ISSUE 4.2 : November 1998
MFM8126S - 70/90/12
AC Waveforms for Read Operation
Address
Address Valid
t
RC
CS
t
CE
t
OE
OE
t
DF
WE
t
ACC
HIGH Z
t
OH
Output
Valid
HIGH Z
Data Out
AC Programming Waveforms
Data Polling
Address
5555H
t
t
AS
PA
t
AH
PA
t
RC
CS
t
GHWL
OE
t
WP
t
WHWH1
t
OE
t
DF
WE
t
CS
A0H
t
WPH
t
DH
PD
D7
D
OUT
DATA
5.0 V
t
DS
t
CE
t
OH
Notes:
1. PA is address of the memory location to be programmed.
2. PD is data to be programmed at byte address.
3. D
7
is the output of the complement of the data written to the device.
4. D
OUT
is the output of the data written to the device.
5. Figure indicates last two bus cycles of four bus cycle sequence.
6