caltech cs184 winter2003 -- dehon 1 cs184a: computer architecture (structure and organization) day...
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Caltech CS184 Winter DeHon 3 Today Cascades ALUs PLAsTRANSCRIPT
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Caltech CS184 Winter2003 -- DeHon1
CS184a:Computer Architecture
(Structure and Organization)
Day 10: January 31, 2003Compute 2:
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Caltech CS184 Winter2003 -- DeHon2
Last Time
• LUTs– area– structure– big LUTs vs. small LUTs with interconnect– design space– optimization
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Caltech CS184 Winter2003 -- DeHon3
Today
• Cascades• ALUs• PLAs
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Caltech CS184 Winter2003 -- DeHon4
Last Time
• Larger LUTs– Less interconnect delay
• General: Larger compute blocks– Minimize interconnect
• Large LUTs– Not efficient for typical logic structure
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Caltech CS184 Winter2003 -- DeHon5
Different Structure
• How can we have “larger” compute nodes (less general interconnect) without paying huge area penalty of large LUTs?
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Caltech CS184 Winter2003 -- DeHon6
Structure in subgraphs
• Small LUTs capture structure
• What structure does a small-LUT-mapped netlist have?
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Caltech CS184 Winter2003 -- DeHon7
Structure
• LUT sequences ubiquitous
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Caltech CS184 Winter2003 -- DeHon8
Hardwired Logic Blocks
Single Output
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Caltech CS184 Winter2003 -- DeHon9
Hardwired Logic Blocks
Two outputs
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Caltech CS184 Winter2003 -- DeHon10
Delay Model
• Tcascade =T(3LUT) + T(mux)
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Caltech CS184 Winter2003 -- DeHon11
Options
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Caltech CS184 Winter2003 -- DeHon12
Chung & Rose Study
[Chung & Rose, DAC ’92]
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Caltech CS184 Winter2003 -- DeHon13
Cascade LUT Mappings
[Chung & Rose, DAC ’92]
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Caltech CS184 Winter2003 -- DeHon14
ALU vs. Cascaded LUT?
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Caltech CS184 Winter2003 -- DeHon15
4-LUT Cascade ALU
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Caltech CS184 Winter2003 -- DeHon16
ALU vs. LUT ?
• Compare/contrast• ALU
– Only subset of ops available– Denser coding for those ops– Smaller– …but interconnect dominates
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Caltech CS184 Winter2003 -- DeHon17
Parallel Prefix LUT Cascade?
• Can compute LUT cascade in O(log(N)) time?
• Can compute mux cascade using parallel prefix?
• Can make mux cascade associative?
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Caltech CS184 Winter2003 -- DeHon18
Parallel Prefix Mux cascade
• How can mux transform Smux-out?– A=0, B=0 mux-out=0– A=1, B=1 mux-out=1– A=0, B=1 mux-out=S– A=1, B=0 mux-out=/S
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Caltech CS184 Winter2003 -- DeHon19
Parallel Prefix Mux cascade
• How can mux transform Smux-out?– A=0, B=0 mux-out=0 Stop= S– A=1, B=1 mux-out=1 Generate= G– A=0, B=1 mux-out=S Buffer = B– A=1, B=0 mux-out=/S Invert = I
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Caltech CS184 Winter2003 -- DeHon20
Parallel Prefix Mux cascade
• How can 2 muxes transform input?• Can I compute transform from 1 mux
transforms?
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Caltech CS184 Winter2003 -- DeHon21
Two-mux transforms
• SSS• SGG• SBS• SIG
• GSS• GGG• GBG• GIS
• BSS• BGG• BBB• BII
• ISS• IGG• IBI• IIB
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Caltech CS184 Winter2003 -- DeHon22
Generalizing mux-cascade
• How can N muxes transform the input?• Is mux transform composition
associative?
