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DDR_SDRAM_controller
- DDR SDRAM控制器的VHDL源代码，含详细设计文档。 The DDR, DCM, and SelectI/O™ features in the Virtex™ -II architecture make it the perfect choice for implementing a controller of a Double Data Rate (DDR) SDRAM. The Digital Clock Manager (DCM) provides t
wtut_sc
- DCM includes a clock delay locked loop used to minimize clock skew for Spartan-3, Virtex-II, Virtex-II Pro, and Virtex-II Pro X devices. DCM synchronizes the clock signal at the feedback clock input (CLKFB) to the clock signal at the input clock
stoppsignal
- A VHDL module that counts long pulses on the inport counting rising edges.
I2C_vhdl
- IMPORTANT NOTE: This design uses the I2C SCL signal as a clock. This requires that the SCL signal have clean, fast edges on both the rising and falling edges of this signal. Slow rise and fall times on this signal can show noise effects whic
DATA_SAMPLE
- 运用VHDL实现双时钟沿的数据采集（上升沿和下降沿同时采集）-The use of VHDL data acquisition (rising and falling edges of the dual clock edge Acquisition)
easyDerivator
- Easy derivator circuit, detects rising and falling edges of single signal.
QDEC
- 旋转编码器的正交解码程序，使用VHDL语言--- This decoder in VHDL samples the signals using all four available edges of -- A and B. E.g. sample(B) on rising(A), sample(A) on falling(B), sample(B) on -- falling(A), and sample(A) on rising(B).
i2cBUS
- Altera的I2C总线FPGA程序，内有详细使用说明- The I2C Controller is available in VHDL and is optimized for the Altera® APEX™ , Stratix® , and Cyclone™ device families. All of the register addresses are defined as constants in the VHDL source