Enhanced Configuration (EPC) Devices Datasheet

ID 683253
Date 5/04/2016
Public

1.8. IEEE Std. 1149.1 (JTAG) Boundary-Scan

The EPC device provides JTAG BST circuitry that complies with the IEEE Std. 1149.1-1990 specification. JTAG BST can be performed before or after configuration, but not during configuration.

Figure 6. JTAG Timing Waveforms
Table 12.  JTAG Timing Parameters and Values
Symbol Parameter Min Max Unit
tJCP TCK clock period 100 ns
tJCH TCK clock high time 50 ns
tJCL TCK clock low time 50 ns
tJPSU JTAG port setup time 20 ns
tJPH JTAG port hold time 45 ns
tJPCO JTAG port clock output 25 ns
tJPZX JTAG port high impedance to valid output 25 ns
tJPXZ JTAG port valid output to high impedance 25 ns
tJSSU Capture register setup time 20 ns
tJSH Capture register hold time 45 ns
tJSCO Update register clock to output 25 ns
tJSZX Update register high-impedance to valid output 25 ns
tJSXZ Update register valid output to high impedance 25 ns