88F6281
Hardware Specifications
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
fCK
Min
Max
Units
MHz
tCK
V/nS
mV
Notes
Clock frequency
Clock duty cycle
100.0
-
-
DCrefclk
SRrefclk
VIHrefclk
VILrefclk
Vcross
Vcrs_dlta
Tperavg
Tperabs
Tccjit
0.4
0.6
0.6
4.0
Differential rising/falling slew rate
Differential high voltage
3
-
150.0
-
-
Differential low voltage
-150.0
550.0
140.0
2800.0
10.2
mV
-
Absolute crossing point voltage
Variation of Vcross over all rising clock edges
Average differential clock period accuracy
Absolute differential clock period
Differential clock cycle-to-cycle jitter
Notes :
250.0
-
mV
1
1
-
mV
-300.0
9.8
ppm
nS
2
-
-
150.0
pS
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 w aveform.
Doc. No. MV-S104859-U0 Rev. E
Copyright © 2008 Marvell
Page 118
Document Classification: Proprietary Information
December 2, 2008, Preliminary
MARVELL [ MARVELL TECHNOLOGY GROUP LTD. ]
