Understand the difference.

Compare the meaning, drawing context and source references of two entries. A similar graphic or shared abbreviation does not establish equivalence.

SRG4

IEC

IEC bidirectional (universal) shift register

A universal shift register is drawn as an SRG element with two mode-select inputs grouped to produce modes 0 to 3. The clock label shows shift right under one mode and shift left under another, while data inputs are labelled with their mode and control numbers, such as 1,4D for serial right input and 3,4D for parallel load.

Drawing use

Schematic

Application

Logic & signals

Reference family

IEC / Manufacturer

Form evidence

SRGm element with mode inputs selecting shift right, shift left and parallel load. Qualifying-symbol and dependency conventions as explained in TI's public overview of IEEE Std 91-1984, which incorporates IEC 617-12 work. Independent educational drawing; not certified IEC geometry or an IEC database identifier.

A distinction that matters

A single-direction SRG register has no mode inputs and shifts only one way.

Full referenceAdd to legend

SRG8

IEC

IEC shift register (SRGm)

SRGm identifies a shift register of m bits. The clock input is labelled with C1 and a shift arrow, showing that each active edge moves data one place. The serial input is labelled 1D, and the parallel outputs are listed down the right side, typically in a column of per-bit elements under a common-control block.

Drawing use

Schematic

Application

Logic & signals

Reference family

IEC / Manufacturer

Form evidence

Rectangular element with SRGm qualifier and a shift-right clock. Qualifying-symbol and dependency conventions as explained in TI's public overview of IEEE Std 91-1984, which incorporates IEC 617-12 work. Independent educational drawing; not certified IEC geometry or an IEC database identifier. The counterpart is the matching functional concept; no equivalence of every detailed standard graphic is asserted.

A distinction that matters

A latched shift register adds a storage register and its own clock between the shift stages and the outputs.

Full referenceAdd to legend

Original educational previews. Follow the source references on each full entry for the appropriate standard or selected product.