Coolrunner dualboot. Relay help please

[smithisize]

So I have my dual boot setup running perfectly, using a coolrunner and a cygnos v2 rev d with the glitched image on the cygnos, the stock image onboard. It boots perfectly.

Now, though, I would like to install a relay that'll shut off the glitch chip when it's not needed (booting into normal dash for XBL). I've seen a tut on how to do it on a C-MOD board here:


But I haven't seen any info about doing it with a cool runner.

I know that if this gets screwed up, I could fry my on board TSOP or my cygnos, so I would appreciate any help, and I'm sure others will too!

Regards

Smith

[d4m4n]

I used a P-FET for turning of the Coolrunner. The P-FET cuts the 3.3V standby voltage.
I'll change the design when I next time open the console for LT+ 3.0 update.
I'll remove the P-FET and use a tristate buffer instead on the POST signal.

http://www.xboxhacker.org/index.php?topic=17584.msg132399#msg132399

[peshkohacka]

Its much better to cut the 3.3V (to keep the CPLD alive longer) and CPU_RST (to prevent parasite signals/capacitance being sent to the CPU), this way the capacitor between CPU_RST-GND won't interfere with your CPU, cutting POST does nothing else but guaranteeing you that the CPLD wont glitch.

[smithisize]

Do you happen to have pic of the wiring? I'm kind of a noob when it comes to electrical. I can solder very well, but I don't always understand what I'm doing unfortunately :/

[Tiros]

Its much better to cut the 3.3V (to keep the CPLD alive longer) and CPU_RST (to prevent parasite signals/capacitance being sent to the CPU), this way the capacitor between CPU_RST-GND won't interfere with your CPU, cutting POST does nothing else but guaranteeing you that the CPLD wont glitch.

Bad advice.
Its never a good idea to have an unpowered device connected to active signals. Over time it can damge the cpld or the signal source itself.
Switching the post is actually a good idea. Its electrically safe and should stop the glitch. You dont want to leave the cpld post in floating when its switched off. To prevent it from toggling in that state, the xilinx can be configured to have a pull up on that pin, by modding the .ucf file. If your not comfortable with that, just use a switch to connect the cpld post in to either the post signal itself, or ground.

[oedi]

I have the same problem,installed the relay according to the picture above and the coolrunner isnt powered now,regardless of the switch position.
I wasnt able to find a pinout of the relay yet but it looks like there`s a ground wire missing...?

[fullban]

i would like to know this to ,iv just got 2 switches 1 4 coolrunner and 1 for cygnos