參數(shù)資料
型號: CAT28HT64
英文描述: 64K-Bit CMOS Parallel EEPROM(5V,快速,低功耗,64K位(8K x 8位)并行CMOS EEPROM)
中文描述: 64K的位CMOS并行的EEPROM(5V的,快速,低功耗,64K的位(8K的× 8位)并行的CMOS EEPROM的)
文件頁數(shù): 8/10頁
文件大?。?/td> 219K
代理商: CAT28HT64
CAT28HT64
8-46
Advanced
Stock No. 21064-04 2/98
DATA Polling
DATA polling is provided to indicate the completion of
write cycle. Once a byte write or page write cycle is
initiated, attempting to read the last byte written will
output the complement of that data on I/O
7
(I/O
0
–I/O
6
are indeterminate) until the programming cycle is com-
plete. Upon completion of the self-timed write cycle, all
I/O’s will output true data during a read cycle.
Toggle Bit
In addition to the DATA Polling feature, the device offers
an additional method for determining the completion of
a write cycle. While a write cycle is in progress, reading
data from the device will result in I/O
6
toggling between
one and zero. However, once the write is complete, I/O
6
stops toggling and valid data can be read from the
device.
Figure 7. DATA Polling
28HT64 F10
Figure 8. Toggle Bit
28HT64 F11
Note:
(1)
Beginning and ending state of I/O
6
is indeterminate.
ADDRESS
CE
WE
OE
I/O7
DIN = X
DOUT = X
DOUT = X
tOE
tOEH
tWC
tOES
WE
CE
OE
I/O6
tOEH
tOE
tOES
tWC
(1)
(1)
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