MIPS data path for store word? -

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based on figure, executing sw instruction cause these values assigned signals labeled in blue: 

    regwrite = 0     alusrc = 1     alu operation = 0010     memread = 0     memwrite = 1     memtoreg = x     pcsrc =

however, little confused inputs used in registers block? can describe overall sw procedure in mips datapath?

the execution of sw follow following steps in diagram:

  1. instruction read , decoded pc in instruction memory subcircuit.
  2. the register file read $rs , $rt (registers subcircuit)
  3. the value of $rs added sign extended immediate (selected alusrc) (alu subcircuit).
  4. the added value , $rt passed data memory subcircuit value of $rt written memory.

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