PF38F5070M0P0B NUMONYX [Numonyx B.V], PF38F5070M0P0B Datasheet - Page 82
PF38F5070M0P0B
Manufacturer Part Number
PF38F5070M0P0B
Description
Numonyx Wireless Flash Memory (W18)
Manufacturer
NUMONYX [Numonyx B.V]
Datasheet
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Table 34: WAIT Signal Conditions
14.5
Datasheet
82
CE# = V
CE# = V
OE#
Synchronous Array Read
Synchronous Non-Array Read
All Asynchronous Read and all Write
IH
IL
Data Hold (RCR[9])
The Data Output Configuration (DOC) bit (RCR[9]) determines whether a data word
remains valid on the data bus for one or two clock cycles. The processor’s minimum
data set-up time and the flash memory’s clock-to-data output delay determine whether
one or two clocks are needed.
A DOC set at 1-clock data hold corresponds to a 1-clock data cycle; a DOC set at 2-
clock data hold corresponds to a 2-clock data cycle. The setting of this configuration bit
depends on the system and CPU characteristics. For clarification, see
Output Configuration with WAIT Signal Delay” on page
A method for determining this configuration setting is shown below.
To set the device at 1-clock data hold for subsequent reads, the following condition
must be satisfied:
As an example, use a clock frequency of 66 MHz and a clock period of 15 ns. Assume
the data output hold time is one clock. Apply this data to the formula above for the
subsequent reads:
This equation is satisfied, and data output will be available and valid at every clock
period. If t
During page-mode reads, the initial access time can be determined by the formula:
Subsequent reads in page mode are defined by:
CONDITION
DATA is long, hold for two cycles.
t
11 ns + 4 ns ≤ 15 ns
t
t
CHQV (ns) +
ADD-DELAY (ns) +
APA (ns) +
t
DATA
t
DATA
(ns)
t
(ns) ≤ One CLK Period (ns)
DATA
(ns)
(minimum time)
+
Tri-State
Active
No-Effect
Active
Asserted
Asserted
t
AVQV
(ns)
Numonyx™ Wireless Flash Memory (W18)
Numonyx™ Wireless Flash Memory (W18)
83.
WAIT
Order Number: 290701-18
Figure 39, “Data
November 2007
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