XM014034B datasheet(13/83 Pages) XMOS

13 / 83 page

XU6--QF6A Datasheet

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clock block

port counter

1-bit port

100MHz

reference

clock

divider

Figure :

Clock block

diagram

On reset, each port is connected to clock block , which runs from the xCORE Tile refer-

ence clock.

Channels and Channel Ends

Logical cores communicate using point-to-point connections, formed between two chan-

nel ends. A channel-end is a resource on an xCORE tile, that is allocated by the program.

Each channel-end has a unique system-wide identier that comprises a unique number

and their tile identier. Data is transmitted to a channel-end by an output-instruction;

and the other side executes an input-instruction. Data can be passed synchronously or

asynchronously between the channel ends.

6.6 xCONNECT Switch and Links

XMOS devices provide a scalable architecture, where multiple xCORE devices can be con-

nected together to form one system. Each xCORE device has an xCONNECT interconnect

that provides a communication infrastructure for all tasks that run on the various xCORE

tiles on the system.

The interconnect relies on a collection of switches and XMOS links. Each xCORE device

has an on-chip switch that can set up circuits or route data. The switches are connected

by xConnect Links. An XMOS link provides a physical connection between two switches.

The switch has a routing algorithm that supports many different topologies, including

lines, meshes, trees, and hypercubes.

The links operate in either wires per direction or wires per direction mode, depending

on the amount of bandwidth required. Circuit switched, streaming and packet switched

data can both be supported efciently. Streams provide the fastest possible data rates

between xCORE Tiles, but each stream requires a single link to be reserved between

switches on two tiles. All packet communications can be multiplexed onto a single link.

Information on the supported routing topologies that can be used to connect multiple

devices together can be found in the xCONNECT Architecture guide.

XM014034B Datasheet(PDF) 13 Page - Xmos Ltd.