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− | {{amd title|Infinity Fabric (IF)}} | + | {{amd title|Infinity Fabric (IF)}}[[File:amd infinity fabric.svg|right|250px]] |
− | '''Infinity Fabric''' ('''IF''') is a | + | '''Infinity Fabric''' ('''IF''') is a system [[interconnect architecture]] that facilitates data and control transmission accross all linked components. This architecture is utilized by [[AMD]]'s recent microarchitectures for both CPU (i.e., {{amd|Zen|l=arch}}) and graphics (e.g., {{amd|Vega|l=arch}}), and any other additional accelerators they might add in the future. The fabric was first announced and detailed in April 2017 by Mark Papermaster, AMD's SVP and CTO. |
== Overview == | == Overview == | ||
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The Infinity Fabric consists of two separate communication planes - Infinity '''Scalable Data Fabric''' ('''SDF''') and the Infinity '''Scalable Control Fabric''' ('''SCF'''). The SDF is the primary means by which data flows around the system between endpoints (e.g. [[NUMA node]]s, [[PHY]]s). The SDF might have dozens of connecting points hooking together things such as [[PCIe]] PHYs, [[memory controller]]s, USB hub, and the various computing and execution units. The SDF is a [[superset]] of what was previously [[HyperTransport]]. The SCF is a complementary plane that handles the transmission of the many miscellaneous system control signals - this includes things such as thermal and power management, tests, security, and 3rd party IP. With those two planes, AMD can efficiently scale up many of the basic computing blocks. | The Infinity Fabric consists of two separate communication planes - Infinity '''Scalable Data Fabric''' ('''SDF''') and the Infinity '''Scalable Control Fabric''' ('''SCF'''). The SDF is the primary means by which data flows around the system between endpoints (e.g. [[NUMA node]]s, [[PHY]]s). The SDF might have dozens of connecting points hooking together things such as [[PCIe]] PHYs, [[memory controller]]s, USB hub, and the various computing and execution units. The SDF is a [[superset]] of what was previously [[HyperTransport]]. The SCF is a complementary plane that handles the transmission of the many miscellaneous system control signals - this includes things such as thermal and power management, tests, security, and 3rd party IP. With those two planes, AMD can efficiently scale up many of the basic computing blocks. | ||
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== Scalable Data Fabric (SDF) == | == Scalable Data Fabric (SDF) == | ||
[[File:amd zeppelin sdf plane block.svg|class=wikichip_ogimage|400px|right]] | [[File:amd zeppelin sdf plane block.svg|class=wikichip_ogimage|400px|right]] | ||
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=== SerDes === | === SerDes === | ||
− | + | The Infinity Scalable Data Fabric (SDF) employees two different types of [[SerDes]] links - '''Infinity Fabric On-Package''' ('''IFOP''') and '''Infinity Fabric InterSocket''' ('''IFIS'''). | |
− | The Infinity Scalable Data Fabric (SDF) | ||
==== IFOP ==== | ==== IFOP ==== | ||
− | The | + | The Infinity Fabric On-Package (IFOP) SerDes deal with die-to-do communication in the same package. AMD designed a fairly straightforward custom SerDes suitable for short-in package trace lengths which can achieve a power efficiency of roughly 2 pJ/b. This was done by using a 32-bit low-swing [[single-ended]] data transmission with differential clocking which consumed roughly half the power of an equivalent differential drive. They utilize a zero-power driver state from the TX/RX impedance termination to the ground while the driver pull-up is disabled. This allows transmitting zeros with less power than transmitting ones which of was also leveraged for when the link was idle. Additionally, [[inversion encoding]] was also used in order to save another 10% average power per bit. |
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− | + | == Scalable Control Fabric (SDF) == | |
− | + | The Infinity Scalable Control Fabric (SCF) is the control communication plane of the Infinity Fabric. | |
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== References == | == References == | ||
* AMD Infinity Fabric introduction by Mark Papermaster, April 6, 2017 | * AMD Infinity Fabric introduction by Mark Papermaster, April 6, 2017 | ||
* AMD EPYC Tech Day, June 20, 2017 | * AMD EPYC Tech Day, June 20, 2017 | ||
− | * | + | * ISSCC 2018 |
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