WME128K8-140CM 查看數據表（PDF） - White Electronic Designs Corporation
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WME128K8-140CM Datasheet PDF : 11 Pages
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White Electronic Designs
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.
TOGGLE BUT CHARACTERISTICS(1)
Symbol
tDH
tOEH
tOE
tOEHP
tWR
Parameter
Data Hold Time
OE Hold Time
OE to Output Delay
OE High Pulse
Write Recovery Time
Min Max Units
10
ns
10
ns
ns
150
ns
0
ns
WE#
CS#
OE#
tOEH
tDH tOE
HIGH Z
I/O6 (2)
tWR
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.
White Electronic Designs Corp. reserves the right to change products or specifications without notice.
January 2004
Rev. 5
6
White Electronic Designs Corporation • (602) 437-1520 • www.wedc.com
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