We want to add register R2 and R5 and write result back in R3

1
Control sequence to add two registers

• We want to add register R2 and R5 and write
  result back in R3
• Set RA1010, RA2101, WA011, WR1, OpCode100,
  SC00, LDM0, EMR0, EALU1, EI0, WOUT0, WM0,
  RM0, EM0, WAD0

2
Control sequence to read memory into R3

• We want to read a memory location into R3
• Which memory location? Say address is in R2
• Two steps, transfer R2 in Addr register in one
  cycle
• Then read memory into R3 in the next cycle
• Why cant we do in one cycle?

3
Control sequence to write memory into R3

• Next we want to write contents of R3 in memory
  location whose address is in R2
• Again we need two steps
• Transfer R2 in Addr register in one cycle
• Then write contents of R3 in the next cycle
• Write control signals for two steps