All Forums  MCUmall Forums  True USB Willem Programmer (GQ-2X,3X,4X & GQ-4x4)  Cypress CY27C128 reading 00's not FF's when blank

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Screensize: 640 x 480 800 x 600 1024 x 768 1280 x 1024 UserName: Password: Format Mode: Basic  Help  Prompt  Format: Font Andale Mono Arial Arial Black Book Antiqua Century Gothic Comic Sans MS Courier New Georgia Impact Lucida Console Script MT Bold Stencil Tahoma Times New Roman Trebuchet MS Verdana   Size 1 2 3 4 5 6   Color Black Red Yellow Pink Green Orange Purple Blue Beige Brown Teal Navy Maroon LimeGreen Message: * HTML is OFF * Forum Code is ON Smilies [quote][i]Originally posted by zeusthedog[/i] [br]Hi Guys, I have an issue blank verifying and therefore writing to a Cypress EPROM CY27C128. After UV erasure, the EPROM reads as all 00's, not all FF's. I have read that this is a "normal" function of the Cypress chip, something to do with a high speed feature built into the chip design, that means when blank the chip reads as all 00's. My question is; How do I get the GQ-4X software to verify the chip as blank when it reads all 00's and allow me to then perform a subsequent write? Or is this not possible with this programmer/software, thus it is not compatible with the CY27C128 chip series (or probably any Cypress EPROM). I have successfully written an M27C256B (ST brand) with the programmer, so I know the programmer is OK. As an aside, I had to rewrite the Device parameters for the M27C256B to get it to write successfully, as the default device parameters had the incorrect speed setting and write Vpp voltage. If anyone needs the correct parameters for this chip or needs to know how to adjust them in the software, just ask and I'd be happy to help. Thanks guys! [/quote]    Insert an Image File Check here to include your profile signature.