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How to program EPM240 externally, not in-system

MJaco2
Beginner
1,240 Views

I want to make a simple programmer for EPM240 (to be placed in a ZIF socket), use USB Blaster and program it from Quartus. What am I to do with the I/O pins during programming since they are not connected anywhere? Leave them floating?

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3 Replies
Nooraini_Y_Intel
Employee
135 Views

Hi MJaco2,

 

The EPM240(MAX II) devices only support JTAG protocol for programming the device which is In-System Programming (ISP). You can only use the Quartus programmer with the USB Blaster cable to program the MAX II device via the JTAG pins only. By default, all MAX II I/O pins are tri-stated during in-system programming. The MAX II device provides a weak pull-up resistor during ISP.

 

Regards,

Nooraini

 

a_x_h_75
New Contributor III
135 Views

You can leave the I/O floating. Providing you've powered all the power pins it is perfectly possible to program the device in your 'simple programmer' via JTAG. You can quite easily use third party JTAG hardware/software to program these devices as well, common practice in JTAG capable CEMs.

 

Cheers,

Alex

MJaco2
Beginner
135 Views

Thank you all. I couldn't find this info in any documentation. Apparently the common thing is to program the devices in situ but that doesn't work in miniature products where there is no room for the JTAG 8-pin header.

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