WE128K32P-200H1IA(2006) Ver la hoja de datos (PDF) - White Electronic Designs => Micro Semi
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WE128K32P-200H1IA
(Rev.:2006)
(Rev.:2006)
White Electronic Designs => Micro Semi
WE128K32P-200H1IA Datasheet PDF : 14 Pages
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White Electronic Designs
WE128K32-XXX
DATA POLLING
The WE128K32-XXX offers a data polling feature which
allows a faster method of writing to the device. Figure 8
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 D7 (for each chip.) 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, TA = -55°C to +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 8 – DATA POLLING WAVEFORMS
WE1-4#
CS1-4#
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 Parameter
Min
Max
Units
tDH Data Hold Time
10
ns
tOEH OE# Hold Time
10
ns
tOE OE# to Output Delay
ns
tOEHP OE# High Pulse
150
ns
tWR Write Recovery Time
0
ns
WE#
CS#
OE#
tOEH
tDH tOE
I/O6 (2)
HIGH Z
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.
March 2006
Rev. 10
7
White Electronic Designs Corporation • (602) 437-1520 • www.wedc.com
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