Re: HDD (or flash) instead of a CD, questions...
Posted: Wed Jun 21, 2017 2:45 pm
yes, it's why this one was a problem for me... I didn't see the link between WFCK / LRCK /... and this one
Sega Megadrive/Genesis development
http://gendev.spritesmind.net/forum/
http://gendev.spritesmind.net/forum/viewtopic.php?f=13&t=793
Beware that this last diagram is about different signals (SQCK/SQDT)- also present on CXD2500 chip (the latter is just named SQSO) - which are dedicated to Q-channel (with CRC verification): that was is used by CDD (4-bit microprocessor) to retrieve the TOC and Track infos. These signals are not the ones used by Mega CD ASIC to get subcodes.It's not exactly the same (it push Q first, not P) but i think I got it know, based on previous post
Yes , 2352bytes per sector / 98 frames = 24bytes per frameHardWareMan 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.
Oh oh!!HardWareMan wrote:I have MD1 and I can make some records for you.
Code: Select all
1 - CDCK (D-->H) CD mechanism control communication clock
2 - D/M (D-->H) Mute, output '0' for playback and '1' for mute
3 - nIRQ (D-->H) Interrupt request
4 - nRES (D<--H) Reset the CD hardware
5 - HOCK (D<--H) Host communication clock
6 - DB0 (D<->H) Data bus bit 0
7 - DB1 (D<->H) Data bus bit 1
8 - DB2 (D<->H) Data bus bit 2
9 - DB3 (D<->H) Data bus bit 3
10 - C2PO (D-->H) Error flag, outputs '1' when data correction is disabled
11 - BCLK (D-->H) Audio sample bit clock
12 - SDATA (D-->H) Audio sample serial data
13 - LRCK (D-->H) Left/Right channel identification clock
14 - DFCK (D-->H) 16.9344MHz clock output for DAC
15 - N.C. (D x H) Not connected
16 - N.C. (D x H) Not connected
17 - EXCK (D<--H) Sub-code read clock
18 - SBSO (D-->H) Sub-code data
19 - N.C. (D x H) Not connected
20 - SCOR (D-->H) Sub-code sync
21 - GND (D---H) Digital ground
22 - WFCK (D-->H) Frame clock
23 - VCC (D---H) VCC +5V digital power
24 - MVCC (D---H) VCC +9V motor power
25 - SGND (D---H) Motor ground