收藏本站
Clear Pin
Set Pin
Initialize
Memory
Forces the
selected
user I/O pin
low
Forces the
selected
user I/O pin
high
Initializes
DDR2
0
1
0
1
0
0x40
0x00
–
0x3E
0x41
0x00
–
0x3E
0x70
Clear Pin Command
The user I/O pin numbers are described in Table 2.
User I/O pin 0xnn is cleared. The specified user I/O
number is returned.
Set Pin Command
The user I/O pin numbers are described in Table 2.
User I/O pin 0xnn is set. The specified user I/O number
is returned.
The Initialize Memory Command configures the DDR2
SDRAM for access by the FPGA. The memory cannot
SDRAM
be accessed without being initialized .
Important Note on DDR2 SDRAM Data Access:
DDR2 SDRAM data accesses using the reference design on the DLP-HS-FPGA module are always
performed 4 bytes at a time due to the fact that the device is configured for a burst length of four.
What this means is that column address Bits 0 and 1 only change the order of the read or write bytes;
they still refer to the same 4 bytes. Therefore, to increment the DDR2 SDRAM address for
consecutive memory locations, the column address must be incremented by 4 .
Incrementing the column address by anything less than 4 simply changes the order in which the 4
bytes specified by column address 9:3 are written to the memory or returned to the user. For example,
a write to a column starting address of 0 will write to column locations 0, 1, 2 and 3. But if the user
then writes to column address 1, they will actually be writing to column locations 1, 2, 3 and 0, which
will overwrite the previous write operation.
More details on how the DDR2 SDRAM column bits 1 and 0 function can be found in Figure 4 and
Table 40 of the Micron? MT47H32M8 datasheet. For details on how the bank, row and column bits
are sent via USB to the memory, refer to the commands below:
Memory
Read
Reads 4
bytes from
0
0x8n
Reads 4 bytes from the DDR2 SDRAM starting with the
address specified. The command byte is OR’d with the
the DDR
SDRAM
Most Significant Row Address Bit (24).
n = 0 the Most Sig Row Address Bit is low (0x80)
n = 1 the Most Sig Row Address Bit is high (0x81)
1
2
3
0xah
0xam
0xal
Bits 23-16 Middle 8 bits of Row Address to be read from
Bits 15-12 Lower 4 bits of Row Address to be read from
Bits 11-8 Upper 4 bits Column Address to be read from
Bits 7-2: Lower 6 bits of Column Address to be read
from
NOTES: Refer to the text above regarding Column Bits
1 and 0 (equates to 0xal bits 3-2). Bits 1-0: Bank
Address to be read from.
If the memory has not been initialized, the data returned
will be invalid, and the command returned will be 0xE7
indicating the error.
Rev. 1.7 (May 2011)
11
? DLP Design, Inc.
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
DLP-IOR4 MODULE LATCHING-RELAY 4-CH
DLP-TEMP-G MODULE DATA-ACQUISITION 3-CH
DLP-TXRX-G MODULE USB-TO-TTL SRL UART CONV
DLP-USB1232H MODULE USB-TO-UART/FIFO HS 18DIP
DLP-USB232M-G MODULE USB-TO-TTL SRL UART CONV
DLP-USB232R MODULE USB-TO-SRL UART 18-DIP
DLP-USB245M-G MODULE USB-TO-TTL PARL FIFO CONV
DLP-USB245R MODULE USB-TO-PARL FIFO 18-DIP
相关代理商/技术参数
DLP-HS-FPGA3 功能描述:可编程逻辑 IC 开发工具 USB-to-FPGA Development Module RoHS:否 制造商:Altera Corporation 产品:Development Kits 类型:FPGA 工具用于评估:5CEFA7F3 接口类型: 工作电源电压:
DLP-HS-FPGA-A 功能描述:FPGA Embedded Module Spartan-3A, XC3S200A FT2232H 66MHz 32MB 制造商:dlp design inc. 系列:FPGA 零件状态:有效 模块/板类型:FPGA，USB ?? 核心处理器:Spartan-3A，XC3S200A 协处理器:FT2232H 速度:66MHz 闪存大小:- RAM 容量:32Mb 连接器类型:USB - B，引脚接头 大小/尺寸:3" x 1.2"（76.2mm x 30.5mm） 工作温度:0°C ~ 70°C 标准包装:1
DLP-IO14 功能描述:数据记录与采集 14-Channel Data-Acq Module RoHS:否 制造商:Lantronix 描述/功能:Analog device server 显示器类型:None 电流额定值:
DLP-IO16 功能描述:界面模块 USB/Micro Dev Board RoHS:否 制造商:4D Systems 产品:Serial Converters 通道/端口数量: 数据速率: 接口类型:USB, UART 工作电源电压:3.3 V, 5 V 最大工作温度:
DLP-IO20 功能描述:数据记录与采集 USB-BASED 20-CHANNEL DATA ACQUISITION MOD RoHS:否 制造商:Lantronix 描述/功能:Analog device server 显示器类型:None 电流额定值:
DLP-IO26 功能描述:开发板和工具包 - PIC / DSPIC USB/Micro Dev Board RoHS:否 制造商:Microchip Technology 产品:Starter Kits 工具用于评估:chipKIT 核心:Uno32 接口类型: 工作电源电压:
DLP-IO8 功能描述:界面模块 USB-BASED 8-CHANL DATA ACQUSITION MODL RoHS:否 制造商:4D Systems 产品:Serial Converters 通道/端口数量: 数据速率: 接口类型:USB, UART 工作电源电压:3.3 V, 5 V 最大工作温度:
DLP-IO8-G 功能描述:数据记录与采集 USB-BASED 8-CHANL DATA ACQUSITION MODL RoHS:否 制造商:Lantronix 描述/功能:Analog device server 显示器类型:None 电流额定值: