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Figure 2-2 shows a 4 by 4 core plane. The X-drive lines
run horizontally and the Y-drive lines run vertically. If half
the required current passes through the X-drive line labeled
A and half through the Y-drive line labeled B, only the
shaded core is set (it is the only core receiving full current).
Current through these two lines in one direction sets the
core to bit status (write current). Current through the same
two lines in the opposite direction resets the core to no-bit
status (read current).
When a current passes through these lines in the read direc-
tion and the core is already reset (no-bit), it will not change.
However, if the core is set (bit), it will change status. We
must be able to detect this change of status to know whether
the core contained a bit or no-bit. This is done by passing
one wire (sense line) through all the cores. When a core
changes status, it induces a voltage in the sense line and this
voltage is sensed as a bit.
Y-Drive Lines
The 5410 arrays contain either five, nine, or 18 core planes.
Every plane has two separate inhibit windings. An inhibit
winding passes through every core in the plane. When write
current passes through X- and Y-drive lines, it passes through
the selected cores of all planes. If we do not want to write
a bit in a specific plane, current passes through the inhibit
winding. The inhibit current is _.equal to and in the opposite
direction of the current in the X-drive line. This cancels
the effect of the current in the X-drive line and no-bit is
written in that plane.
In the 5410, the same wire handles the sense and inhibit
functions.
5410 BSMs
Figure 2-3 is an overview of the 5410 BSMs. The separate
functions of each part of the BSM are discussed in the
following text.
--~~~--.A..--~~~~-
1
'
Sense/Inhibit {
Lines
X-Drive
Lines
Figure 2-2. Core Selection
2-2
A
Y' -Drive Lines
X-Drive
Lines
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