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M29DW323DT Datasheet(PDF) 22 Page - Numonyx B.V |
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M29DW323DT Datasheet(HTML) 22 Page - Numonyx B.V |
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22 / 51 page  M29DW323DT, M29DW323DB 22/51 DUAL OPERATIONS AND MULTIPLE BANK ARCHITECTURE The Multiple Bank Architecture of the M29DW323DT and M29DW323DB gives greater flexibility for software developers to split the code and data spaces within the memory array. The Dual Operations feature simplifies the software management of the device by allowing code to be executed from one bank while the other bank is being programmed or erased. The Dual Operations feature means that while pro- gramming or erasing in one bank, read operations are possible in the other bank with zero latency. Only one bank at a time is allowed to be in pro- gram or erase mode. If a read operation is required in a bank, which is programming or erasing, the program or erase op- eration 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. By using a combination of these features, read op- erations are possible at any moment. Table 9. and Table 10. show the dual operations possible in other banks and in the same bank. Note that only the commonly used commands are represented in these tables. Table 9. Dual Operations Allowed In the Other Bank Note: 1. If one bank is involved in a program or erase operation, then the other bank is available for dual operations. 2. Only after an Erase operation in that bank. 3. Only after an Erase Suspend command in that bank. Table 10. Dual Operations Allowed In Same Bank Note: 1. Not allowed in the Block or Word that is being erased or programmed. 2. Only after an Erase operation in that bank. 3. Only after an Erase Suspend command in that bank. 4. Read Status Register is not a command. The Status Register can be read during a block program or erase operation. 5. The Status Register can be read by addressing the block being erase suspended. Status of First Bank(1) Commands allowed in the Other Bank(1) Read Array Read Status Register(6) Read CFI Query Auto Select Program Erase Erase Suspend Erase Resume Idle Yes Yes(2) Yes Yes Yes Yes Yes(2) Yes(3) Programming Yes No No No – – No No Erasing Yes No No No – – No No Erase Suspended Yes Yes Yes Yes Yes No - Yes Status of bank Commands allowed in same bank Read Array Read Status Register(4) Read CFI Query Auto Select Program Erase Erase Suspend Erase Resume Idle Yes Yes Yes Yes Yes Yes Yes(2) Yes(3) Programming No Yes No No – – No - Erasing No Yes No No – No Yes(5) - Erase Suspended Yes(1) Yes(5) Yes Yes Yes(1) No - Yes(4) |
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