Module assignment

The commercial 2D structure editor. Chemistry 4D-Draw, from Chemlnnovativc Software Inc., includes two additional special modules besides conventional chemical drawing tools. NamExpert provides the interpretation ofa compound name according to the lUPAC nomenclature to create the corresponding chemical structure. The latter can be represented in three different styles the shorthand. Kckulc. or semi-structural formula. In contrast to NamExpert, the Nomenclature module assigns lUPAC names to drawn structures. 

The University of Surrey offers a taught Master of Science programme in Pharmaceutical Medicine which involves 12 modules, including eight core and four selected from a number of options. The MSc is gained following satisfactory completion of the module assignments and a 25 000-word dissertation in an area of pharmaceutical medicine. 

This work demonstrates the power of the ESEM technique when used in conjunction with ESR for the study of paramagnetic species in zeolites. Accurate measurements of the Cu2" " locations in zeolite A have been determined via cesium modulation. Assignments have been made to many ESR spectra in terms of coordination numbers and orientation of interacting species by ESEM analysis. In many cases unique structural data can be obtained by combined ESR and ESEM methods. 

N. Park and F. J. Kurdahi. Module assignment and interconnect sharing in register-transfer synthesis of pipelined data paths. In Proc. IEEE Int. Conf. Comp. Aided Design, Santa Clara CA, pages 16-19, Nov 1989. 

High-level synthesis has been an active area of research for over 20 years. The main problems involved, such as scheduling, allocation and module assignment, have been well characterized and solved. Nevertheless, high-level synthesis systems are not yet common on the marketplace. We see four principal reasons for this. 

Allocation, which assigns each operation to a piece of hardware. Allocation involves both the selection of the type and quantity of hardware modules from a library (often called module assignment) and the mapping of each operation to the selected hardware. Allocation is sometimes called data path synthesis or data path allocation. 

Constraints on the number of single-function functional units (e.g., the maximum number of subtracters) are derived in a way similar to timing constraints. Multi-function functional units, require a more elaborate constraint generation based on a previous module assignment step which will be explained in the next section. 

Figure 6, Example (a), aU possible module assignments (b), non-optimal assignment (c), optimal assignment (d)...

The complexity of the module assignment algorithm for one path is derived as 0(n X /), where n is the number of nodes in the path and/ is the number of functional units. Further details are given in [3]. 

In HIS, module assignment is performed during constraint generation, prior to scheduling (and allocation). In this way, all further synthesis steps can be performed with given modules, regardless of the library used. 

The register signment is done before the module assignment because many of the relevant information of the module assignment is already available due to the pieassignment step in the scheduling phase. Finally, in the case of a bus oriented data path, the data transfers are assigned to busses. 

For the module assignment the preferences are based on common operands. Examples are ... 

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