SSTL18_I, DIFF_SSTL18_I

UltraScale Architecture SelectIO Resources User Guide (UG571)

Document ID
UG571
Release Date
2023-08-31
Revision
1.15 English
Table 1-39: Available I/O Bank Type

HR

HP

Available

Available

Class-I drivers can be preferred for short, point-to-point board topologies. Parallel end-termination resistors (commonly 50 ) to V TT = (V CCO /2) are typically placed on the board close to any receiver. Optional untuned split input ODT provides Thevenin equivalent resistance of R (where R = Z 0 ) to the V CCO /2. The untuned on-die source termination feature (OUTPUT_IMPEDANCE) provides the option of 40 , 48 , or 60 of driver impedance in HP I/O banks. The driver output impedance is set to a default of 40 . The differential (DIFF_) version uses complementary single-ended drivers for outputs, and differential receivers for inputs.