单片机STM32F407如何外扩SRAM存储器芯片
2017-05-25 11:55:52
在设计的过程中,我们在使用单片机STM32F407如果遇到数据内存不够使用,需要进行外扩
SRAM存储器芯片,那应该如何设置,
可以采用IS62WV51216(EM681FV16BU-55LF)的
SRAM存储器芯片作为存储的外扩芯片,
首先实现 IS62WV51216(EM681FV16BU-55LF)的访问,需要对 FSMC进行哪些配置。
以上是大概步骤的诠释:
步骤如下:
- 使能 FSMC 时钟,并配置 FSMC 相关的 IO 及其时钟使能。
在使用FSMC前,我们要先将其时钟开启。然后把 FSMC_D0~15,FSMCA0~18 等相关IO接口,通通改为复用输出的配置,最后使能各 IO 组的时钟。
使能 FSMC 时钟的方法:
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_FSMC,ENABLE);
2. 设置 FSMC BANK1 区域 3。
FSMC BANK1 区域 3已经包括设置区域 3 的SRAM存储器的位宽、工作模式和读写时序等等。我们启动使用模式 A、16 位宽,并让读写共同使用一个时序寄存器。
使用的函数是:
void FSMC_NORSRAMInit(FSMC_NORSRAMInitTypeDef* FSMC_NORSRAMInitStruct)
3. 使能 BANK1 区域 3。
使用的函数是:
void FSMC_NORSRAMCmd(uint32_t FSMC_Bank, FunctionalState NewState);
以上三个步骤,我们就完成了对FSMC的配置设置,设置完毕后就可以访问IS62WV51216(EM681FV16BU-55LF),需要注意的一点,我们选择 BANK1 的区域3使用,因此 HADDR[27:26]=10,而外部内存的首地址设置为 0X68000000。
在单片机设计de的过程中我们可以遇到不同容量的型号考虑选择,以下是同类型型号的选择,可以作为参考
Density |
Org. |
Part number |
Speed |
Package Type |
Voltage |
16Mb |
x16 |
EM6168FV16B-45LF |
45ns |
BGA 48B 8x10x1.0 |
2.7~3.6V |
16Mb |
x16 |
EM6168FV16B-55LF |
55ns |
BGA 48B 8x10x1.0 |
2.7~3.6V |
16Mb |
x16 |
EM6169FV16B-45LF |
45ns |
BGA 48B 8x10x1.0 |
2.7~3.6V |
16Mb |
x16 |
EM6169FV16B-55LF |
55ns |
BGA 48B 8x10x1.0 |
2.7~3.6V |
8Mb |
x8 |
EM680FV8BU-45LF |
45ns |
TSOPII 44L 11.76x18.41x1.2 |
2.7~3.6V |
8Mb |
x8 |
EM680FV8BU-55LF |
55ns |
TSOPII 44L 11.76x18.41x1.2 |
2.7~3.6V |
8Mb |
x8 |
EM681FV8BU-45LF |
45ns |
TSOPII 44L 11.76x18.41x1.2 |
2.7~3.6V |
8Mb |
x16 |
EM681FV8BU-55LF |
55ns |
TSOPII 44L 11.76x18.41x1.2 |
2.7~3.6V |
8Mb |
x16 |
EM681FV16BU-45LF |
45ns |
TSOPII 44L 11.76x18.41x1.2 |
2.7~3.6V |
8Mb |
x16 |
EM681FV16BU-55LF |
55ns |
TSOPII 44L 11.76x18.41x1.2 |
2.7~3.6V |
8Mb |
x8 |
EM680FV8B-45LF |
45ns |
BGA 48B 8x10x1.0 |
2.7~3.6V |
8Mb |
x8 |
EM680FV8B-55LF |
55ns |
BGA 48B 8x10x1.0 |
2.7~3.6V |
8Mb |
x16 |
EM680FV16B-45LF |
45ns |
BGA 48B 8x10x1.0 |
2.7~3.6V |
8Mb |
x16 |
EM680FV16B-55LF |
55ns |
BGA 48B 8x10x1.0 |
2.7~3.6V |
8Mb |
x16 |
EM681FV16B-45LF |
45ns |
BGA 48B 8x10x1.0 |
2.7~3.6V |
8Mb |
x16 |
EM681FV16B-55LF |
55ns |
BGA 48B 8x10x1.0 |
2.7~3.6V |
8Mb |
x8 |
EM681FV8B-45LF |
45ns |
BGA 48B 8x10x1.0 |
2.7~3.6V |
8Mb |
x8 |
EM681FV8B-55LF |
55ns |
BGA 48B 8x10x1.0 |
2.7~3.6V |
4Mb |
x16 |
EM641FV16F-45LF |
45ns |
BGA 48B 6x7x1.0 |
2.7~3.6V |
4Mb |
x16 |
EM640FV16F-55LF |
55ns |
BGA 48B 6x7x1.0 |
2.7~3.6V |
4Mb |
x8 |
EM641FT8S-55LF |
55ns |
STSOPI 32L 8x13.4 |
