Interconnect Architectures

Concepts

Network On A Chip System Bus

General

AGP CAPI CCIX CCPI DMI (IBM) DMI (Intel) EISA Gen-Z Hydra HT IF ISA LIPINCON Micro Channel Multibus NVLink PCI PCIe PXI Q-Bus QPI S-100 SS-50 Unibus UPI VLB

Peripheral

1-Wire ACCESS.bus Centronics GPIB MIDI RS-232 RS-422 RS-423 UNI/O bus

Storage Devices

NVMe PATA SATA SATAe SSA SCSI

Audio Devices

I²S S/PDIF

Differential Memory Interface (DMI) is an IBM proprietary memory interconnect architecture that facilitates serialized, memory-agnostic, communication between a host CPU and a buffered memory chip.

Overview

The Differential Memory Interface is a proprietary interface developed by IBM designed to transport memory commands, data, and address through a high-speed SerDes from a host CPU to an OPMB-compliant memory buffer chip. DMI is a memory-agnostic interface which may be used any sort of memory by abstracting the details behind the buffer chip. DMI was first introduced with POWER8.

Implementations

Processor	POWER8	POWER9
Data Rate	9.6 GT/s	9.6 GT/s
Links	4x DMI	4x DMI
Bandwidth	28.8 GB/s	28.8 GB/s

See also

• Centaur
• Open Memory Interface