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PF38F5070M0R0B 数据表(PDF) 81 Page - Numonyx B.V

部件名 PF38F5070M0R0B
功能描述  Numonyx Wireless Flash Memory (W18)
Download  102 Pages
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制造商  NUMONYX [Numonyx B.V]
网页  http://www.numonyx.com
标志 NUMONYX - Numonyx B.V

PF38F5070M0R0B 数据表(HTML) 81 Page - Numonyx B.V

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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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