5.7 PCB Recommendations

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

Table 5-8. Maximum Length and Delay Constraints
Signal	Maximum Length (inches)	Routing Delay (ns)
Address and Command	6.0	1
Data	6.0	1

Table 5-9. 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

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