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Schematic Notes
Model 11848A
Table 8. Schematic Diagram Notes (7 of 11)
REG
SREG
ROM
RAM
Cm
Gm
Vm
mAm
ENm
Xm
Mm
Zm
I
t
/
DIGITAL SYMBOLOGY REFERENCE INFORMATION
Sequential Logic Functions (Cont'd)
Register—Array of unconnected flip-flops that form a simple register or latch.
Shift Register—Array of flip-flops that form a register with internal connections that
permit shifting the contents from flip-flop to flip-flop.
Read Only Memory—Addressable memory with read-out capability only.
Random Access Memory—Addressable memory with read-in and read-out
capability.
Dependency Notation
Control Dependency—Binary affecting input used where more than a simple AND
relationship exists between the C input and the affected inputs and outputs (used
only with D-type flip-flops).
Gate (AND) Dependency—Binary affecting input with an AND relationship to those
inputs or outputs labeled with the same identifier. The m is replaced with a number
or letter (the identifier).
OR Dependency—Binary affecting input with an OR relationship to those inputs or
outputs labeled with the same identifier. The m is replaced with a number or the
letter (the identifier).
Address Dependency—Binary affecting inputs of affected outputs. The m prefix is
replaced with a number that differentiates between several address inputs, indicates
dependency, or indicates demultiplexing of address inputs and outputs. The m suffix
indicates the number of cells that can be addressed.
Enable Dependency—Binary affecting input which, when active enables all outputs.
When inactive open-collector and open-emitter outputs are off, and three-state out
puts are at an external high impedance state.
When the enable input affects only certain inputs and outputs, they will be numbered
to indicate the logic connection.
Transmission Dependency—Binary affecting input which bidirectionaily connects de
pendent inputs and outputs.
Mode Dependency—Binary affecting input used to indicate that the effects of partic
ular inputs and outputs of an element depend on the mode in which the element
is operating. The m is replaced with a number or letter (the identifier).
Interconnection Dependency—Indicates the existence of internal logic connections
between inputs, outputs, internal inputs, and/or internal outputs. The m is replaced
with a number (the identifier).
Comma—AND Function.
Slant—OR Function.
NOTE
The identifier (m) is omitted if it is one—that is, when there is oniy one depen-
dency reiationship of that,kind in a particular device. When this is done, the de-
pendency indicator itself (G, C, EN, or V) is used to prefix or suffix the affected
(dependent) input or output.
84
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