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PF38F5070M0R0B 数据表(PDF) 81 Page - Numonyx B.V |
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PF38F5070M0R0B 数据表(HTML) 81 Page - Numonyx B.V |
81 / 102 page November 2007 Datasheet Order Number: 290701-18 81 Numonyx™ Wireless Flash Memory (W18) 14.3 WAIT Signal Polarity (RCR[10]) If the WAIT bit is cleared (RCR[10]=0), then WAIT is configured to be asserted low. This means that a 0 on the WAIT signal indicates that data is not ready and the data bus contains invalid data. Conversely, if RCR[10] is set, then WAIT is asserted high. In either case, if WAIT is deasserted, then data is ready and valid. WAIT is asserted during asynchronous page mode reads. 14.4 WAIT Signal Function The WAIT signal indicates data valid when the device is operating in synchronous mode (RCR[15]=0), and when addressing a partition that is currently in read-array mode. The WAIT signal is only “deasserted” when data is valid on the bus. When the device is operating in synchronous non-read-array mode, such as read status, read ID, or read query, WAIT is set to an “asserted” state as determined by RCR[10]. See Figure 12, “WAIT Signal in Synchronous Non-Read Array Operation Waveform” on page 35. When the device is operating in asynchronous page mode or asynchronous single word read mode, WAIT is set to an “asserted” state as determined by RCR[10]. See Figure 8, “Page-Mode Read Operation Waveform” on page 31, and Figure 6, “Asynchronous Read Operation Waveform” on page 29. From a system perspective, the WAIT signal is in the asserted state (based on RCR[10]) when the device is operating in synchronous non-read-array mode (such as Read ID, Read Query, or Read Status), or if the device is operating in asynchronous mode (RCR[15]=1). In these cases, the system software should ignore (mask) the WAIT signal, because it does not convey any useful information about the validity of what is appearing on the data bus. Figure 38: Example: Latency Count Setting at 3 A MAX-0 (A) DQ 15-0 (D/Q) CLK (C) CE# (E) ADV# (V) R103 Valid Output Valid Output High Z t ADD-DELAY t DATA 1nd 0st 2rd 3th 4th Valid Address Code 3 |
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类似说明 - PF38F5070M0R0B |
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