INF5470 Fall 2011 Lecture 5: Neuromorphic Communication Content - - PowerPoint PPT Presentation

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INF5470 Fall 2011 Lecture 5: Neuromorphic Communication Content The AER protocol Collision Handling Serial AER Weekly Questions Lecture 5: Neuromorphic Communication 2 Content The AER protocol Collision Handling Serial AER Weekly

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INF5470 — Fall 2011

Lecture 5: Neuromorphic Communication

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Content

The AER protocol Collision Handling Serial AER Weekly Questions

Lecture 5: Neuromorphic Communication 2

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Content

The AER protocol Collision Handling Serial AER Weekly Questions

Lecture 5: Neuromorphic Communication 3

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Address Event Representation: Basic Idea

Trading in parallelism for speed

demultiplexer multiplexer multiplexer demultiplexer 1 2 3 2 2 1 3 2 1 1 2 3

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4 Phase Handshake

Asynchronous Communication

/REQ /ACK DATA t t t t t

1 2 3 4 5

valid t6

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Content

The AER protocol Collision Handling Serial AER Weekly Questions

Lecture 5: Neuromorphic Communication 6

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Full Arbitration (1/3)

two input greedy arbiter

req0 ack0 ack1 req1 req ack

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Full Arbitration (2/3)

Glitch free two input greedy arbiter

req0 ack0 ack1 req1 req ack

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Full Arbitration (3/3)

8 input arbiter binary tree

req1 ack1 req0 ack0 req ack req1 ack1 req0 ack0 req ack req1 ack1 req0 ack0 req ack req1 ack1 req0 ack0 req ack req1 ack1 req0 ack0 req ack req1 ack1 req0 ack0 req ack req1 ack1 req0 ack0 req ack req7 ack7 req6 ack6 req5 ack5 req4 ack4 req3 ack3 req2 ack2 req1 ack1 req0 ack0

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Discarding

Error detection encoding and collision discarding

I 0011 I 0101 I 0110 I 1001 I 1010 I 1100 Vbias bit 0 bit 1 bit 2 bit 3

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Age versus Loss Trade Off

A tunable compromise

pulse generators ramp generators reset by time-out

r acknowledge

winner take all encoder 2

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Content

The AER protocol Collision Handling Serial AER Weekly Questions

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High Speed LVDS Serial AER

+ compact connector + high speed (∼ 100Mevents/s) + flexible word length

synchronous
power hungry (relatively)

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Content

The AER protocol Collision Handling Serial AER Weekly Questions

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Weekly Questions

1. How do you imagine a non-greedy arbiter is supposed

to work as opposed to the greedy arbiter in the script? Would you be able to draw a signal timing diagram in an interesting case?

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