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M29DW640F90N6E Datasheet(PDF) 18 Page - Numonyx B.V |
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M29DW640F90N6E Datasheet(HTML) 18 Page - Numonyx B.V |
18 / 74 page Bus operations M29DW640F 18/74 3.5 Automatic Standby If CMOS levels (VCC ± 0.2V) are used to drive the bus and the bus is inactive for 300ns or more the memory enters Automatic Standby where the internal Supply Current is reduced to the Standby Supply Current, ICC2. The Data Inputs/Outputs will still output data if a Bus Read operation is in progress. 3.6 Special bus operations Additional bus operations can be performed to read the Electronic Signature and also to apply and remove Block Protection. These bus operations are intended for use by programming equipment and are not usually used in applications. They require VID to be applied to some pins. 3.6.1 Electronic Signature The memory has two codes, the manufacturer code and the device code, that can be read to identify the memory. These codes can be read by applying the signals listed in Table 4 and Table 5, Bus operations. 3.6.2 Block Protect and Chip Unprotect Groups of blocks can be protected against accidental Program or Erase. The Protection Groups are shown in Appendix A, Table 24: Block addresses The whole chip can be unprotected to allow the data inside the blocks to be changed. The VPP/Write Protect pin can be used to protect the four outermost boot blocks. When VPP/Write Protect is at VIL the four outermost boot blocks are protected and remain protected regardless of the Block Protection Status or the Reset/Block Temporary Unprotect pin status. Block Protect and Chip Unprotect operations are described in Appendix D. |
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