Virtex-6 FPGA Data Sheet: DC and Switching Characteristics
GTH Transceiver DC Input and Output Levels
Table 30 summarizes the DC output specifications of the GTH transceivers in Virtex-6 FPGAs. Consult UG371 : Virtex-6
FPGA GTH Transceivers User Guide for further details.
Table 30: GTH Transceiver DC Specifications
Symbol
DC Parameter
Conditions
Min
Typ
Max
Units
D VPPIN
Differential peak-to-peak input voltage External AC coupled
175
1200
mV
D VPPOUT
Differential peak-to-peak output
voltage (1)
Transmitter output swing is set to
maximum setting
800
1200
mV
R IN
R OUT
T OSKEW
C EXT
Differential input resistance
Differential output resistance
Transmitter output pair (TXP and TXN) intra-pair skew
Recommended external AC coupling capacitor (2)
80
80
100
100
2
100
120
120
Ω
Ω
ps
nF
Notes:
1.
2.
The output swing and preemphasis levels are programmable using the attributes discussed in UG371 : Virtex-6 FPGA GTH Transceivers User
Guide and can result in values lower than reported in this table.
Other values can be used as appropriate to conform to specific protocols and standards.
Table 31 summarizes the DC specifications of the clock input of the GTH transceiver. Consult UG371 : Virtex-6 FPGA GTH
Transceivers User Guide for further details.
Table 31: GTH Transceiver Clock DC Input Level Specification
Symbol
V IDIFF
R IN
C EXT
DC Parameter
Differential peak-to-peak input voltage
Differential input resistance
Required external AC coupling capacitor
Conditions
≤ 600 MHz
> 600 MHz
Min
500
600
80
Typ
100
100
Max
1600
1600
120
Units
mV
mV
Ω
nF
DS152 (v3.6) March 18, 2014
Product Specification
19
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