Common use of Hardware Signaling Pin Timing Requirements Clause in Contracts

Hardware Signaling Pin Timing Requirements. Per specifications given in Ref.[2] 2 The MSA recommends host termination resistor value of 560 Ohms, which provides the best balance of performance for both open-drain and active tri-state driver in the module. Host termination resistor values below 560Ohms are allowed, to a minimum of 250 Ohms, but this degrades active driver performance. Host termination resistor values above 560 Ohms are allowed but this degrades open-drain driver performance. The above drawings, with maximum host load capacitance of 200pF, also define the measurement set-up for module MDC timing verification. The capacitor in the drawing indicates the stray capacitance on the line. Don’t put any physical capacitor on the line. The CFP4 module utilizes MDIO IEEE Std 802.3TM-2012 clause 45 [8] for its management interface. The CFP4 MDIO implementation is defined in a separate document entitled, “CFP MSA Management Interface Specification” [3]. When multiple CFP4 modules are connected via a single bus, a particular CFP4 module can be selected by using the Physical Port Address pins.