Notes

I make timing diagram for the sram's behavior (wavedrom)

{ "signal" : [
  { "name": "clk",         "wave": "p..........." },
  { "name": "clk_25",      "wave": "p.....", "period":2},
  { "name": "we",          "wave": "0.10.10..110" },
  { "name": "wxyc",        "wave": "x.=x.=x..==x", data: ["w1", "w2", "w3", "w4"]},
  { "name": "re",          "wave": "0...1.0.1.1." },
  { "name": "rxyc",        "wave": "x...=.x.=.=.", data: ["r1", "r2", "r3"]},
  { "name": "addr",        "wave": "0.=0==0..===", data: ["w1", "r1", "w2", "w3", "r3", "w4"] },
  { "name": "first (rre)",        "wave": "0...10....10", data: ["r1", "r2", "r3"]},
]}

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New notes here