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M58WR064T Datasheet(PDF) 32 Page - STMicroelectronics |
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M58WR064T Datasheet(HTML) 32 Page - STMicroelectronics |
32 / 81 page ![]() M58WR064T, M58WR064B 32/81 Synchronous Single Reads are used to read the Electronic Signature, Status Register, CFI, Block Protection Status, Configuration Register Status or Protection Register. When the addressed bank is in Read CFI, Read Status Register or Read Electronic Signature mode, the WAIT signal is al- ways asserted. See Table 21, Synchronous Read AC Character- istics and Figure 13, Single Synchronous Read AC Waveform for details. DUAL OPERATIONS AND MULTIPLE BANK ARCHITECTURE The Multiple Bank Architecture of the M58WR064 provides flexibility for software developers by al- lowing code and data to be split with 4Mbit granu- larity. 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 pro- gramming or erasing in one bank, Read opera- tions 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 re- quired in a bank which is programming or erasing, the Program or Erase operation can be suspend- ed. Also if the suspended operation was Erase then a Program command can be issued to anoth- er block, so the device can have one block in Erase Suspend mode, one programming and oth- er banks in Read mode. Read Array commands 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. Tables 11 and 12 show the dual operations possi- ble in other banks and in the same bank. Note that only the commonly used commands are repre- sented in these tables. For a complete list of pos- sible commands refer to Appendix D, Command Interface State Tables. Table 11. Dual Operations Allowed In Other Banks Table 12. Dual Operations Allowed In Same Bank Note: 1. Not allowed in the Block or Word that is being erased or programmed. 2. The Read Array command is accepted but the data output is not guaranteed until the Program or Erase has completed. Status of bank Commands allowe d in another bank Read Array Read Status Register Read CFI Query Read Electronic Signature Program 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 Status of bank Commands allowed in same bank Read Array Read Status Register Read CFI Query Read Electronic Sign ature Program Erase Program/ Erase Suspend Program/ Erase Resume Idle Yes Yes Yes Yes Yes Yes Yes Yes Programming –(2) Yes Yes Yes – – Yes – Erasing –(2) Yes Yes Yes – – Yes – Program Suspended Yes(1) Yes Yes Yes – – – Yes Erase Suspended Yes(1) Yes Yes Yes Yes(1) –– Yes |
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