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Altera_Forum's avatar
Altera_Forum
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14 years ago

Could some one explain some thing in this schematic please :)

Im very new to FPGA's and am using this attached schematic to crib from. every thing makes sense apart from the following FPGA pins pins 26,81 held high to 1.2v pins 27,80 held to ground ...
Altera_Forum's avatar
Altera_Forum
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14 years ago

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had a quick read of the FT2232 datasheet and they suggest the 93LC46B thats the reason i picked it.

"There are two varieties of 93C46/56/66 EEPROM‟s on the market – one is configured as being 16 bits wide, the other is configured as being 8 bits wide. These are available from many sources such as Microchip, STMicro, ISSI etc. The"

just checked the datasheet

http://uk.rs-online.com/web/p/eeprom/0454246/

it can be run at 5v unless i have miss read it?

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That is correct, but you should be powering the 93LC46B at 5V, not 3.3V. Look at your schematic, both VCC and the pullup are currently to 3.3V.

Cheers,

Dave