Libraries GuideChapter 10: Design Elements (SOP3 to XORCY_L)
TCK
Boundary Scan Test Clock Input Pad
XC3000
| XC4000E
| XC4000X
| XC5200
| XC9000
| Spartan
| SpartanXL
| Spartan2
| Virtex
|
|---|
N/A
| Primitive
| Primitive
| Primitive
| N/A
| Primitive
| Primitive
| N/A
| N/A
|
The TCK input pad is connected to the boundary scan test clock, which shifts the serial data and instructions into and out of the boundary scan data registers. The function of the TCK pad is device configuration dependent and can be used as follows.
- During configuration TCK is connected to the boundary scan logic.
- After configuration, if boundary scan is not used, the TCK pad is unrestricted and can be used by the routing tool as an input/output pad.
- After configuration, if boundary scan is used, the TCK pad can be used for user-logic input by connecting it directly to the user logic.
