Libraries GuideChapter 10: Design Elements (SOP3 to XORCY_L)
TDI
Boundary Scan Test Data 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 TDI input pad is connected to the boundary scan TDI input. It loads instructions and data on the Low-to-High TCK transition. The function of the TDI pad is device configuration dependent and can be used as follows.
- During configuration, TDI is connected to the boundary scan logic.
- After configuration, if boundary scan is not used, the TDI pad is unrestricted and can be used by the routing tools as an input/output pad.
- After configuration, if boundary scan is used, the TDI pad can be used for user-logic input by connecting the TDI pad directly to the user logic.
