Configuration Handbook - Kamami.pl

Device Configuration PinsTable 13–12. Dedicated JTAG PinsPin NameUserModePin Type DescriptionTDI N/A Input Serial input pin for instructions as well as test and programming data. Data isshifted in on the rising edge of TCK. If the JTAG interface is not required on theboard, the JTAG circuitry can be disabled by connecting this pin to V CC . This pinuses Schmitt trigger input buffersTDO N/A Output Serial data output pin for instructions as well as test and programming data. Datais shifted out on the falling edge of TCK. The pin is tri-stated if data is not beingshifted out of the device. If the JTAG interface is not required on the board, theJTAG circuitry can be disabled by leaving this pin unconnected.TMS N/A Input Input pin that provides the control signal to determine the transitions of the TAPcontroller state machine. Transitions within the state machine occur on the risingedge of TCK. Therefore, TMS must be set up before the rising edge of TCK. TMSis evaluated on the rising edge of TCK. If the JTAG interface is not required onthe board, the JTAG circuitry can be disabled by connecting this pin to V CC . Thispin uses Schmitt trigger input buffersTCK N/A Input The clock input to the BST circuitry. Some operations occur at the rising edge,while others occur at the falling edge. If the JTAG interface is not required on theboard, the JTAG circuitry can be disabled by connecting this pin to ground. Thispin uses Schmitt trigger input buffers13–50 Altera CorporationCyclone Device Handbook, Volume 1 January 2007