5V |
4Mb |
x8 |
EM641FV8FS-45LF |
45ns |
STSOPI 32L 8x13.4 |
2.7~3.6V |
4Mb |
x8 |
EM641FV8FS-55LF |
55ns |
STSOPI 32L 8x13.4 |
2.7~3.6V |
4Mb |
x16 |
EM641FV16FU-45LF |
45ns |
TSOPII 44L 11.76x18.41x1.2 |
2.7~3.6V |
4Mb |
x16 |
EM641FV16FU-55LF |
55ns |
TSOPII 44L 11.76x18.41x1.2 |
2.7~3.6V |
4Mb |
x16 |
EM643FV16FU-45LF |
45ns |
TSOPII 44L 11.76x18.41x1.2 |
2.7~3.6V |
4Mb |
x16 |
EM643FV16FU-55LF |
55ns |
TSOPII 44L 11.76x18.41x1.2 |
2.7~3.6V |
4Mb |
x16 |
EM643FV16FU-70LF |
70ns |
TSOPII 44L 11.76x18.41x1.2 |
2.7~3.6V |
4Mb |
x16 |
EM640FV16F-45LF |
45ns |
BGA 48B 6x7x1.0 |
2.7~3.6V |
4Mb |
x16 |
EM646FV16FU-45LF |
45ns |
TSOPII 44L 11.76x18.41x1.2 |
2.7~3.6V |
4Mb |
x16 |
EM646FV16FU-55LF |
55ns |
TSOPII 44L 11.76x18.41x1.2 |
2.7~3.6V |
2Mb |
x16 |
EM620FV16BU-55LF |
55ns |
TSOPII 44L 11.76x18.41x1.2 |
2.7~3.6V |
2MB |
x16 |
EM620FV16BU-45LF |
45ns |
TSOPII 44L 11.76x18.41x1.2 |
2.7~3.6V |
2Mb |
x8 |
EM620FV8BS-70LF |
70ns |
STSOPI 32L 8x13.4 |
2.7~3.6V |
2Mb |
x8 |
EM620FV8BS-45LF |
45ns |
STSOPI 32L 8x13.4 |
2.7~3.6V |
2Mb |
x8 |
EM620FV8BS-55LF |
55ns |
STSOPI 32L 8x13.4 |
2.7~3.6V |
2Mb |
x16 |
EM620FV16B-45LF |
45ns |
BGA 48B 6x7x1.0 |
2.7~3.6V |
2Mb |
x16 |
EM620FV16B-55LF |
55ns |
BGA 48B 6x7x1.0 |
2.7~3.6V |
2Mb |
x16 |
EM621FV16BU-55LF |
55ns |
TSOPII 44L 11.76x18.41x1.2 |
2.7~3.6V |
2Mb |
x16 |
EM621FV16BU-45LF |
45ns |
TSOPII 44L 11.76x18.41x1.2 |
2.7~3.6V |
2Mb |
x16 |
EM621FV16B-45LF |
45ns |
BGA 48B 6x7x1.0 |
2.7~3.6V |
2Mb |
x16 |
EM621FV16B-55LF |
55ns |
BGA 48B 6x7x1.0 |
2.7~3.6V |
2Mb |
x8 |
EM621FV8BS-55LF |
55ns |
STSOPI 32L 8x13.4 |
2.7~3.6V |
2Mb |
x8 |
EM621FV8BS-45LF |
45ns |
STSOPI 32L 8x13.4 |
2.7~3.6V |
1Mb |
x8 |
EM610FV8S-45LF |
45ns |
STSOPI 32L 8x13.4 |
2.7~3.6V |
1Mb |
x8 |
EM610FV8S-55LF |
55ns |
STSOPI 32L 8x13.4 |
2.7~3.6V |
1Mb |
x16 |
EM610FV16U-45LF |
45ns |
TSOPII 44L 11.76x18.41x1.2 |
2.7~3.6V |
1Mb |
x16 |
EM610FV16U-55LF |
55ns |
TSOPII 44L 11.76x18.41x1.2 |
2.7~3.6V |
1Mb |
x8 |
EM610FV8T-45LF |
45ns |
TSOPI 32L 8x20 |
2.7~3.6V |
1Mb |
x8 |
EM610FV8T-55LF |
55ns |
TSOPI 32L 8x20 |
2.7~3.6V |
1Mb |
x8 |
EM610FV8T-70LF |
70ns |
TSOPI 32L 8x20 |
2.7~3.6V |
1Mb |
x16 |
EM611FV16U-45LF |
45ns |
TSOPII 44L 11.76x18.41x1.2 |
2.7~3.6V |
1Mb |
x16 |
EM611FV16U-55LF |
55ns |
TSOPII 44L 11.76x18.41x1.2 |
2.7~3.6V |
1Mb |
x16 |
EM611FV16U-70LF |
70ns |
TSOPII 44L 11.76x18.41x1.2 |
2.7~3.6V |
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