Read delivery for memory subsystem with narrow bandwidth repeater channel

Abstract

A system with memory includes a repeater architecture where the memory connects to a host with one bandwidth, and a repeater extends a channel with a lower bandwidth. A memory circuit includes a first group of memory devices coupled point-to-point to a host device via a first group of read signal lines. The memory circuit includes a second group of memory devices coupled point-to-point to the first group of memory devices second group of read signal lines to extend the memory channel to the second group of memory devices. The second group of read signal lines has fewer read signal lines than the first group. The memory circuit includes a repeater to share read bandwidth between the first and second groups of memory devices, with up to a portion of the bandwidth for reads to the second group of memory devices, and at least an amount equal to the bandwidth less the portion for reads to the first group of memory devices. The repeater or buffer may accumulate data read from the second group of memory devices or a second memory module and burst the accumulated data to the host device with the first bandwidth.