Kintex-7 FPGAs Data Sheet: DC and AC Switching Characteristics
GTX Transceiver Specifications
GTX Transceiver DC Input and Output Levels
Table 52 summarizes the DC output specifications of the GTX transceivers in Kintex-7 FPGAs. Consult the 7 Series FPGAs
GTX/GTH Transceivers User Guide ( UG476 ) for further details.
Table 52: GTX Transceiver DC Specifications
Symbol
DC Parameter
Conditions
Min
Typ
Max
Units
DV PPOUT
Differential peak-to-peak output Transmitter output swing is set to
voltage (1) maximum setting
1000
mV
V CMOUTDC
DC common mode output
voltage.
Equation based
V MGTAVTT – DV PPOUT /4
mV
R OUT
T OSKEW
Differential output resistance
Transmitter output pair (TXP and TXN) intra-pair skew
100
2
12
Ω
ps
Differential peak-to-peak input
>10.3125 Gb/s
150
1250
mV
DV PPIN
V IN
V CMIN
R IN
voltage (external AC coupled)
Absolute input voltage
Common mode input voltage
Differential input resistance
6.6 Gb/s to 10.3125 Gb/s
≤ 6.6 Gb/s
DC coupled V MGTAVTT = 1.2V
DC coupled V MGTAVTT = 1.2V
150
150
–200
2/3 V MGTAVTT
100
1250
2000
V MGTAVTT
mV
mV
mV
mV
Ω
C EXT
Recommended external AC coupling
capacitor (2)
100
nF
Notes:
1.
2.
The output swing and preemphasis levels are programmable using the attributes discussed in the 7 Series FPGAs GTX/GTH
Transceivers User Guide ( UG476 ) 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.
X-Ref Target - Figure 1
+V
P
S ingle-Ended
0
X-Ref Target - Figure 2
+V
N
Figure 1: Single-Ended Peak-to-Peak Voltage
Volt a ge
d s 1 8 2_01_041712
0
–V
P–N
Figure 2: Differential Peak-to-Peak Voltage
Differenti a l
Volt a ge
d s 1 8 2_02_042712
DS182 (v2.8) March 4, 2014
Product Specification
48
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