Hi there, here I have the following problem- I want to use a M29W640 flash memory (64MBit 16bit wide memory) in an SA1 cart. To achieve that, I used a GTL2000 and designed a small adapter board for that. Unfortunately it doesn't work... I tried to check the connections and everything seemed fine. I also did a little test- I connected one of the addresses (A0) to GND and to 5V after that and it behaves in a strange way- while I connected one of the GTL2000 inputs to GND, the corresponding output gave something around 0.80V-1.80V and it changed all the time and when I connected the input to 5V, the output voltage was something like 2.0V-2.5V and it changed as well. The voltage on the board was 5.0V and it was stable and the voltage regulator gave 3.28V and it was stable as well. Here's the schematic of the connections on my board:
Datasheet: http://www.nxp.com/documents/data_sheet/GTL2000.pdf
Is there anything wrong?? Maybe the pullup resistor is too high or low?? Is there anything else that might be wrong??
Also, I've found this chip in my drawer as well: SN74TVC16222A. Will that work better instead?? Please for reply. Any kind of help or advices will be strongly appreciated. Many thanks in advance!!
Datasheet: http://www.nxp.com/documents/data_sheet/GTL2000.pdf
Is there anything wrong?? Maybe the pullup resistor is too high or low?? Is there anything else that might be wrong??
Also, I've found this chip in my drawer as well: SN74TVC16222A. Will that work better instead?? Please for reply. Any kind of help or advices will be strongly appreciated. Many thanks in advance!!