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AT45DB321E датащи(PDF) 44 Page - Dialog Semiconductor |
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AT45DB321E датащи(HTML) 44 Page - Dialog Semiconductor |
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44 / 70 page ![]() 43 AT45DB321E 8784L–DFLASH–3/2019 Note: P = Page Address Bit B = Byte/Buffer Address Bit X = Dummy Bit 15. Power-On/Reset State When power is first applied to the device, or when recovering from a reset condition, the device will default to SPI Mode 3. In addition, the output pin (SO) will be in a high impedance state, and a high-to-low transition on the CS pin will be required to start a valid instruction. The SPI mode (Mode 3 or Mode 0) will be automatically selected on every falling edge of CS by sampling the inactive clock state. 15.1 Initial Power-Up Timing Restrictions As the device initializes, there will be a transient current demand. The system needs to be capable of providing this current to ensure correct initialization. During power-up, the device must not be accessed for at least the minimum t VCSL time after the supply voltage reaches the minimum VCC level. While the device is being powered-up, the internal Power- On Reset (POR) circuitry keeps the device in a reset mode until the supply voltage rises above the maximum POR threshold value (V POR). During this time, all operations are disabled and the device will not respond to any commands. After power-up, the device will be in the standby mode. If the first operation to the device after power-up will be a program or erase operation, then the operation cannot be started until the supply voltage reaches the minimum V CC level and an internal device delay has elapsed. This delay will be a maximum time of t PUW. Table 15-1. Power-Up Timing D1h 1 1 0 1 0 0 0 1 X X X X X X X X X X X X X X B B B B B B B B B B N/A D2h 1 1 0 1 0 0 1 0 X P P P P P P P P P P P P P B B B B B B B B B B 4 D3h 1 1 0 1 0 0 0 1 X X X X X X X X X X X X X X B B B B B B B B B B N/A D4h 1 1 0 1 0 1 0 0 X X X X X X X X X X X X X X B B B B B B B B B B 1 D6h 1 1 0 1 0 1 1 0 X X X X X X X X X X X X X X B B B B B B B B B B 1 D7h 1 1 0 1 0 1 1 1 N/A N/A N/A N/A 1. Shown to indicate when Auto Page Rewrite Operation is executed. 2. Shown to indicate when Read Modify Write Operation is executed. Page Size = 528-bytes Address Byte Address Byte Address Byte Additional Dummy Bytes Opcode Opcode Symbol Parameter Min Max Units t VCSL Minimum V CC to Chip Select Low Time 105 µs tPUW Power-Up Device Delay Before Program or Erase Allowed 3 ms V POR Power-On Reset (POR) Voltage 1.5 2.2 V |
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