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WE32K32N-90H1C Datasheet(PDF) 10 Page - White Electronic Designs Corporation |
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WE32K32N-90H1C Datasheet(HTML) 10 Page - White Electronic Designs Corporation |
10 / 13 page 10 White Electronic Designs Corporation • (602) 437-1520 • www.wedc.com White Electronic Designs WE32K32-XXX March 2006 Rev. 4 White Electronic Designs Corp. reserves the right to change products or specifications without notice. SOFTWARE DATA PROTECTION A software write protection feature may be enabled or disabled by the user. When shipped by White Microelectronics, the WE32K32-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. Each 32KByte block of the EEPROM has independent write protection. One or more blocks may be enabled and the rest disabled in any combination. 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 WE32K32-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 <8ns (typ) on WE# or CS# will not initiate a write cycle. 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 FIGURE 10 – SOFTWARE BLOCK DATA PROTECTION DISABLE ALGORITHM(1) NOTES: 1. Data Format: I/O15-0 (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 64 bytes of data may loaded. EXIT DATA PROTECT STATE(3) |
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