X88064 Datasheet, PDF (5/15 Pages) Xicor Inc. – E2 Micro-Peripheral

X88064
PAGE WRITE OPERATION
Regardless of the microcontroller employed, the X88064
supports page mode write operations. This allows the
microcontroller to write from one to thirty-two bytes of
data to the X88064. Each individual write within a page
write operation must conform to the byte write timing
requirements. The falling edge of WR starts a timer
delaying the internal programming cycle 100µs. There-
fore, each successive write operation must begin within
100µs of the last byte written. The following waveforms
illustrate the sequence and timing requirements.
Page Write Timing Sequence for WR Controller Operation
OPERATION
BYTE 0
BYTE 1
BYTE 2
LAST BYTE
CE
ALE
A/D₀ –A/D ₇
A₈ –A₁₂
A_IN D_IN
A12=n
A_IN D_IN
A12=n
A_IN D_IN
A12=n
A_IN
D_IN
A12=n
WR
READ (1)
A_IN D_OUT
A12=x
AFTER t_WC READY FOR
NEXT WRITE OPERATION
A_IN
ADDR
A_IN
Next Address
PSEN(RD)
t_BLC
t_WC
Notes: (1) For each successive write within a page write cycle A₅–A₁₂ must be the same.
7023 FRM F04
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