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Design at the RTL level is typical practice in modern digital design. [1] Unlike in software compiler design, where the register-transfer level is an intermediate representation and at the lowest level, the RTL level is the usual input that circuit designers operate on.
Synthesis tools compiled HDL source files (written in a constrained format called RTL) into a manufacturable netlist description in terms of gates and transistors. Writing synthesizable RTL files required practice and discipline on the part of the designer; compared to a traditional schematic layout, synthesized RTL netlists were almost always ...
The file select register (FSR) is written with the address of the desired memory operand, after which; The indirect file register (INDF) becomes an alias for the operand pointed to by the FSR. This mechanism also allows up to 256 bytes of memory to be addressed, even when the instruction set only allows 5- or 7-bit absolute addresses.
A formal equivalence check can be performed between any two representations of a design: RTL <> netlist, netlist <> netlist or RTL <> RTL, though the latter is rare compared to the first two. Typically, a formal equivalence checking tool will also indicate with great precision at which point there exists a difference between two representations.
The implicit directional marks are non-printing characters used in the computerized typesetting of bi-directional text containing mixed left-to-right scripts (such as Latin and Cyrillic) and right-to-left scripts (such as Persian, Arabic, Syriac and Hebrew).
RTL is the earliest class of transistorized digital logic circuit; it was succeeded by diode–transistor logic (DTL) and transistor–transistor logic (TTL). RTL circuits were first constructed with discrete components , but in 1961 it became the first digital logic family to be produced as a monolithic integrated circuit .