Project Step 2 – A single bit slice of the ALU Structural Modeling 1 1/8/2007 - L5 PS2 Structural Slice Copyright 2006 - Joanne DeGroat, ECE, OSU

Copyright 2006 - Joanne DeGroat, ECE, OSU Project Step Overview Write the Entity and Architecture for the carry chain bit slice block of the multifunction ALU Use it and the generic unit from Project Step 1 to generate a single slice of the ALU 1/8/2007 - L5 PS2 Structural Slice Copyright 2006 - Joanne DeGroat, ECE, OSU

Detailed of code you write The Entity for the Carry Chain Unit The Architecture (dataflow style) of the Carry Chain Unit An Entity and Architecture for the single slice of the ALU This will require external interface for all inputs and outputs of a single slice 1/8/2007 - L5 PS2 Structural Slice Copyright 2006 - Joanne DeGroat, ECE, OSU

Copyright 2006 - Joanne DeGroat, ECE, OSU Signals needed The single slice interface Data – A, B P block control – P(0 to 3) K block control – K(0 to 3) Carry In Carry Out R block control – R(0 to 3) Results output – F Internal Signals for P and K, Pint and Kint 1/8/2007 - L5 PS2 Structural Slice Copyright 2006 - Joanne DeGroat, ECE, OSU

Plus component instantiations To instantiate a component that has been compiled into the library First declare it in the declarative region of the architecture This is easiest done by simply copying the Entity interface of the unit and changing ENTITY to COMPONENT, delete the IS, and change the END unit_name to END COMPONENT Also, do a configuration also in this region 1/8/2007 - L5 PS2 Structural Slice Copyright 2006 - Joanne DeGroat, ECE, OSU

Copyright 2006 - Joanne DeGroat, ECE, OSU The configuration For these first examples just use FOR ALL : unit_label_used_in_component_decl USE ENTITY WORK.unit_name(arch_name); Will see later that ALL can be changed to specific instantiation labels. The unit_label must match that of the component declaration when you instantiate it in the Architecture Assuming that you have called your library WORK 1/8/2007 - L5 PS2 Structural Slice Copyright 2006 - Joanne DeGroat, ECE, OSU

Copyright 2006 - Joanne DeGroat, ECE, OSU The instantiation Once declared and configured the unit can be use between the BEGIN and END of the ARCHITECTURE (instantiated) Provide a label for the instantiation Use named signals to wire to the inputs and outputs. 1/8/2007 - L5 PS2 Structural Slice Copyright 2006 - Joanne DeGroat, ECE, OSU

Copyright 2006 - Joanne DeGroat, ECE, OSU Turn in requirements Turn in: (Carmen drop box) A copy of your code Your code will be very similar to every other students but it won’t be exact. A copy of the complete waveform and a copy zoomed into 0 to 650ns A copy of the listing file after you have “collapsed deltas” and set the radix to hex 1/8/2007 - L5 PS2 Structural Slice Copyright 2006 - Joanne DeGroat, ECE, OSU