aha2940
AH, A, COLUMBIAN!,
- Joined
- Dec 15, 2013
- Posts
- 2,528
Hi
I am trying to burn an EPROM (ST M27C160) but it's consistently failing. I noticed that when I read a blank M27C160 EPROM on my reader, it always reads like this:
FFBF FFBF FFBF...
all filled with this pattern. Of course, when I write the EPROM, it writes fine, but it fails the verification. Funny thing is: the bits that fail the verification are not always the same that show wrong when the EPROM is empty. Sometimes they are, but sometimes they check fine.Things I have tried:
- Using a different version of the software (TOPWin 6 and TOPWin7, my programmer is a TOP3000)
- Using a different PC to connect the programmer. Same problem.
- Using different EPROM models: I tried reading empty D27C1001D, M27C4002, 27C010A, and D27C1000A, all read perfectly (all FFFF)
- Using different USB cable to connect the programmer. Problem persists.
I am at a loss here guys, any suggestions are welcome.
Thanks!!
I am trying to burn an EPROM (ST M27C160) but it's consistently failing. I noticed that when I read a blank M27C160 EPROM on my reader, it always reads like this:
FFBF FFBF FFBF...
all filled with this pattern. Of course, when I write the EPROM, it writes fine, but it fails the verification. Funny thing is: the bits that fail the verification are not always the same that show wrong when the EPROM is empty. Sometimes they are, but sometimes they check fine.Things I have tried:
- Using a different version of the software (TOPWin 6 and TOPWin7, my programmer is a TOP3000)
- Using a different PC to connect the programmer. Same problem.
- Using different EPROM models: I tried reading empty D27C1001D, M27C4002, 27C010A, and D27C1000A, all read perfectly (all FFFF)
- Using different USB cable to connect the programmer. Problem persists.
I am at a loss here guys, any suggestions are welcome.
Thanks!!