There is a reasonable amount of room here. its choosing the right chip. One that will not end up EOL next week is what is concerning me,.juz400 wrote: ↑Wed Oct 14, 2020 9:50 am Is there space for buffering the H and V Sync signals like the Active 23wD to VGA adaptor has?
Have one of those adaptors but it puts a fair bit of weight on the Riser, with the adaptor and a chunky VGA cable it moves the top away from the CD32
making it a bit flakey in operation.
TF CD32 Riser Revision 2 Design Complete
Moderators: terriblefire, Terriblefire Moderator
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Re: TF CD32 Riser Revision 2 Design Complete
———
"It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that
indicates how much hurting you shall receive."
"It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that
indicates how much hurting you shall receive."
Re: TF CD32 Riser Revision 2 Design Complete
I built one in the 90`s for a mate so he could use an NEC mutlisync on his A4000, IIRC we need a schmitt trigger inverter?
These are brand spanky new from On-Semi, pretty cheap too or should I look for a Dual model?
https://www.mouser.co.uk/ProductDetail/ ... 52B7cs0%3D
These are brand spanky new from On-Semi, pretty cheap too or should I look for a Dual model?
https://www.mouser.co.uk/ProductDetail/ ... 52B7cs0%3D
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Re: TF CD32 Riser Revision 2 Design Complete
You dont want to invert the signal if you simply want to use the D23 as many of us do.juz400 wrote: ↑Wed Oct 14, 2020 10:15 am I built one in the 90`s for a mate so he could use an NEC mutlisync on his A4000, IIRC we need a schmitt trigger inverter?
These are brand spanky new from On-Semi, pretty cheap too or should I look for a Dual model?
https://www.mouser.co.uk/ProductDetail/ ... 52B7cs0%3D
———
"It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that
indicates how much hurting you shall receive."
"It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that
indicates how much hurting you shall receive."
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Re: TF CD32 Riser Revision 2 Design Complete
@arkadiusz.makarenko I have pushed all the changes to the branch. It includes a video buffer chip. Just needs checked over and we're good.
EDIT: What did you change the HSE XTal for ?
EDIT: What did you change the HSE XTal for ?
———
"It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that
indicates how much hurting you shall receive."
"It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that
indicates how much hurting you shall receive."
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Re: TF CD32 Riser Revision 2 Design Complete
The same type, but 25Mhz.terriblefire wrote: ↑Wed Oct 14, 2020 6:08 pm @arkadiusz.makarenko I have pushed all the changes to the branch. It includes a video buffer chip. Just needs checked over and we're good.
Capture.PNG
EDIT: What did you change the HSE XTal for ?
This allows me to set up all clocks, including 48Mhz for USB. I am not sure if it will be 100% stable, as my stm32 Nucleo board was a little temperamental running 216Mhz saying that this board is very solid.
I had a look and initially I was a little bit worried about dropping number INTSIG, but then I realised that SPI lines can be used if those will not be in use.
LSI crystal footprint was little bit unusual as I always seen them in different cylindrical package ... I guess I spend too much time with cheap Chinese knockoffs
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Re: TF CD32 Riser Revision 2 Design Complete
OK i'll use 25Mhz for the build.arkadiusz.makarenko wrote: ↑Wed Oct 14, 2020 9:04 pm The same type, but 25Mhz.
This allows me to set up all clocks, including 48Mhz for USB. I am not sure if it will be 100% stable, as my stm32 Nucleo board was a little temperamental running 216Mhz saying that this board is very solid.
I've not removed any INTSIG lines.. instead i removed TXD/RXD from the ARM (that is the direct connection to the CD32 internal UART) and moved R/W, INTSIG8 and KB_DATA. DSACK0 has been dropped and A5 added. So things have moved but have not been lost.I had a look and initially I was a little bit worried about dropping number INTSIG, but then I realised that SPI lines can be used if those will not be in use.
That may change but its the same package as the other one.LSI crystal footprint was little bit unusual as I always seen them in different cylindrical package ... I guess I spend too much time with cheap Chinese knockoffs
I think i'll order 5 assembled if you think this will work.
EDIT: updated the 32.Khz crystal footprint too.
———
"It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that
indicates how much hurting you shall receive."
"It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that
indicates how much hurting you shall receive."
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Re: TF CD32 Riser Revision 2 Design Complete
5 ordered..
———
"It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that
indicates how much hurting you shall receive."
"It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that
indicates how much hurting you shall receive."
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Re: TF CD32 Riser Revision 2 Design Complete
Wow, This went quickly!
Do not trust people. They are capable of greatness.
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Re: TF CD32 Riser Revision 2 Design Complete
Can I buy one for my self if is possible ?
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Re: TF CD32 Riser Revision 2 Design Complete
If it works you can get one of the 5 from me. I may send an extra to Arek and ask him to assemble for me as currently I have no solder station.
———
"It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that
indicates how much hurting you shall receive."
"It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that
indicates how much hurting you shall receive."