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EM39LV040 Datasheet(PDF) 7 Page - ELAN Microelectronics Corp |
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EM39LV040 Datasheet(HTML) 7 Page - ELAN Microelectronics Corp |
7 / 21 page EM39LV040 4M (512Kx8) Bits Flash Memory SPECIFICATION Hardware Data Protection Noise/Glitch Protection: A WE# or CE# pulse of less than 5 ns will not initiate a write cycle. VDD Power Up/Down Detection: The Write operation is inhibited when VDD is less than 1.5V. Write Inhibit Mode: Forcing OE# Low, CE# High, or WE# High will inhibit the Write operation. This prevents inadvertent write during power-up or power-down. Software Data Protection (SDP) The EM39LV040 provides the JEDEC approved Software Data Protection (SDP) scheme for Program and Erase operations. Any Program operation requires the inclusion of the three-byte sequence. The three-byte load sequence is used to initiate the Program operation, providing optimal protection from inadvertent Write operations, especially during the system power-up or power-down transition. Any Erase operation requires the inclusion of six-byte sequence. See Table 3 below for the specific software command codes. During SDP command sequence, invalid commands will abort the device to Read mode within TRC. Software Command Sequence 1st Bus Write Cycle 2nd Bus Write Cycle 3rd Bus Write Cycle 4th Bus Write Cycle 5th Bus Write Cycle 6th Bus Write Cycle Command Sequence Addr 1 Data Addr 1 Data Addr 1 Data Addr 1 Data Addr 1 Data Addr 1 Data Byte Program 5555H AAH 2AAAH 55H 5555H A0H BA 2 Data Sector Erase 5555H AAH 2AAAH 55H 5555H 80H 5555H AAH 2AAAH 55H SAX 3 30H Chip Erase 5555H AAH 2AAAH 55H 5555H 80H 5555H AAH 2AAAH 55H 5555H 10H Software ID Entry 4 5555H AAH 2AAAH 55H 5555H 90H Manufacture ID 5555H AAH 2AAAH 55H 5555H 90H 0000H 7FH Manufacture ID 5555H AAH 2AAAH 55H 5555H 90H 0003H 7FH Manufacture ID 5555H AAH 2AAAH 55H 5555H 90H 0040H 1FH Device ID 5555H AAH 2AAAH 55H 5555H 90H 0001H 29FH Software ID Exit 5 XXH F0H Software ID Exit 5 5555H AAH 2AAAH 55H 5555H F0H Notes: 1. Address format A18-A0 (Hex) & Address A16 can be VIL or VIH, (but no other value) for the Command sequence. 2. BA = Program byte address. 3. SAX for Sector-Erase; uses A19-A12 address lines. 4. The device does not remain in Software Product ID mode if powered down (see Figure 9 for more information). 5. Both Software ID Exit operations are equivalent. Table 3: Software Command Sequence This specification is subject to change without further notice. (07.22.2004 V1.0) Page 7 of 21 |
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