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Read line
is Active
Too Soon
O-r='\---r--,'"1-.::-r--r,..'T""--..-_,,~..,_7""1,_.111\1
~LS.
Read Line (A-BlE5B09)
i----w.---.-~+---+- ..... -+----+-....... --ii----i-L.S. Bus Bit l (A-BlE7D04)
[1st Bit is False Turn On
Due to Read Disturb
on Sense Amplifier]
40 ns/Div
2V per cm
Figure 1-140. Bad waveforms (Read Line Set Too Early--Zero
Delay)
Read Line
Should
Never Appear
as a Spike
0-
,-..r-r;~-:::=-~~---..-..--.,~...,.-...,_.....,_
L.S. Read Line (A-BlE5B09)
[Read Line Shou Id Never
be a Glitch]
XO Address Line (A-B 1 E7D04)
[Address Lines are Shorter
in Duration than Normal]
.1--illi--+---t--t--t--1-L.S. Bus Bit 1 (A-BlE7D04)
Address Line
Good for Too
Short an Interval
100 ns/Div
2 Volts/cm
Figure 1-141. Bad Waveforms (LS Address Line Reset Delay Bad--Zero Delay)
2025 FEMM (7 /69)
1-139
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