issue while Communicationg W3150A+ via 8bit bus

Question

Hello, I’m trying to Read/Write data from/to W3150A+, I’ve tried several ways to do so but no luck, whatever i put into Address pin, Data pins stays LOW signal while i give /RESET as HIGH /CS as LOW /RD as LOW /WR as HIGH i simply cannot access W3150A+ I haven’t tried SPI Communication

Eugeny · Answer

Two things come to my mind: chip is in SPI mode (pin 33 is high); you have problem with clock circuit- it does not function properly and chip is stuck.

Eugeny · Answer

Well, I can only guess as you do not provide any info for troubleshooting. Maybe you read locations really having zeroes in them? Maybe some other device also drives the data bus low?

toh · Answer

There’s Two W3150+ , which uses same data, address bus! ( different /CS pin ) though i surely made other one’s /CS pin as HIGH, or can i not use Two W3150+ ? about the read Location, i’m pretty sure i am reading it correctly, i checked it with oscilloscope…

Eugeny · Answer

toh: There’s Two W3150+ , which uses same data, address bus! ( different /CS pin ) And if you read another chip it also reads all zeros?

toh · Answer

Yes, it does. only zeros question, Does Address data comes first and Data READ or Write Enable? or READ/WRITE Enable comes first and Address data? i just changed it, ( Address Data set, and then READ Enable ) it does gives me data, yet i need to find out it’s legit

Eugeny · Answer

toh: Does Address data comes first and Data READ or Write Enable? or READ/WRITE Enable comes first and Address data? See chapter 7 of datasheet.

toh · Answer

Problem solved, Thanks you for your help

Eugeny · Answer

toh: Problem solved Please share what the solution is so that others find your solution for similar problems.

toh · Answer

It was Timing problem, I changed timing setting and it works fine! i also had Pin Output/input problem but it was about MCU