AV-51002
2015.12.16
2-22
Reference Clock
Transceiver Speed Grade 2
Transceiver Speed Grade 3
Symbol/Description
Conditions
Unit
Min
45
Typ
—
Max
55
Min
45
Typ
—
Max
55
Duty cycle
—
%
Spread-spectrum modulating
clock frequency
PCI Express ®(PCIe)
30
—
33
30
—
33
kHz
Spread-spectrum downspread PCIe
—
0 to
—
—
0 to
—
%
–0.5
–0.5
On-chip termination resistors
Absolute VMAX
—
—
—
100
—
—
—
—
100
—
—
Ω
V
Dedicated reference clock
pin
1.6
1.6
RX reference clock pin
—
—
—
—
1.2
—
—
—
—
—
1.2
—
Absolute VMIN
—
—
–0.4
200
–0.4
200
V
Peak-to-peak differential input
voltage
1600
1600
mV
Dedicated reference clock
pin
1000/900/850 (138)
1000/900/850 (138)
mV
VICM (AC coupled)
VICM (DC coupled)
RX reference clock pin
1.0/0.9/0.85 (139)
—
1.0/0.9/0.85(139)
—
mV
mV
HCSL I/O standard for
PCIe reference clock
250
550
250
550
(138)
The reference clock common mode voltage is equal to the VCCR_GXB power supply level.
This supply follows VCCR_GXB
(139)
Arria V GZ Device Datasheet
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