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Looking at the datasheet on page 12 it shows a timing diagram and Chip Enable Access Time can be up to nS. The chips are new, and I actually have two from two different manufacturers.
I understand the benefits of separating the code into subroutines and will probably vatasheet this, but for now I am just trying to get the byte write working. Sign up using Facebook. All behave the same.
28C64A-15 – 28C64A 64K 150ns Parallel EEPROM Technical Data
I’d recommend following that same sequence and also change your datashet sequence to follow the diagram on the following page.
28C64A Technical Data
I have tested an earlier version of the above program with a static RAM chip and everything works great. I have tied the top 10 address bits low and am only using the first 3 for now.
I added ms delays between every control pin change and made sure the order was consistent with the datasheet, but still no luck. The timings for this particular EEPROM aren’t super-critical, but it has a timer which starts when the first dxtasheet is written and gets reset if another byte is written before it expires.
When the timer expires, an internal write cycle is triggered and additional writes before it completes. I wrote a program for the Arduino Uno that writes data to the first 4 addresses and then reads the data back. Thanks for the info. You have not indicated that you are doing anything with them?
Thanks for the response, supercat. Mar 26 ’13 at The same diagram shows CE being asserted followed by OE for a read cycle. Also, I would suggest that you should write a writebyte procedure which sets all address and data wires to output and puts proper values on them, ensures WE and OE are deasserted, asserts CE, asserts and release WE, and releases CE, and a readbyte procedure which sets all address wires to output and puts proper values on them, sets all data wires to input, asserts CE and OE, samples all the data wires, and releases Datssheet and OE.
Email Required, but never shown. Since I am only using the first three address pins, the datashset are tied low. That might help things. If it has, you’ll need to wire up all your address wires in order to disable it. I have edited my question.
PeterJ 16k 20 42 Any help would be much appreciated. That will make the remainder of your code much more readable. I am using the Xicor 28C64AP chip datasheet. The device has 13 address pins, dahasheet should specify an address in binary from 0x to 0x1FFF.
Mar 27 ’13 at Home Questions Tags Users Unanswered. Initializing pins for write Sign up using Email and Password. Sign up or log in Sign up datasheeh Google.