Configuration Handbook - Kamami.pl

JTAG ConfigurationDuring JTAG configuration, data can be downloaded to the device on thePCB through the USB Blaster, MasterBlaster, ByteBlaster II, orByteBlasterMV header. Configuring devices through a cable is similar toprogramming devices in-system, except the TRST pin should beconnected to V CC . This ensures that the TAP controller is not reset.Figure 6–29. shows JTAG configuration of a single APEX II device.Figure 6–29. JTAG Configuration of a Single Device Using a Download CableVCC (1)(1) VCC(1) VCC 1 kΩ1 kΩGND N.C.APEX II DevicenCE (4)TCKnCE0TDO1 kΩVCC (1)1 kΩ(2)(2)(2)nSTATUSCONF_DONEnCONFIGMSEL0MSEL1TMSTDITRSTVCCDownload Cable10-Pin Male Header(JTAG Mode)(Top View)Pin 1VCCGNDVIO (3)1 kΩGNDGNDNotes to Figure 6–29:(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) The nCONFIG, MSEL0, and MSEL1 pins should be connected to support a non-JTAG configuration scheme. If onlyJTAG configuration is used, connect nCONFIG to V CC , and MSEL0 and MSEL1 to ground.(3) Pin 6 of the header is a VIO reference voltage for the MasterBlaster output driver. VIO should match the device’sV CCIO . Refer to the MasterBlaster Serial/USB Communications Cable Data Sheet for this value. In theByteBlasterMV, this pin is a no connect. In the USB Blaster and ByteBlaster II, this pin is connected to nCE when itis used for Active Serial programming, otherwise it is a no connect.(4) nCE must be connected to GND or driven low for successful JTAG configuration.To configure a single device in a JTAG chain, the programming softwareplaces all other devices in BYPASS mode. In BYPASS mode, devices passprogramming data from the TDI pin to the TDO pin through a singlebypass register without being affected internally. This scheme enables theprogramming software to program or verify the target device.Configuration data driven into the device appears on the TDO pin oneclock cycle later.6–58 Altera CorporationConfiguration Handbook, Volume 1 August 2005