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M28W320FCT Datasheet(PDF) 14 Page - Numonyx B.V |
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M28W320FCT Datasheet(HTML) 14 Page - Numonyx B.V |
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14 / 69 page  Bus operations M28W320FCT, M28W320FCB 14/69 3 Bus operations There are six standard bus operations that control the device. These are Bus Read, Bus Write, Output Disable, Standby, Automatic Standby and Reset. See Table 2: Bus Operations, for a summary. Typically glitches of less than 5ns on Chip Enable or Write Enable are ignored by the memory and do not affect bus operations. 3.1 Read Read Bus operations are used to output the contents of the Memory Array, the Electronic Signature, the Status Register and the Common Flash Interface. Both Chip Enable and Output Enable must be at VIL in order to perform a read operation. The Chip Enable input should be used to enable the device. Output Enable should be used to gate data onto the output. The data read depends on the previous command written to the memory (see Command Interface section). See Figure 8: Read AC Waveforms, and Table 16: Read AC Characteristics, for details of when the output becomes valid. Read mode is the default state of the device when exiting Reset or after power-up. 3.2 Write Bus Write operations write Commands to the memory or latch Input Data to be programmed. A write operation is initiated when Chip Enable and Write Enable are at VIL with Output Enable at VIH. Commands, Input Data and Addresses are latched on the rising edge of Write Enable or Chip Enable, whichever occurs first. See Figure 9 and Figure 10, Write AC Waveforms, and Table 17 and Table 18, Write AC Characteristics, for details of the timing requirements. 3.3 Output Disable The data outputs are high impedance when the Output Enable is at VIH. 3.4 Standby Standby disables most of the internal circuitry allowing a substantial reduction of the current consumption. The memory is in stand-by when Chip Enable is at VIH and the device is in read mode. The power consumption is reduced to the stand-by level and the outputs are set to high impedance, independently from the Output Enable or Write Enable inputs. If Chip Enable switches to VIH during a program or erase operation, the device enters Standby mode when finished. |
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