NIKL, i' m using GPIF Master mode. CY7C68013A coonected with that microchip: http://www.holtic.com/products/2992-hi-3582a-hi-3583a.aspx via data bus. The problem is when data set up i can't see enough voltage level on data bus (it's about 1 V). And i'm using GPIF Designer utility to create GPIF waveform.
The link that you gave talks about 37.5 ohm series output impedance. The voltage levels specified in the datasheet are at 4mA current drive
1. Please check the current being driven by FX2LP
2. The link you gave talks about ARINC 429 serial bus and impedance matching to 37.5 ohms. Please clarify on this. Looks like the chip is assuming it is talking to a ARINC 429 device and expecting a 37.5 ohm resistance line. Which is not the case with FX2LP output.
The values in the datasheet for Voh for an Iout of 4mA is 2.4V.
FX2LP should be able to drive inputs comfortably assuming the input impedance isn't very low. That is the reason I'm asking you to measure the current being driven by FX2LP.
Problem solved. In my case just CY7C68013A write data and the same time microchip try to read this data. So there is low active level. Thanks for helping.