were two things in your post, but:

That's ``S/PDIF''

and

That's ``criterion''.

Sorry. BTW, I don't know if you're exaggerating in your responses to Justin, but, from reading your posts, I would never guess that English wasn't your first language.

That's ``S/PDIF''
and
That's ``criterion''.
Oh well, I was sure I spelled the first one right. Seems like I was wrong. And regarding criterion, I was almost certain that I spelled it wrong, but I was to lazy to look it up.

BTW, I don't know if you're exaggerating in your responses to Justin, but, from reading your posts, I would never guess that English wasn't your first language.

I do my best. But my first language really is german. I learned english for 9 years in school though, and spent about a month in UK and another 3 month in the US. During a two week exchange program with a school near Denver, a salesperson asked me wether I was from England. Seems like my spoken english isn't to bad either.
<rant>But anyway, I am not sure which responses to justin you are talking about. Was it in the thread about bad spelling making it hard for foreigners to understand the posts? I might have exaggerated in those posts, but only (very) little. I am usually quite good at figuring out what slang expressions mean, and about as good at figuring out what word was meant when it was misspelled, but at times, I find it harder to do that and actually can't figure it all out. The post I originally complained about was one of those where I had a particularly hard time understanding.</rant>

cu,
sven

As an American, it's always amusing to me to hear someone speak in a melange of their native and British accents. On the other hand, it would probably be equally as odd to hear an east Indian speak as if he'd learned English from an American, since they usually have British accents.

All I meant, really, was that if you hadn't ``outed'' yourself as a non-native English speaker, I never would have guessed. And I remembered one of those posts as when I initially discovered that. No offense intended.