ddr1 sdram

Author: Tian kaiwenDate: 2011-6-6 14:59:16PS: I will summarize it for future reference. If it is reproduced, please indicate the sourceQQ: 1324343063 Recently, we have analyzed the cpu_init.s of 6410 in uboot. This is the configuration of DDR. Because DDR is an update of SDRAM, we will first look at the SDRAM. The following is a recent summary. See: This is 64 m (32 m + 32 m), the principle of

1. Brief DescriptionThe debugging and Flash burning functions of JLink are powerful, but it is difficult to perform Flash operations on S3C2410 and S3C2440: You need to set SDRAM when burning or Flash; otherwise, the speed is very slow; burning and writing Nand Flash can only be achieved theoretically, but no one has implemented it directly.In this article, an indirect method is used to burn or write non-Nand Flash on the S3C2410 and S3C2440 developme

Diy_de2 uses two 64 Mbit SDRAM memory. The read and write operations of the SDRAM are complex. The operations can be divided into hardware debugging and software debugging. Debugging environment: Quartus II 9.0 + niosii 9.0 1. hardware debugging This part uses the SDRAM test routines of port 4 and Port 2 on the network, but there is a problem that cannot be ex

about the SRAM , DRAM , SDRAMSRAM : Static random memory, do not need to refresh the circuit, which makes static RAM faster than dynamic RAM, but, because he contains more devices, low integration, not suitable for large capacity of memory, generally used in the processor's cache, SRAM speed is very fast, In the fast read and refresh to ensure data integrity, SRAM circuit structure is very complex, the production of the same capacity SRAM than the cost of DRAM is much higher, because of this, so

After using SDRAM, SDRAM may be used as a data area. If the SDRAM is partitioned into a data area, it must be initialized before calling the main function if the file is distributed in a decentralized manner. Otherwise, Hardfault_handler will appear. Because the address in the SDRAM is used, and the

Abstract The problem of capacity calculation is encountered when debugging the SDRAM using the nio ii. The following is an introduction: Introduction Question 1: What are dram, SRAM, and SDRAM? A: The terms are explained as follows: DRAM -------- the dynamic access device immediately. data can be stored only after constant refreshing, and the row and column addresses are reused. Many of them have p

This article is reproduced in: Workshop. Abstract The problem of capacity calculation is encountered when debugging the SDRAM using the nio ii. The following is an introduction: Introduction Question 1: What are dram, SRAM, and SDRAM?A: The terms are explained as follows:DRAM -------- the dynamic access device immediately. data can be stored only after constant refreshing, and the row and column addres

Summary 1. The burst mode of SDRAMSDRAM is a command-type action device. If only one read/write data is available, you must first run the command to use it. To increase work efficiency, a command is generated to send, the mode of writing multiple data. This is the burst mode. Burst mode is a high-speed read/write mode that uses the internal column address generator. As long as you set the initial column address, the subsequent address can be automatically generated through the internal column a

// ================================================ ========================================// Title:// Judge the size of the SDRAM// Author:// Norains// Date:// Saturday 31-may-2008.// Environment:// None// ================================================ ======================================== How can we determine the size of sdramcapacity if we only give the pin of the SDRAM without any additional infor

This article reprinted to: http://blog.ednchina.com/ilove314/955999/message.aspx Quartus II handbook version 9.0 Volume 5: Section I 1 in Embedded peripherals. the SDRAM controller core section describes how to estimate the effective signal window of the SDRAM data and provides an estimation formula for the phase shifting between the SDRAM clock and the FPGA clo

SDRAM Chip Explanation:Address: Line Address (A0-A12) column address (A0-A8) chip selection signal (BA0 BA1) (L-bank) (because SDRAM has 4 pieces)The only difference between the two SDRAM connections is the UDQM LDQMDQM0---tablets 1 ldqmDQM1----Tablets 1 UDQMDQM2----Tablets 2 LDQMDQM3---tablets 2 udqm————————————————————————————————————————————————————————————1,

Code relocation (nand-> sdram) and- This article only discusses the code re-location process for starting u-boot from nand flash Refer: 1) "USER's MANUAL-S3C6410X" Chapter 2 memory map Chapter 8 NAND FLASH CONTROLLER 2) u-boot source code: U-boot-x.x.x/board/samsumg/smdk6410/lowlevel_init.S U-boot-x.x.x/cpu/89c64xx/start. S U-boot-x.x.x/cpu/89c64xx/nand_cp.c Brief description of code relocation process Since Code cannot be run in nand flash, when the

Analysis on the connection between S3C2440 and SDRAM addresses -------------------------------------------------------------------------------- This article describes the Connection Analysis Between S3C2440 and SDRAM addresses. S3C2440 has 27 address lines ADDR [26:0], 8 chip selection signal ngcs0-ngcs7, corresponding to the bank0-bank7, when accessing bankx address space, ngcsx pin for low level, select p

I have never been clear about the difference between flash and Rom and Ram, today I have nothing to do, reproduced an article; http://blog.chinaunix.net/space.php? Uid = 22342666 Do = Blog id = 1774747 Common memory concepts: Ram, SRAM, SDRAM, Rom, EPROM, EEPROM, and Flash memory can be divided into many types, including RAM (Random Access Memory) based on whether power loss data is lost) and Rom (read-only memory), where Ram access speed is relativ

Rom and RAM are both semiconductor memory, Rom is short for read only memory, and Ram is short for random access memory. ROM can still maintain data when the system stops power supply, while Ram usually loses data after power loss. A typical Ram is the computer memory.Ram has two categories: static RAM (static RAM/SRAM ), The fast speed of SRAM is the fastest read/write storage device. But it is also very expensive, so it is only used in demanding places, such CPU Level 1 buffer, level 2 buffer.

SDRAM synchronizes Dynamic Random Access Memory. Synchronization refers to the step clock required for memory operations. Internal Command sending and data transmission are based on it; dynamic means that the storage array needs to be constantly refreshed to ensure that data is not lost. Random means that the index data is not stored in a linear order, but is read and written by the specified address.SRAM is short for static RAM. It is a type of memor

The assembler code primarily initializes some registers, shuts down the dog, initializes the clock, initializes the storage Manager to access the memory, and then copies the 4k RAM data on the SOC to the SDRAM, then runs inside the SRAM, and then uses Jlinkexe to debug because the code does not run properly. Jlinkexe Specifies a command file: jlinkexe-commandfile./cmd.jlink , the Cmd.jlink file contains the following:1 R 2 0x0 3 0x0 a S 4 0x0A problem

, global variables or static variables and other resources related, but the C program is stored in the local variables in the stack, from the C program compiled from the assembly code can be seen, assembly code directly using the SP this stack register (see), so before executing the C program must be set by the assembly code first The value of the top (SP) of the stack. ( in s5pv210, because the code in the Irom is actually set up, so we do not set it is OK)Why didn't we use assembler code to se

SDRAM is the abbreviation of "Synchronous dynamic random access memory", meaning "synchronous dynamical random Memory", which is what we call "synchronous memory", which uses 168-line structure. In theory, SDRAM synchronizes with CPU frequency and shares a clock cycle. SDRAM contains two interleaved storage arrays, while the CPU accesses data from one sto

If you are interested in the arm storage system or think you are familiar with it, do the following: Background: now we have an arm version that uses two 32 m-byte SDRAM with 16bits bit width to form a 32 bits bus width with a capacity of 64 MB bytes. Question 1: If the bus width is not limited to 32 bits, please draw a sketch of the 16 bits bus width, 32bits bus width, and storage capacity are 64 MB; Question 2: Which mode of high system efficienc