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SST34HF3282-70-4E-L1PE Datasheet(PDF) 4 Page - Silicon Storage Technology, Inc |
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SST34HF3282-70-4E-L1PE Datasheet(HTML) 4 Page - Silicon Storage Technology, Inc |
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4 / 41 page  4 Data Sheet 32 Mbit Concurrent SuperFlash + 4/8 Mbit PSRAM ComboMemory SST34HF3244 / SST34HF3282 / SST34HF3284 ©2006 Silicon Storage Technology, Inc. S71335-00-000 8/06 Flash Write Operation Status Detection The SST34HF32xx provide one hardware and two soft- ware means to detect the completion of a Write (Program or Erase) cycle, in order to optimize the system Write cycle time. The hardware detection uses the Ready/ Busy# (RY/BY#) pin. The software detection includes two status bits: Data# Polling (DQ7) and Toggle Bit (DQ6). The End-of-Write detection mode is enabled after the ris- ing edge of WE#, which initiates the internal Program or Erase operation. The actual completion of the nonvolatile write is asynchro- nous with the system; therefore, either a Ready/Busy# (RY/ BY#), Data# Polling (DQ7) or Toggle Bit (DQ6) read may be simultaneous with the completion of the Write cycle. If this occurs, the system may possibly get an erroneous result, i.e., valid data may appear to conflict with either DQ7 or DQ6. In order to prevent spurious rejection, if an erroneous result occurs, the software routine should include a loop to read the accessed location an additional two (2) times. If both reads are valid, then the device has completed the Write cycle, otherwise the rejection is valid. Ready/Busy# (RY/BY#) The SST34HF32xx include a Ready/Busy# (RY/BY#) out- put signal. RY/BY# is an open drain output pin that indi- cates whether an Erase or Program operation is in progress. Since RY/BY# is an open drain output, it allows several devices to be tied in parallel to VDD via an external pull-up resistor. After the rising edge of the final WE# pulse in the command sequence, the RY/BY# status is valid. When RY/BY# is actively pulled low, it indicates that an Erase or Program operation is in progress. When RY/BY# is high (Ready), the devices may be read or left in standby mode. Byte/Word (CIOF) The device includes a CIOF pin to control whether the device data I/O pins operate x8 or x16. If the CIOF pin is at logic “1” (VIH) the device is in x16 data configuration: all data I/0 pins DQ0-DQ15 are active and controlled by BEF# and OE#. If the CIOF pin is at logic “0”, the device is in x8 data config- uration: only data I/O pins DQ0-DQ7 are active and con- trolled by BEF# and OE#. The remaining data pins DQ8- DQ14 are at Hi-Z, while pin DQ15 is used as the address input A-1 for the Least Significant Bit of the address bus. Flash Data# Polling (DQ7) When the devices are in an internal Program operation, any attempt to read DQ7 will produce the complement of the true data. Once the Program operation is completed, DQ7 will produce true data. During internal Erase operation, any attempt to read DQ7 will produce a ‘0’. Once the internal Erase operation is completed, DQ7 will produce a ‘1’. The Data# Polling is valid after the rising edge of fourth WE# (or BEF#) pulse for Program operation. For Sector-, Block-, or Chip-Erase, the Data# Polling is valid after the rising edge of sixth WE# (or BEF#) pulse. See Figure 10 for Data# Poll- ing (DQ7) timing diagram and Figure 23 for a flowchart. |
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