28C64 DATASHEET PDF

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Here is the serial output. Sign up or log in Sign up using Google. I’d recommend following that same sequence and also change your write sequence to follow the diagram on the following page. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

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28C64A-15 – 28C64A 64K 150ns Parallel EEPROM Technical Data

I am using the Xicor 28C64AP chip datasheet. Mar 26 ’13 at Thanks for the response, supercat. The device has 13 address pins, which should specify an address in binary from 0x to 0x1FFF.

PeterJ 16k 20 42 Mar 27 ’13 at When the timer expires, an internal write cycle is triggered and additional writes before it completes. Looking at the datasheet on page 12 it shows a timing diagram and Chip Enable Access Time can be up to darasheet.

Since I am only using the first three address pins, the rest are tied low. I wrote a program for the Arduino Uno that writes data to the first 4 addresses and then reads the data back.

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28C64 Datasheet PDF –

I have tied the top 10 address bits low and am only using the first 3 for now. That will make the remainder of your code much more readable. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

I understand the benefits of separating the code into subroutines and will probably do this, but for now I am just trying to get the byte write working.

All behave the same. 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 CE and OE.

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Thanks for the info. If it has, you’ll need to wire up all your address wires in order to disable it. You have not indicated that you are doing anything with them? One thing that is missing is on page 7 of the datasheet, it states that you need to write a sequence of codes to disable write-protection. I have edited my question. The timings for this particular EEPROM aren’t super-critical, but it has a timer which starts when the first byte is written and gets reset if another byte is written before it expires.

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That might help things. The chips are new, and I actually have two from two different manufacturers. Sign up using Facebook. Post as a guest Name.

I don’t really like the design, but my guess is that it was trying to be compatible with an earlier part where one could write locations one at a time and just wait after each one. Here is my code, sorry if it seems too cluttered:. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. I added ms delays between every control pin change and made sure the order was consistent with the datasheet, but still no luck.

Initializing pins for write BTW, if the chips are equipment pulls as opposed to new parts, it’s possible that the “software protection” feature has previously been enabled. Here is my code, sorry if it seems too cluttered: Any help would datashfet much appreciated. I have tested an earlier version of the above dagasheet with a static RAM chip and everything works great.

The same diagram shows CE being asserted followed by OE for a read cycle. Home Questions Tags Users Unanswered.

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