By Donald E. Thomas, Elizabeth D. Lagnese, Robert A. Walker, Jayanth V. Rajan, Robert L. Blackburn, John A. Nestor
Recently there was elevated curiosity within the improvement of computer-aided layout courses to aid the process point dressmaker of built-in circuits extra actively. Such layout instruments carry the promise of elevating the extent of abstraction at which an built-in circuit is designed, therefore freeing the present designers from some of the information of good judgment and circuit point layout. The promise extra means that an entire new team of designers in neighboring engineering and technological know-how disciplines, with some distance much less realizing of built-in circuit layout, may also be capable of raise their productiveness and the performance of the structures they layout. This promise has been made many times as each one new larger point of computer-aided layout device is brought and has time and again fallen wanting success. This booklet offers the result of learn aimed toward introducing but greater degrees of layout instruments that might inch the built-in circuit layout group towards the achievement of that promise. 1. 1. SYNTHESIS OF built-in CmCUITS within the built-in circuit (Ie) layout procedure, a habit that meets convinced requirements is conceived for a process, the habit is used to supply a layout when it comes to a collection of structural good judgment components, and those good judgment parts are mapped onto actual devices. The layout approach is impacted through a suite of constraints in addition to technological details (i. e. the common sense components and actual devices used for the design).
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Extra info for Algorithmic and Register-Transfer Level Synthesis: The System Architect’s Workbench
SELECTDupIication The SELECT Duplication transformation is applied interactively to duplicate a SELECT, not including the operators in its branches; it places that copy into the VT immediately before the original SELECT. When the SELECTs are later implemented, it is assumed that the first SELECT in the series will perform the decoding operation once, and pass microcode dispatch addresses to the following SELECTs - this could be used, for instance, for functional branching [Tredennick80] or pipe lining.
Interconnection Bindings When the value does not need to be stored, interconnections and steering logic in the implementation must form a path from the output of the functional unit bound to xa1 to the input of the functional unit bound to Xa2. This path can be a direct link between the two functional units or include steering logic elements. If steering logic is included in this path, then micro-operations that select the proper steering logic inputs and outputs must be added to the control steps in which the transfer of data takes place.
3. Vtbody Formation Vtbody Formation encapsulates a specified set of operators into a new vtbody, which is then CALLed from the original vtbody. This is the inverse of Vtbody Inline Expansion. An example of Vtbody Formation is shown in Figure 3·3, where an increment statement and its contents are encapsulated into a separate vtbody. 48 Algorithmic and RT Level Synthesis vtbody v1:A vtbody v1:A . x=x+1 v2:INC . V ------------------CAll v2:INC (x) x= x +1 ~tbody ~kEAVE v2:INC Figure 3-3. 2. SELECT TRANSFORMATIONS As described in Chapter 2, in ISPS, IF operations are used for conditional branching, and DECODE operations are used for CASElike decoding.
Algorithmic and Register-Transfer Level Synthesis: The System Architect’s Workbench by Donald E. Thomas, Elizabeth D. Lagnese, Robert A. Walker, Jayanth V. Rajan, Robert L. Blackburn, John A. Nestor