Self-adaptive read path delay calculation method and circuit for DRAM physical interface

Abstract

The invention discloses a self-adaptive read path delay calculation method and circuit for a DRAM physical interface. The method comprises the following steps: inputting a read operation to a physicalinterface of a memory at a fixed moment, then monitoring a physical interface of the memory and a data port on one side of the dynamic random access memory, waiting until a corresponding signal fluctuation moment is found, and locking a time difference. Read data delay calculation can be realized, and read path delay calculation is simplified.

Description

technical field [0001] The invention relates to the field of memory testing, in particular to an adaptive read path delay calculation method and circuit for a DRAM physical interface. Background technique [0002] As a standard physical interface layer, the memory physical interface (Memory PHY or PHY) plays an important role as a bridge between the memory controller (MC Memory Control) and the dynamic random access memory (DRAM), ensuring that the memory and the controller ( Memory controller) Reliability and feasibility of two-way transmission of control signals and read / write data signals and clock signals: [0003] The following is an introduction to the transmission direction of data or commands: [0004] 1. Memory Controller (MC)→Dynamic Random Access Memory (DRAM): [0005] That is, the memory controller sends signals such as commands to the DRAM. [0006] The memory controller obtains the operation information and address of the SOC System On Chip system for the D...

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Problems solved by technology

[0026] However, this method has limitations. For other DRAMs with different standard interfaces (for example: DDR2 / DDR / SDR DRAM), the MPR function is not available. Therefore, for the application of this type of DRAM, there is no similar Method to perform read data latency calculation

Therefore, when the DRAM chip without the MPR function is working, there are still limitations on how to accurately calculate the return time of the read data

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