Download E-books High-Level Synthesis: from Algorithm to Digital Circuit PDF

This publication offers an exceptional selection of contributions addressing various facets of high-level synthesis from either and academia. It contains an outline of obtainable EDA instrument options and their applicability to layout problems.

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Figures nine. 3–9. five current effects supplied through the characterization step. nine. three. 1. four Operation Clustering For clustering operations we recommend to mix the computational functionality and the operation hold up. this permits to in some way examine operation’s bit-width because the propagation time of an operator will depend on its operand’s measurement. for you to maximize 9 GAUT: A High-Level Synthesis software for DSP functions 153 using operators, one operation that belongs to a cluster C1 with a propagation time t1 may be assigned to operators allotted for a cluster C2 if the propagation time t2 is larger than t1. nine. three. 2 Processing Unit Synthesis The layout of the Processing Unit (PU) integrates the subsequent initiatives: source choice and allocation, operation scheduling, and binding of operations onto operators. First, GAUT executes the allocation activity, after which executes the scheduling and the project projects (see Figs. nine. 2 and nine. 6). Inputs: DFG, timing constraint and source allocation Output: A scheduled DFG commence cstep = zero; Repeat till the final node is scheduled make sure the prepared operations RO; Compute the operations mobility; whereas there are RO If there can be found assets time table the operation with the top precedence; eliminate source from on hand source set; If the present operation belongs to a chaining trend replace the prepared operations RO; If there can be found assets agenda the operations equivalent to the development; eliminate assets from to be had source set; finish if finish if Else If the operations could be behind schedule hold up the operations; Else Allocate assets (FUs); agenda the operations; finish if finish if finish whereas Bind all of the scheduled operations; cstep++; finish Fig. nine. 6 Pseudo code of the scheduling set of rules 154 P. Coussy et al. nine. three. 2. 1 source Allocation Allocation defines the kind and the numbers of operators had to fulfill the layout constraints. In our process, in an effort to recognize the throughput requirement laid out in the fashion designer, allocation is finished for every a priori pipeline level. The variety of a priori pipeline level is computed because the ratio among the minimal latency, Latency, of the DGF (i. e. the longest information dependency direction within the graph) and the Initiation period II (i. e. the interval at which the applying has to (re)iterate): Latency/II . hence we compute the common parallelism of the appliance extracted from the DFG dated by means of an once attainable (ASAP) unconstrained scheduling. the common parallelism is calculated individually for every kind of operation and for every pipeline degree s of the DGF, comprising the set of the date operations belonging to [s. II, (s+1). II]. the typical variety of operators, for a given operation variety kind, that's allotted to an a priori pipeline degree is outlined as keep on with: ⎤ ⎡ ops(type) nb ⎥ avr opr(type) = ⎢ ⎥ ⎢ II T clk ⎥ ⎢ T (opr) ∗ II(opr) with Tclk the clock interval, nb ops(type) the variety of operators of style kind that belong to the present pipeline degree, T(opr) the propagation time of the operator and II(opr) the new release interval of pipelined operators.

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