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Hardware Specifications
Doc. No. MV-S104859-U0 Rev. E Copyright © 2008 Marvell
Page 118 Document Classification: Proprietary Information December 2, 2008, Preliminary
8.7 Differential Interface Electrical Characteristics
This section provides the reference clock, AC, and DC characteristics for the following differential
interfaces:
PCI Express Interface Electrical Characteristics
SATA Interface Electrical Characteristics
USB Electrical Characteristics
8.7.1 Differential Interface Reference Clock Characteristics
8.7.1.1 PCI Express Interface Differential Reference Clock Characteristics
Table 64: PCI Express Interface Differential Reference Clock Characteristics
Description Symbol Min Max Units Notes
Clock frequency fCK MHz -
Clock duty cycle DCrefclk 0.4 0.6 tCK -
Differential rising/falling slew rate SRrefclk 0.6 4.0 V/nS 3
Differential high voltage VIHrefclk 150.0 - mV -
Differential low voltage VILrefclk - -150.0 mV -
Absolute crossing point voltage Vcross 250.0 550.0 mV 1
Variation of Vcross over all rising clock edges Vcrs_dlta - 140.0 mV 1
Average differential clock period accuracy Tperavg -300.0 2800.0 ppm -
Absolute differential clock period Tperabs 9.8 10.2 nS 2
Differential clock cycle-to-cycle jitter Tccjit - 150.0 pS -
Notes :
General Comment: The reference clock timings are based on 100 ohm test circuit.
General Comment: Refer to the PCI Express Card Electromechanical Specification, Revision 1.1,
March 2005, section 2.1.3 for more information.
1. Defined on a single-ended signal.
2. Including jitter and spread spectrum.
3. Defined from -150 mV to +150 mV on the differential waveform.
100.0