Systems and methods for transition-minimized data bus inversion

Abstract

Circuits and methods for Data Bus Inversion (DBI) are provided. In one example, the immediately previous value of the DBI bit affects the next value of the DBI bit. Specifically, in some instances, the value of the DBI bit is held to the immediately previous value of the DBI bit to limit the total number of transitions on a data bus.

Description

TECHNICAL FIELD[0001]This application relates to Data Bus Inversion (DBI), and more particularly, to systems and methods to minimize data transitions using DBI.BACKGROUND[0002]In single-ended parallel Input / Outputs (IOs) such as a Double Data Rate (DDR) transfer-mode bus, data bus inversion (DBI) is an increasingly popular coding scheme that reduces signaling power and simultaneous switching output (SSO) noise, thereby improving power and signal integrity. An example is an 8-bit data bus. In an 8-bit DBI-encoded data bus, the eight data bits are transmitted either as-is or inverted for each bit unit interval. At each bit unit interval, an extra coding overhead bit (also referred to as the DBI bit) accompanies the transmitted data bits to inform the receiver whether an intentional bus-wide inversion took place. For example, when the coding overhead bit is set to a logical one, it may indicate that the data bits of the bus are inverted. The receiver receives the data bits and the over...

AI Technical Summary

Benefits of technology

This patent describes a new way of controlling the number of Transitions (the movement of data) in a computer network. By taking into account the possibility of when a specific bit (a type of data) will change, the system can limit the number of times it does so. This results in a reduction of up to 20% in the amount of power needed for the network. This invention is useful for computer networks with a certain size and also helps to improve power integrity, which means that the network is using less power and is more reliable.

Problems solved by technology

Moreover, a large number of bit transitions may cause a phenomenon referred to as “ground bounce” or “supply bounce,” where the voltage supplied to a gate may temporarily dip and cause jitter.

Images