PCB Recommendations

The routing board signals from FPGA to QDR II+ or QDR II+ Extreme devices, adhere to the constraints mentioned in the following tables.

Table 1. Maximum Length and Delay Constraints
Signal Maximum Length (inches) Routing Delay (ns)
Address and Command 6.0 1
Data 6.0 1
Table 2. Skew Constraints
Signal Skew Constraints
Data to Clock

(D to K and Q to CQP)

±25 ps
Data Bus (D or Q) ±25 ps
Address and Command ±25 ps
Address, Command and to Clock (KP) ±25 ps
KP to KN ±10 ps