Search found 1115 matches

by KanedaFr
Thu Jun 29, 2017 2:15 pm
Forum: Hardware
Topic: HDD (or flash) instead of a CD, questions...
Replies: 140
Views: 39061

Re: HDD (or flash) instead of a CD, questions...

OK. I think we can do first approach to make FLASH player of CD image. The only thing is still undiscovered is set of commands and statuses on control 4 bit bus. I think it's not that hard... difficult for someone like me who'll need to learn VHDL & FPGA at the same time (in progress...very interes...
by KanedaFr
Thu Jun 29, 2017 2:10 pm
Forum: Hardware
Topic: HDD (or flash) instead of a CD, questions...
Replies: 140
Views: 39061

Re: HDD (or flash) instead of a CD, questions...

Same here (no audio disk -> audio disk load -> audio disc play) so subchannel data is sent even when SCOR occurs, thanks ! What I can't explain is why SCORE is ONE WFCK only and not TWO (S0 & S1) i don't understand... You can use my captured data to decode playing time and other control data. Just ...
by KanedaFr
Thu Jun 29, 2017 1:58 pm
Forum: Hardware
Topic: HDD (or flash) instead of a CD, questions...
Replies: 140
Views: 39061

Re: HDD (or flash) instead of a CD, questions...

I've got it. The CD track is kind of tape with 74/80/99 minutes of play, digitally. So, when it carries an audio data, there no need a perfect sync, so rough time coordinate is M:S:F format in subchannel. When they turn the audio CD to the data CD, there must be more accurate sync to the "tape". So...
by KanedaFr
Thu Jun 29, 2017 12:01 pm
Forum: Hardware
Topic: HDD (or flash) instead of a CD, questions...
Replies: 140
Views: 39061

Re: HDD (or flash) instead of a CD, questions...

Did you saw this diagrams before (they come from Mega CD 1 manual)? Sure it was my first source of info ;) and the Mega CD2 manual got some more It seems that 48 bits in transaction, 24 bit for every channel and it is use 16 bit with right align and sign extend (D16...D23 is copy of D15). yes, 16bi...
by KanedaFr
Thu Jun 29, 2017 11:53 am
Forum: Controls
Topic: controller auto reset
Replies: 18
Views: 3038

Re: controller auto reset

It's exactly because of the 6B joypad that I asked this.

From what i know,

Code: Select all

asking ABC
wait vlank
asking XYZ
won't work

I remember a talk about how fast the reading should be to avoid "reset" for 6B pad, multiplayer,, .....
by KanedaFr
Wed Jun 28, 2017 10:33 pm
Forum: Blabla
Topic: FPGA 5V
Replies: 9
Views: 2403

Re: FPGA 5V

It became very difficult if I have

MD_5V <=>level shifter <=>FPGA 3.3V<=>level shifter <=>DEVICE_5V ;(

I read something about a Cypress PSoC 5V which include a µC and some king of FPGA...need to find it and get more details
by KanedaFr
Wed Jun 28, 2017 10:28 pm
Forum: Controls
Topic: controller auto reset
Replies: 18
Views: 3038

controller auto reset

Controller data is read by switching TL/TH
You have to switch them an even times.

What would happen if, by mistake, I switch them an odd times?
has the controller somekind of reset-to-defaut-after-X-ns feature ? or will my read be bugged for the rest of the game ? ;)
by KanedaFr
Wed Jun 28, 2017 10:24 pm
Forum: Hardware
Topic: HDD (or flash) instead of a CD, questions...
Replies: 140
Views: 39061

Re: HDD (or flash) instead of a CD, questions...

If you can log every pin, you'll make my day !!
yes, I'm, for now, interesting by the flow on this FFC.

i was planning to remove the faceplate to get access to the pins while power on, not easier ?
by KanedaFr
Wed Jun 28, 2017 5:32 pm
Forum: Hardware
Topic: HDD (or flash) instead of a CD, questions...
Replies: 140
Views: 39061

Re: HDD (or flash) instead of a CD, questions...

Making the log request below ( :oops: ), I suddenly realize the sync words are 14 bits
I don't know how they will be converted to 8 bits (14 bits EFM -> 8 bits data) :(
by KanedaFr
Wed Jun 28, 2017 5:27 pm
Forum: Hardware
Topic: HDD (or flash) instead of a CD, questions...
Replies: 140
Views: 39061

Re: HDD (or flash) instead of a CD, questions...

I have MD1 and I can make some records for you. Oh oh!! Don't say me that, I have a open list ;) I'd like the timing 1/ about the 4 pins related to SubCode - WFCK - EXCK - SCOR - SBSO I really want to see if SCOR is 2 or 1 WFCK long It would be perfect if logging SBSO could help to identify the syn...
by KanedaFr
Tue Jun 27, 2017 11:06 pm
Forum: Blabla
Topic: FPGA 5V
Replies: 9
Views: 2403

FPGA 5V

Does anyone know any FPGA or CPLD still 5V tolerant ?
It seems they're no longer available :(

And I'd like to avoid all the 3.3V level converting things...my goal is to increase my MCD life, not to make it commit suicide ;)
by KanedaFr
Tue Jun 27, 2017 10:56 pm
Forum: Controls
Topic: ID ?
Replies: 3
Views: 999

ID ?

It's probably a newb-level question but I should ask it ;) As you know, every input device has its own ID, which make it possible to detect what is connected to each port. What I never understood is how this Peripheral ID is "set" inside the device. By this, I mean there isn't a complex µC or CPLD (...
by KanedaFr
Sun Jun 25, 2017 10:06 am
Forum: Hardware
Topic: HDD (or flash) instead of a CD, questions...
Replies: 140
Views: 39061

Re: HDD (or flash) instead of a CD, questions...

OK, i know understand the meaning of every pin http://gendev.spritesmind.net/img/tech/megasd/mcd_connector.png with some check about the sucode part, I'm now trying to find how all of this is synchronized... the Communication part is defined by a IRQ every 1/75s (every sector) :arrow: I read an old ...
by KanedaFr
Sun Jun 25, 2017 9:37 am
Forum: Hardware
Topic: HDD (or flash) instead of a CD, questions...
Replies: 140
Views: 39061

Re: HDD (or flash) instead of a CD, questions...

HardWareMan wrote:Every frame of 98 contains not only subchannel data but left and rigth channel samples. I don't remember how much but I guess 6 of each. 44100 / 75 / 98 = 6. 6 * 2 * 2 = 24 bytes.
Yes , 2352bytes per sector / 98 frames = 24bytes per frame
by KanedaFr
Sat Jun 24, 2017 12:03 am
Forum: Hardware
Topic: HDD (or flash) instead of a CD, questions...
Replies: 140
Views: 39061

Re: HDD (or flash) instead of a CD, questions...

I assumed it was this basic serialization of each of the 2+96 each subdata....
But the datasheet just killed me !

What's not clear is : Is SCOR high for 2 frame (S0 and S1) or only S1 ......