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WME128K8-140CMA Datasheet(PDF) 9 Page - White Electronic Designs Corporation |
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WME128K8-140CMA Datasheet(HTML) 9 Page - White Electronic Designs Corporation |
9 / 11 page 9 White Electronic Designs Corporation • (602) 437-1520 • www.wedc.com White Electronic Designs WME128K8-XXX January 2004 Rev. 5 White Electronic Designs Corp. reserves the right to change products or specifications without notice. LOAD DATA AA TO ADDRESS 5555 LOAD DATA 55 TO ADDRESS 2AAA LOAD DATA 80 TO ADDRESS 5555 LOAD DATA AA TO ADDRESS 5555 LOAD DATA 55 TO ADDRESS 2AAA LOAD DATA 20 TO ADDRESS 5555 LOAD DATA XX TO ANY ADDRESS(4) LOAD LAST BYTE TO LAST ADDRESS NOTES: 1. Data Format: I/O7 - I/O0 (Hex); Address Format: A16 - A0 (Hex). 2. Write Protect state will be activated at end of write even if no other data is loaded. 3. Write Protect state will be deactivated at end of write period even if no other data is loaded. 4. 1 to 128 bytes of data may be loaded. FIGURE 9 – SOFTWARE BLOCK DATA PROTECTION DISABLE ALGORITHM(1) EXIT DATA PROTECT STATE(3) SOFTWARE DATA PROTECTION A software write protection feature may be enabled or disabled by the user. When shipped by White Microelectronics, the WME128K8-XXX has the feature disabled. Write access to the device is unrestricted. To enable software write protection, the user writes three access code bytes to three special internal locations. Once write protection has been enabled, each write to the EEPROM must use the same three byte write sequence to permit writing. After setting software Data protection, any attempt to write to the device without the three-byte command sequence will start the internal write timers. No Data will be written to the device; however, for the duration of tWC. The write protection feature can be disabled by a six byte write sequence of specific data to specific locations. Power transitions will not reset the software write protection. The software write protection guards against inadvertent writes during power transitions or unauthorized modification using a PROM programmer. HARDWARE DATA PROTECTION These features protect against inadvertent writes to the WME128K8-XXX. These are included to improve reliability during normal operation: a) VCC power on delay As VCC climbs past 3.8V typical the device will wait 5msec typical before allowing write cycles. b) VCC sense While below 3.8V typical write cycles are inhibited. c) Write inhibiting Holding OE# low and either CS# or WE# high inhibits write cycles. d) Noise filter Pulses of <15ns (typ) on WE# or CS# will not initiate a write cycle. |
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