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Circuit converting SRAM interface to SDRAM interface and converting method

A conversion method and interface transfer technology, applied in the fields of electrical digital data processing, static memory, instruments, etc., can solve the problem of high price of SRAM, and achieve the effect of simple and reliable implementation, lower power consumption, and lower cost.

Active Publication Date: 2009-02-11
WINGTECH COMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The biggest disadvantage of SRAM is that it is expensive. The price of SRAM with the same capacity is about ten times that of SDRAM.

Method used

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  • Circuit converting SRAM interface to SDRAM interface and converting method
  • Circuit converting SRAM interface to SDRAM interface and converting method
  • Circuit converting SRAM interface to SDRAM interface and converting method

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Embodiment Construction

[0059] The specific implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings and examples, but the protection scope of the present invention should not be limited thereby.

[0060] Table 1 is a truth table for SDRAM operation. The timing of SDRAM requires complete operation as shown in Table 1. The method of the present invention does not fully realize the operations listed in Table 1 in order to save logic units of the CPLD.

[0061] The logical operations implemented by this method are as follows:

[0062] ①Precharge all Banks: precharge all data blocks

[0063] ②Mode register set: Set the relevant parameters of SDRAM according to the frequency and address range of CLOCK.

[0064] ③Bank Active: According to the address bus, activate the relevant block.

[0065] ④ Read

[0066] ⑤ Write

[0067] ⑥Precharge Selected Bank

[0068] ⑦Clock suspend clock suspend

[0069] ⑧Auto Refresh

[0070] ⑨N...

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Abstract

The invention discloses a circuit for switching a synchronous random access memory (SRAM) interface to a synchronous dynamic random access (SDRAM) interface and a switch method thereof. The switching circuit comprises a central processing unit (CPU), a complex programmable logic device (CPLD) and a SDRAM chip. The CPU has an SRAM interface, the WE end, the RE end, the CS end and the address (ADDR) end of the SRAM interface are respectively connected with the corresponding signal ends of the CPLD, and the data signal end DATA of the CPU is connected with the data signal end DATA of the SDRAM chip. The row address strobe (RAS) signal, the column address strobe (CAS) signal, the second write control end WE2, block address signal end BANK, the second address (ADDR2) signal end and the clock enable (CKE) signal of the CPLD are respectively connected with the corresponding signal ends of the SDRAM chip. The circuit is used in a handheld terminal to switch the SRAM interface to the SDRAM interface, and the CPU can read, write and carry out other operations to the SDRAM via an SRAM bus interface.

Description

technical field [0001] The invention relates to a synchronous dynamic memory (Synchronous Dynamic Random Access Memory, referred to as SDRAM), in particular to a circuit and a conversion method for converting a synchronous static memory (Synchronous Random Access Memory, referred to as SRAM) interface to an SDRAM interface. Background technique [0002] With the development of chip technology and the wide application of PC, the price of SDRAM is getting lower and lower. At the same time, the applications of handheld terminals are becoming more and more abundant, the volume of handheld terminal software is becoming larger and larger, and the requirements for memory are also increasing. [0003] The biggest disadvantage of SRAM is that it is expensive, and the price of SRAM with the same capacity is about ten times that of SDRAM. Therefore, how to replace SRAM with SDRAM to reduce the cost of terminal equipment has become an urgent problem to be solved. Contents of the inve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11C7/10G11C11/34G06F13/00
Inventor 石武
Owner WINGTECH COMM
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