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M29W040-120NZ5R Datasheet(PDF) 7 Page - STMicroelectronics |
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M29W040-120NZ5R Datasheet(HTML) 7 Page - STMicroelectronics |
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7 / 31 page  64K Bytes Block AI01362B 7FFFFh 6FFFFh 5FFFFh 4FFFFh 3FFFFh 2FFFFh 1FFFFh 0FFFFh TOP ADDRESS 70000h 60000h 50000h 40000h 30000h 20000h 10000h 00000h BOTTOM ADDRESS A18 1 1 64K Bytes Block 64K Bytes Block 64K Bytes Block 64K Bytes Block A17 1 1 A16 1 0 1 1 0 0 1 0 0 0 1 1 1 0 00 1 00 0 Figure 3. Memory Map and Block Address Table Hex Code Command 10h Chip Erase Confirm 20h Power Down 30h Block Erase Resume/Confirm 50h Reserved 80h Set-up Erase 90h Read Electronic Signature/ Block Protection Status A0h Program B0h Erase Suspend F0h Read Array/Reset Table 7. Commands Block Protection. Each uniform block can be separately protected against Program or Erase. Block Protection provides additional data security, as it disables all program or erase operations. This mode is activated when both A9 and G are set to VID and the block address is applied on A16-A18. Block Protection is programmed using a Presto F program like algorithm. Protection is initiated on the edge of W falling to VIL. Then after a delayof 100 µs, the edge of W rising to VIH ends the protection operation. Protection verify is achieved by bringing G, E and A6 to VIL while W is at VIH and A9 at VID. Under these conditions, readingthe data output will yield 01h if the block defined by the inputs on A16-A18 is protected. Any attempt to program or erase a protected block will be ignored by the device. Any protected block can be unprotected to allow updating of bit contents. All blocks must be pro- tected before an unprotect operation. Block Un- protect is activated when A9, G and E are at VID. The addresses inputs A6, A12, A16 must be main- tained at VIH. Block Unprotect is performed through a Presto F Erase like algorithm. Unprotect is initi- ated by the edge of W falling to VIL. After a delay of 10ms, the edge of W rising to VIH will end the unprotection operation. Unprotect verify is achieved by bringing G and E to VIL while A6 and W are at VIH and A9 at VID. In these conditions, reading the output data will yield 00h if the block defined by the inputs on A16-A18 has been suc- cessfullyunprotected.All combinations of A16-A18 must be addressed in order to ensure that all of the 8 uniform blocks have been unprotected. Block Protection Status is shown in Table 5. 7/31 M29W040 |
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