WME128K8 データシートの表示（PDF） - Microsemi Corporation
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WME128K8 Datasheet PDF : 12 Pages
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WME128K8-XXX
DATA POLLING
The WME128K8-XXX offers a data polling feature which allows a
faster method of writing to the device. Figure 6 shows the timing
diagram for this function. During a byte or page write cycle, an
attempted read of the last byte written will result in the complement
of the written data on I/O7. Once the write cycle has been
completed, true data is valid on all outputs and the next cycle may
begin. Data polling may begin at any time during the write cycle.
DATA POLLING CHARACTERISTICS
VCC = 5.0V, VSS = 0V, -55°C ≤ TA ≤ +125°C
Parameter
Data Hold Time
OE# Hold Time
OE# To Output Valid
Write Recovery Time
Symbol Min
Max
Unit
tdh
10
ns
toeh
10
ns
toe
55
ns
twr
0
ns
FIGURE 6 – DATA POLLING WAVEFORMS
WE#
CS#
OE#
t OEH
I/O7 t DH
t OE
HIGH Z
t WR
ADDRESS
TOGGLE BIT: In addition to DATA# Polling another method for
determining the end of a write cycle is provided . During the write
operation, successive attempts to read data from the device will
result in I/O6 toggling between one and zero. Once the write has
completed, I/O6 will stop toggling and valid data will be read.
Reading the toggle bit may begin at any time during the write cycle.
Symbol
tDH
tOEH
tOE
tOEHP
tWR
TOGGLE BUT CHARACTERISTICS(1)
Parameter
Data Hold Time
OE Hold Time
OE to Output Delay
OE High Pulse
Write Recovery Time
Min
Max
10
10
150
0
Units
ns
ns
ns
ns
ns
WE#
CS#
OE#
I/O6 (2)
tOEH
tDH tOE
HIGH Z
NOTE:
1. Toggling either OE# or CS# or both OE# and CS# will operate toggle bit.
2. Beginning and ending state of I/O6 will vary
3. Any address location may be used but the address should not vary.
Microsemi Corporation reserves the right to change products or specifications without notice.
July 2011 © 2011 Microsemi Corporation. All rights reserved.
6
Rev. 7
tWR
Microsemi Corporation • (602) 437-1520 • www.microsemi.com
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