CN104331251A

CN104331251A - Function expansion method of DRAM (Dynamic Random Access Memory) data mask bit

Info

Publication number: CN104331251A
Application number: CN201410522232.3A
Authority: CN
Inventors: 亚历山大
Original assignee: Shandong Sinochip Semiconductors Co Ltd
Current assignee: Xian Unilc Semiconductors Co Ltd
Priority date: 2014-09-30
Filing date: 2014-09-30
Publication date: 2015-02-04

Abstract

The invention provides a function expansion method of a DRAM (Dynamic Random Access Memory) data mask bit. When DRAM reading operation is carried out, a data mask bit of writing operation is used for generating a data path flipping bit (DBI) in the reading operation process; XOR calculation is carried out on data to be read by the DBI bit and a finally-read data output is formed, so that an output eye pattern of a DRAM is improved by reducing the possibility of data flipping, peak value current is reduced during the DRAM reading operation, and furthermore, the system noises are reduced.

Description

A kind of method for developing functions of DRAM data mask bit

Technical field

The present invention relates to semiconductor memory field, be specifically related to a kind of method for developing functions of DRAM data mask bit.

Background technology

Along with in internal memory operation, data bits is more and more wider, the passage of synchronization system generation Data flipping also can get more and more, this can cause system to need to provide more stable environment to go to guarantee that these high-speed turnovers can successfully complete, and each upset of data channel all can produce peak point current, cause system power consumption large, the high-frequency upset of this data simultaneously can bring very Iarge-scale system noise to system.

As shown in Figure 1, in the write operation of high-speed DRAM, we often need to count by data mask bit (DM) data shielding our partial write, but when read operation, data mask bit (DM) is in idle state, is not fully used.

Summary of the invention

The object of the invention is to overcome prior art defect, a kind of method for developing functions of DRAM data mask bit is provided, produce peak point current when data path flip bit (DBI) reduces DRAM read operation by the multiplexing data mask bit (DM) writing path, thus reduce system noise.

For achieving the above object, the present invention by the following technical solutions:

A kind of method for developing functions of DRAM data mask bit, when carrying out DRAM read operation, utilize the data mask bit of write operation to produce the data path flip bit (DBI) during read operation, carry out XOR calculating by DBI position and the data that will read, export as the final data read.

As further prioritization scheme: judge that the data of the data and final reading will carrying out read operation need to overturn the quantity of passage, when needing the quantity overturning passage to be greater than 1/2 of read operation data channel quantity, it is 1 that data path flip bit (DBI) exports, otherwise output is 0.

As further prioritization scheme: every 8 bit data of read operation data introduce 1 data path flip bit (DBI).

The present invention utilizes the data mask bit of existing write operation to produce DBI position during DRAM read operation, XOR calculating is carried out by DBI position and the data that will read, export as the final data read, with the output eye pattern of the probability thus lifting DRAM that reduce Data flipping generation.

Accompanying drawing explanation

Fig. 1 is the schematic diagram carrying out shielding write data in the write operation of DRAM by data mask bit;

Utilize data mask bit to produce the schematic diagram of data path flip bit when Fig. 2 is read operation of the present invention.

Embodiment

Below in conjunction with accompanying drawing the present invention done and more at large describe.

When internal memory read operation, utilize the data mask bit of write operation to produce the data path flip bit (DBI) during read operation, carry out XOR by DBI position and the data that will read to calculate and output data are carried out DBI algorithm and transform and export, export as the final data read, DBI information is exported by DM passage simultaneously.

Further, first judge that the data of the data and final reading will carrying out read operation need to overturn the quantity of passage, when needing the quantity overturning passage to be greater than 1/2 of total data number of channels, it is 1 that data path flip bit (DBI) exports, otherwise exporting is 0, undertaken exporting after XOR calculates by DBI position and the data that will read.

As shown in Figure 2, when carrying out read operation, every 8 bit data introduce 1 data path flip bit (DBI), when 8 bit data attempt being turned to 11111111 from 00000000 time, introduce 1 DBI position, carry out XOR calculating by the data that will read and DBI position, all passages all need not overturn, the data needing to export can be obtained, thus upset figure place is reduced.The peak point current reduction 30-40% of read operation can be made, thus reduce system noise.

Claims

1. the method for developing functions of a DRAM data mask bit, it is characterized in that: when carrying out DRAM read operation, utilize the data mask bit of write operation to produce the data path flip bit (DBI) during read operation, carry out XOR calculating by DBI position and the data that will read, export as the final data read.

2. the method for developing functions of DRAM data mask bit according to claim 1, it is characterized in that: the data of the data and final reading that judge to carry out read operation need to overturn the quantity of passage, when needing the quantity overturning passage to be greater than 1/2 of read operation data channel quantity, it is 1 that data path flip bit (DBI) exports, otherwise output is 0.

3. the method for developing functions of DRAM data mask bit according to claim 1, is characterized in that: every 8 bit data of read operation data introduce 1 data path flip bit (DBI).