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Caltech CS184 Winter2003 -- DeHon23
Parallel Prefix Mux-cascade
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Caltech CS184 Winter2003 -- DeHon24
Commercial Devices
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Caltech CS184 Winter2003 -- DeHon25
Xilinx XC4000 CLB
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Caltech CS184 Winter2003 -- DeHon26
Xilinx Virtex-II
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Caltech CS184 Winter2003 -- DeHon27
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Caltech CS184 Winter2003 -- DeHon28
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Caltech CS184 Winter2003 -- DeHon29
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Caltech CS184 Winter2003 -- DeHon30
Altera Stratix
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Caltech CS184 Winter2003 -- DeHon31
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Caltech CS184 Winter2003 -- DeHon32
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Caltech CS184 Winter2003 -- DeHon33
Programmable Array Logic(PLAs)
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Caltech CS184 Winter2003 -- DeHon34
PLA
• Directly implement flat (two-level) logic– O=a*b*c*d + !a*b*!d + b*!c*d
• Exploit substrate properties allow wired-OR
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Caltech CS184 Winter2003 -- DeHon35
Wired-or
• Connect series of inputs to wire• Any of the inputs can drive the wire high
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Caltech CS184 Winter2003 -- DeHon36
Wired-or
• Implementation with Transistors
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Caltech CS184 Winter2003 -- DeHon37
Programmable Wired-or
• Use some memory function to programmable connect (disconnect) wires to OR
• Fuse:
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Caltech CS184 Winter2003 -- DeHon38
Programmable Wired-or
• Gate-memory model
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Caltech CS184 Winter2003 -- DeHon39
Diagram Wired-or
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Caltech CS184 Winter2003 -- DeHon40
Wired-or array
• Build into array– Compute many different or functions from
set of inputs
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Caltech CS184 Winter2003 -- DeHon41
Combined or-arrays to PLA
• Combine two or (nor) arrays to produce PLA (and-or array)
ProgrammableLogicArray
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Caltech CS184 Winter2003 -- DeHon42
PLA
• Can implement each and on single line in first array
• Can implement each or on single line in second array
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Caltech CS184 Winter2003 -- DeHon43
PLA
• Efficiency questions:– Each and/or is linear in total number of
potential inputs (not actual)– How many product terms between arrays?
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Caltech CS184 Winter2003 -- DeHon44
PLAs
• Fast Implementations for large ANDs or Ors• Number of P-terms can be exponential in
number of input bits – most complicated functions– not exponential for many functions
• Can use arrays of small PLAs– to exploit structure– like we saw arrays of small memories last time
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Caltech CS184 Winter2003 -- DeHon45
PLA Product Terms
• Can be exponential in number of inputs• E.g. n-input xor (parity function)
– When flatten to two-level logic, requires exponential product terms
– a*!b+!a*b– a*!b*!c+!a*b*!c+!a*!b*c+a*b*c
• …and shows up in important functions– Like addition…
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Caltech CS184 Winter2003 -- DeHon46
PLAs vs. LUTs?• Look at Inputs, Outputs, P-Terms
– minimum area (one study, see paper)– K=10, N=12, M=3
• A(PLA 10,12,3) comparable to 4-LUT?– 80-130%?– 300% on ECC (structure LUT can exploit)
• Delay? – Claim 40% fewer logic levels (4-LUT)
• (general interconnect crossings)
[Kouloheris & El Gamal/CICC’92]
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Caltech CS184 Winter2003 -- DeHon47
PLA
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Caltech CS184 Winter2003 -- DeHon48
PLA and Memory
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Caltech CS184 Winter2003 -- DeHon49
PLA and PAL
PAL = Programmable Array Logic
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Caltech CS184 Winter2003 -- DeHon50
Conventional/Commercial FPGA
Altera 9K (from databook)
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Caltech CS184 Winter2003 -- DeHon51
Conventional/Commercial FPGA
Altera 9K (from databook)
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Caltech CS184 Winter2003 -- DeHon52
Big Ideas[MSB Ideas]
• Programmable Interconnect allows us to exploit that structure– want to match to application structure– Prog. interconnect delay expensive
• Hardwired Cascades– key technique to reducing delay in programmables
• PLAs– canonical two level structure– hardwire portions to get Memories, PALs
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Caltech CS184 Winter2003 -- DeHon53
Big Ideas[MSB-1 Ideas]
• Better structure match with hardwired LUT cascades