Sequencer realization

1
Sequencer realization

• Sequencer area, delay, energy
• Area 5 gate equivalents
• Delay per cycle 8 gate delays
• Energy per cycle 10 transitions

2
Tangram assignment x f(y,z)
Handshake circuit
3
Transferrer

• ? a?? (b?? c??) a??
  (b?? cd bd c?? cd ?)

4
Multiplexer

• ? a?? c?? a?? (cd ad c?? cd
  ?) b?? c?? b?? (cd bd c?? cd
  ?)
• Restriction ?ar ? ?br must hold at all times!

5
Multiplexer realization
control circuit
data circuit
6
Logic/arithmetic operator

• ? a?? (b?? c??) a?? ((b??
  c??) ad f(bd , cd ))
• Cheaper realization (delay sensitive)
• ? a?? (b?? c??) a?? ((b??
  c??) ad f(bd , cd )) delay ad
  ?

7
A one-place fifo buffer
byte type 0..255 BUF1 main
proc(a?chan byte b!chan byte).begin x var
byte forever do a?x b!x odend
8
A one-place fifo buffer
byte type 0..255 BUF1 main
proc(a?chan byte b!chan byte).begin x var
byte forever do a?x b!x odend
?
a
x
b
x
9
2-place buffer

• byte type 0..255
• BUF1 proc (a?chan byte b!chan byte).begin
  x var byte forever do a?x b!x od end
• BUF2 main proc (a?chan byte c!chan
  byte).begin b chan byte BUF1(a,b)
  BUF1(b,c) end

10
Two-place ripple buffer
11
4-place ripple register

• byte type 0..255 rip4 main proc
  (a?chan byte b!chan byte). begin x0,
  x1, x2, x3 var byte forever do b!x3
  x3x2 x2x1 x1x0 a?x0 od end

12
4-place ripple register

• area N (Avar Aseq )
• cycle time Tc (N1) T
• cycle energy Ec N E

13
4-place wagging register

• forever do b!x1 x1x0 a?x0 b!y1
  y1y0 a?y0od