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CSC258H1 (46)
Lecture

mar06ce.docx

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Department
Computer Science
Course Code
CSC258H1
Professor
Steve Engels

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Description
 Registers and Memory – the “Storage Thing” o Controlling the flow o Beyond the units that store a single value (program counters,  Memory has a conduct (bus) from the main part (registers, ALU) instruction registers) there are units in the CPU that stores multiple to where memory is b/c memory is separated from the CPU data values for use by the CPU:  There is a main line from memory to CPU since only need  REGISTERS – small number of fast memory units that allow to access one line in memory at a time; not separate lines multiple values to be read and written simultaneously for each lines of memory; other lines are sealed  Ex. in A*B multiplication, any intermediary values is  Implication: CPU only need m-bits to connect to memory, m stored here, such as P at each iteration rather than accessing 2 connections to memory  32 spots, most are allocated for special purpose  access  Since some lines (bus) will now be used for both input and only to 20 – 25 of them output, use new gate called the tri-state buffer  MAIN MEMORY – larger grid of memory cells that are used to  A bus is n-bit wide, access entire row of memory at once store the main information to be processed by the CPU  When WE (write enable) signal is low, buffer output is a high  RAM sticks, made up of registers impedance signal  Ex. in A*B multiplication, final P value is stored inhere  output is either connected to high voltage or the ground  Use WE to access one line of memory at a time, while WE is high for one line its low for all the other lines  Y is the n-bit bus shared between all the lines of memory  WE = 1 then output Y is input A  WE = 0 then doesn’t matter what A is Y is not connected
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