ITT - Index of

ITT7520
SENSE AMPLIFIERS
Large Memory Systems
This application demonstrates an improved
method of sensing data from large memory
systems. The signal-to-noise ratio can be increased
by sectioning the large core planes as
illustrated in Figure L. Two segments, usually
consisting of 409.6 cores each, can be interfaced
by each of the dual-input channels of
ITT7420/ITT7421 or ITT74221lTT7423 sense
amplifiers. The cascaded output gates of ITT-
7520/lTT7521 circuits may be connected to
serve as the memory data register (MDR). A
number of ITT7522/ITT7523 sense amplifiers
may be wire-AND connected to expand the input
function of the MDR to interface all the
segments of the plane. Complementary outputs,
clear, and preset functions are provided for the
MDR. Rules for combined fan-out and wire­
AND capabilities must be observed.
SEGMENT A
4096 CORES
(Typical)
SEGMENTED CORE PLANE (reprot:lntl onG bit in momory word)
STROBE J""L
SENSE LINE 1A r: - - - - --- - ~2;;;r 7521-:;;;---l
Output Connoctsd as
Memory Dati Register
(MDR)
SEGMENT B
4096 CORES
(Typical)
SENSE LINE 1B
I
L __ _
IO--r-.... -O z
Y}MDR
OUTPUTS
SEGMENT C
4096 CORES
(Typical)
SEGMENT 0
4096 CORES
(Typical)
SENSE LINE 1C r;; - - -
RT RT I
I
~NSE LI:E 10 I
MDR CLEAR (GATE Gz)
- - - 7522 ;;;-1523.;;;j - - "I
as sense· input expander
for 7520 or 7521
I
I
I
I
I
I
I
I
I
- _______ -.J
-U-
MDR PRESET (GATE)
~--------------------------~vr-----------------------------'
To additional 7522's or 1523', to
provide necessary numbor of sensa inputs
Figure L-Sensing Large Memory Systems
WIRE·AND
CONNECTION
6-47