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16K STORAGE OPERATION
•
The 16K storage unit is composed of nine core planes.
•
The X-return wires connect the two 8K units in the X-
direction.
•
Phase reversal takes place between the two 8K.units so
only one unit is addressed at a time.
Description
The 16K storage unit contains nine core
planes.
The planes are wound so that two
8K storage units are produced (Figure 2-81).
The X windings thread through all nine core
planes, cross over to the other half of the
array, then thread back through the upper
halves of these same core planes.
The Y-
winding is one set of 128 lines threading
through all core planes.
The result is
that if one X-winding and one Y-winding are
driven with drive current, nine cores ex-
perience coincident drive current.
Because
the X-winding undergoes a phase reversal
between 8K units, the respective cores in
the other half of the array do not exper-
ience coincident drive current.
To address
th~
similar position in the second 8K block
of storage, the drive current must be re-
versed (Figure 2-82).
This control takes
place at the X-control drivers and at the
X-source drivers.
X-2
Drive
Read lst 8K
Y-I X-I
Read 2nd 8K
Y-I X-2
Write lst 8K
Y -2 X-2
Writ. 2nd 8K Y-2 X-I
Y-2
Figure 2-81.
16K Storage Phase Reversal
2-88
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