参看资料：Altera官网提供的CycloneII Device Handbook和USB-Blaster Download Cable User Guide。
一、USB Female Plug Signal Name and Progrming Mode
二、JTAG Configuration of Single Device Using a Download Cable
(1) The pull-up resistor should be connected to the same supply voltage as the USB-Blaster, MasterBlaster (VIO pin),
ByteBlaster II, or ByteBlasterMV cable.
(2) Connect the nCONFIG and MSEL[1..0] pins to support a non-JTAG configuration scheme. If only JTAG
configuration is used, connect the nCONFIG pin to VCC, and the MSEL[1..0] pins to ground. In addition, pull DCLK
and DATA0 to either high or low, whichever is convenient on your board.
(3) Pin 6 of the header is a VIO reference voltage for the MasterBlaster output driver. VIO should match the device’s
VCCIO. Refer to the MasterBlaster Serial/USB Communications Cable Data Sheet for this value. In the ByteBlasterMV,
this pin is a no connect. In the USB-Blaster and ByteBlaster II, this pin is connected to nCE when it is used for AS
programming, otherwise it is a no connect.
(4) nCE must be connected to GND or driven low for successful JTAG configuration.
(5) The nCEO pin can be left unconnected or used as a user I/O pin when it does not feed other device’s nCE pin.
图1 USB-Blaster的JTAG连接
三、Single Device AS Configuration
(1) Connect the pull-up resistors to a 3.3-V supply.
(2) Cyclone II devices use the ASDO to ASDI path to control the configuration device.
(3) The nCEO pin can be left unconnected or used as a user I/O pin when it does not
feed another device’s nCE pin.
图2 USB-Blaster的ASP连接
图3 EPCS配置
图4 CycloneII配置