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M58WR064HT Datasheet(PDF) 49 Page - Numonyx B.V |
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M58WR064HT Datasheet(HTML) 49 Page - Numonyx B.V |
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49 / 111 page  M58WR064HT, M58WR064HB Dual operations and multiple bank architecture 49/111 10 Dual operations and multiple bank architecture The Multiple Bank Architecture of the M58WR064HT/B provides flexibility for software developers by allowing code and data to be split with 4Mbit granularity. The Dual Operations feature simplifies the software management of the device and allows code to be executed from one bank while another bank is being programmed or erased. The Dual operations feature means that while programming or erasing in one bank, Read operations are possible in another bank with zero latency (only one bank at a time is allowed to be in Program or Erase mode). If a Read operation is required in a bank which is programming or erasing, the Program or Erase operation can be suspended. Also if the suspended operation was Erase then a Program command can be issued to another block, so the device can have one block in Erase Suspend mode, one programming and other banks in Read mode. Bus Read operations are allowed in another bank between setup and confirm cycles of program or erase operations. The combination of these features means that read operations are possible at any moment. Dual operations between the Parameter Bank and either the CFI, OTP or the Electronic Signature memory space are not allowed. Table 14 however shows dual operations, which are allowed between the CFI, OTP, Electronic Signature locations and the memory array. Tables 12 and 13 show the dual operations possible in other banks and in the same bank. For a complete list of possible commands refer to Appendix D: Command interface state tables. Table 12. Dual Operations Allowed In Other Banks Status of bank Commands allowed in another bank Read Array Read Status Register Read CFI Query Read Electronic Signature Program Block Erase Program/ Erase Suspend Program/ Erase Resume Idle Yes Yes Yes Yes Yes Yes Yes Yes Programming Yes Yes Yes Yes – – Yes – Erasing Yes Yes Yes Yes – – Yes – Program Suspended Yes Yes Yes Yes – – – Yes Erase Suspended Yes Yes Yes Yes Yes – – Yes |
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