CAT28C64B CATALYST [Catalyst Semiconductor], CAT28C64B Datasheet - Page 9

• Manufacturer Part Number: CAT28C64B
• Description: 64K-Bit CMOS PARALLEL E2PROM
• Manufacturer: CATALYST [Catalyst Semiconductor]

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
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.
Figure 7. DATA Polling
Figure 8. Toggle Bit
Note:
(1)
ADDRESS
Beginning and ending state of I/O
I/O 6
WE
OE
CE
I/O 7
WE
OE
CE
t OEH
D IN = X
6
is indeterminate.
(1)
7
t OEH
t OE
(I/O
0
–I/O
6
D OUT = X
9
t OE
t WC
t WC
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
one and zero. However, once the write is complete, I/O
stops toggling and valid data can be read from the
device.
D OUT = X
(1)
t OES
t OES
6
Doc. No. 25006-0A 2/98 P-1
toggling between
28C64B F10
28C64B F11
6