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Electric Egineering latencies question

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You are given the following hardware:

  • A 16-bit PC register,
  • An instruction memory with 1 read port (16-bit address input and 32-bit data output),
  • A register file with 3 read ports and 1 write port (4-bit address inputs and 16-bit data output) where reading address 15 always gives zero
  • An ALU with two 16-bit inputs that can perform all the operations listed above, with registers N and Z that store whether the last result is negative and zero respectively,
  • A data memory with 1 read/write port (16-bit address & data inputs and data output),
  • Additional multiplexers, gates, and pipeline stage registers as needed.

  • Build a 6-stage pipelined datapath for this architecture. Given the following latencies, determine the minimum delay for each pipeline stage. You may ignore all other latencies. [15 pts]

Access

Read from

16-bit

Write to data

Read from

Write to

instruction

data

ALU

register file

adder

memory

register file

memory

memory

120 ps

100 ps

80 ps

140 ps

120 ps

120 ps

110 ps

  • Write an example code snippet in this architecture that contains two different data hazards: one that can be resolved by forwarding and one that would require stalling the pipeline. [5 pts]

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