公开(公告)号：US20210342285A1

公开(公告)日：2021-11-04

申请号：US16863149

申请日：2020-04-30

Applicant: ADVANCED MICRO DEVICES, INC.

Inventor： SeyedMohammad SEYEDZADEHDELCHEH ,  Steven RAASCH ,  Sergey BLAGODUROV

IPC: G06F13/40 ,  H03M7/30 ,  G06F13/42

Abstract: Data are serially communicated over an interconnect between an encoder and a decoder. The encoder includes a first training unit to count a frequency of symbol values in symbol blocks of a set of N number of symbol blocks in an epoch. A circular shift unit of the encoder stores a set of most-recently-used (MRU) amplitude values. An XOR unit is coupled to the first training unit and the first circular shift unit as inputs and to the interconnect as output. A transmitter is coupled to the encoder XOR unit and the interconnect and thereby contemporaneously sends symbols and trains on the symbols. In a system, a device includes a receiver and decoder that receive, from the encoder, symbols over the interconnect. The decoder includes its own training unit for decoding the transmitted symbols.

公开(公告)号：US20210191620A1

公开(公告)日：2021-06-24

申请号：US16724609

申请日：2019-12-23

Applicant: ADVANCED MICRO DEVICES, INC.

Inventor： SeyedMohammad SEYEDZADEHDELCHEH ,  Xianwei ZHANG ,  Bradford BECKMANN ,  Shomit N. DAS

IPC: G06F3/06 ,  G06F12/0875

Abstract: In some embodiments, a memory controller in a processor includes a base value cache, a compressor, and a metadata cache. The compressor is coupled to the base value cache and the metadata cache. The compressor compresses a data block using at least a base value and delta values. The compressor determines whether the size of the data block exceeds a data block threshold value. Based on the determination of whether the size of the compressed data block generated by the compressor exceeds the data block threshold value, the memory controller transfers only a set of the compressed delta values to memory for storage. A decompressor located in the lower level cache of the processor decompresses the compressed data block using the base value stored in the base value cache, metadata stored in the metadata cache and the delta values stored in memory.