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WE512K8-250CQA Datasheet(PDF) 8 Page - White Electronic Designs Corporation |
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WE512K8-250CQA Datasheet(HTML) 8 Page - White Electronic Designs Corporation |
8 / 13 page WE512K8, WE256K8, WE128K8-XCX 8 White Electronic Designs Corporation • (602) 437-1520 • www.wedc.com White Electronic Designs May 2000 Rev. 1 White Electronic Designs Corp. reserves the right to change products or specifications without notice. DATA POLLING Operation with data polling permits a faster method of writing to the EEPROM. The actual time to complete the memory programming cycle is faster than the guaranteed maximum. The EEPROM features a method to determine when the internal programming cycle is completed. After a write cycle is initiated, the EEPROM will respond to read cycles to provide the microprocessor with the status of the programming cycle. The status consists of the last data byte written being returned with data bit I/O7 complemented during the programming cycle, and I/O7 true after completion. Data polling allows a simple bit test operation to determine the status of the EEPROM. During the internal programming cycle, a read of the last byte written will produce the complement of the data on I/O7. For example, if the data written consisted of I/O7 = HIGH, then the data read back would consist of I/O7 = LOW. A polled byte write sequence would consist of the following steps: 1. write byte to EEPROM 2. store last byte and last address written 3. release a time slice to other tasks 4. read byte from EEPROM - last address 5. compare I/O7 to stored value a) If different, write cycle is not completed, go to step 3. b) If same, write cycle is completed, go to step 1 or step 3. DATA POLLING AC CHARACTERISTICS VCC = 5.0V, VSS = 0V, -55°C ≤ TA ≤ +125°C Parameter Symbol 512Kx8 256Kx8 128Kx8 Unit Min Max Min Max Min Max Data Hold Time tDH 10 0 0 ns Output Enable Hold Time tOEH 10 0 0 ns Output Enable To Output Delay tOE 100 100 100 ns Write Recovery Time tWR 000 ns FIGURE 8 – DATA POLLING WAVEFORMS OE# ADDRESS CS1-4# WE1-4# I/O7 |
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