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Altera_Forum's avatar
Altera_Forum
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16 years ago

nStatus can't go high

I have just finished my pcb of EP3C25F324, but it can't work when I power on the board, all user IO pins stayed high, the nSTATUS remaid low, and nCONFIG statyed high. Is't the problem of POR? Or ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

thanks for your help,I will try the Debug techniques later.

as the scheme of powet above, I connect the VCCIO of bank1 to the 3.3V,

I have doubt this, because the jtag pins and EPC pins are both in the bank1, but jtag is powered at 2.5V and EPC is powered at 3.3V.

I followed the Figure 10-30 on cyclone3 device handbook to design the config scheme(Programming Serial Configuration Devices In-System Using the JTAG Interface).

VCCIO of bank1: 3.3V

VCCIO of other banks: 2.5V

VCCINT:1.2V

VCCA: 2.5V

MSEL :0010 (1 to 2.5V)

(you can see the detailed connection via the scheme above, maybe it's not clear enough, you can save it to your local coputer and then enlarge it)