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M58WR016QT Datasheet(PDF) 17 Page - Numonyx B.V |
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M58WR016QT Datasheet(HTML) 17 Page - Numonyx B.V |
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17 / 110 page  M58WR016QT, M58WR016QB, M58WR032QT, M58WR032QB Bus operations 17/110 3 Bus operations There are six standard bus operations that control the device. These are Bus Read, Bus Write, Address Latch, Output Disable, Standby and Reset. See Table 4: 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 Write operations. 3.1 Bus Read Bus Read 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 Figures 10, 11, 12 and 13 Read AC Waveforms, and Tables 21 and 22 Read AC Characteristics, for details of when the output becomes valid. 3.2 Bus Write Bus Write operations write Commands to the memory or latch Input Data to be programmed. A bus 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. The addresses can also be latched prior to the write operation by toggling Latch Enable. In this case the Latch Enable should be tied to VIH during the bus write operation. See Figures 16 and 17, Write AC Waveforms, and Tables 23 and 24, Write AC Characteristics, for details of the timing requirements. 3.3 Address Latch Address latch operations input valid addresses. Both Chip enable and Latch Enable must be at VIL during address latch operations. The addresses are latched on the rising edge of Latch Enable. 3.4 Output Disable The outputs are high impedance when the Output Enable is at VIH. |
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