Providing Power
Filter Network Design Guidelines
The selection criteria for the filter network are:????
Place the filter network as close as possible to the device power pin.
Ensure a low-inductance connection between the capacitor and the power pin.Simulate the filter circuit and optimize it, if possible.
Isolate the analog supply plane between the filter and the FPGA pin. Make sure thatno signals can capacitively or inductively couple into this supply.
Boundary-Scan Testing Guidelines
If Boundary-Scan(1) is to be used as part of the product verification, make sure that the analog supply voltage pin MGTAVCC of all GTX_DUAL tiles of the device are powered. The analog supply voltage pin MGTAVCC of all unused GTX_DUAL tiles must be
connected to the same supply that supplies VCCINT. VCCINT is the power supply pin for the internal core logic.
Providing Power
Overview
This section focuses on the various configurations of powering the GTX transceivers for optimal power consumption and minimizing board real-estate for filtering schemes.
Description
This subsection describes various use cases for powering the GTX transceivers. The specific rules used to derive these cases are described in “Resistor Calibration Circuit,” page 255 and “Power Supply Design and Filtering,” page 260.Note:
?
MGTAVTTRXC, MGTAVTTRXC_R, MGTAVTTRXC_L, MGTRREF, MGTRREF_Land MGTRREF_R are column-specific, not dual-specific. They are repeated in alluse cases for completeness.
These use case descriptions do not specifically reference the MGT*_L or MGT*_Rpower supplies. For TXT devices, it is assumed that the given recommendationsapply to the appropriate column in use.
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1.Using any of the following JTAG operations (INTEST, EXTEST, SAMPLE, or PRELOAD), configuration via JTAG or ChipScope? tool operations is NOT affected.
RocketIO GTX Transceiver User GuideUG198 (v3.0) October 30, 2009
Chapter 10:GTX-to-Board Interface
Partially Used Column
Table10-6 shows the configuration for Use Case 1, where:???
A GTX_DUAL tile is usedOne or both transceivers are usedBoundary-Scan is always functional
Use Case 1
Connect ToGND(1) or transmitterFloating, no connection(2), or
receiverFloating, no connection(3), or
reference clock source1.2V dedicated supply(4)1.2V dedicated supply(4)
MGTAVTTRX(5)1.0V dedicated supply(4)1.0V dedicated supply(4)MGTAVTTTX with resistor(6)
Filter---YYYYY-Pin or Pin PairMGTRXP/MGTRXNMGTTXP/MGTTXNMGTREFCLKP/MGTREFCLKN
MGTAVTTTXMGTAVTTRXMGTAVTTRXCMGTAVCCPLLMGTAVCCMGTRREF
Notes:
1.2.3.4.5.6.
If only a single transceiver is used, connect the pins of the unused transceiver to GND.If only single transceiver is used, leave the pins of the unused transceiver floating.If the reference clock input is unused, leave the pins floating.Refer to Figure10-5, page262.Refer to Figure10-3, page257.
Refer to Figure10-1, page256 and Figure10-4, page258.
Table 10-6:
Table10-7 shows the configuration for Use Case 2, where:???
A GTX_DUAL tile is unusedBoth transceivers are unusedBoundary-Scan is not functioning
Use Case 2
Connect To
GND
Floating, no connectionFloating, no connection
GNDGNDMGTAVTTRX(1)
GND
Filter-----Y-Pin or Pin PairMGTRXP/MGTRXNMGTTXP/MGTTXNMGTREFCLKP/MGTREFCLKN
MGTAVTTTXMGTAVTTRXMGTAVTTRXCMGTAVCCPLL
Table 10-7:
RocketIO GTX Transceiver User Guide
UG198 (v3.0) October 30, 2009
Providing Power
Table 10-7:Use Case 2 (Cont’d)
Connect To
GND
MGTAVTTTX with resistor(2)
Filter--
Pin or Pin PairMGTAVCCMGTRREF
Notes:
1.Connect to MGTAVTTRX of a used GTX_DUAL tile. Refer to Figure10-3, page257.
2.Connect to MGTAVTTTX of a used GTX_DUAL tile. Refer to Figure10-1, page256 and Figure10-4,page258.
Table10-8 shows the configuration for Use Case 3, where:???
A GTX_DUAL tile is unusedBoth transceivers are unusedBoundary-Scan is functioning
Use Case 3
Connect To
GND
Floating, no connectionFloating, no connection
GNDGNDMGTAVTTRX(1)
GNDVCCINT
MGTAVTTTX with resistor(2)
Filter-----Y---Pin or Pin PairMGTRXP/MGTRXNMGTTXP/MGTTXNMGTREFCLKP/MGTREFCLKN
MGTAVTTTXMGTAVTTRXMGTAVTTRXCMGTAVCCPLLMGTAVCCMGTRREF
Notes:
1.Connect to MGTAVTTRX of a used GTX_DUAL tile. Refer to Figure10-3, page257.
2.Connect to MGTAVTTTX of a used GTX_DUAL tile. Refer to Figure10-1, page256 and Figure10-4,page258.
Table 10-8:
Table10-9 shows the configuration for Use Case 4, where:???
A GTX_DUAL tile is used only for forwarding resistor calibration informationgenerated in the center tile of the columnBoth transceivers are unusedBoundary-Scan is always functional
Use Case 4
Connect To
GND
Floating, no connectionFloating, no connection
GND
Filter----Pin or Pin PairMGTRXP/MGTRXNMGTTXP/MGTTXNMGTREFCLKP/MGTREFCLKN
MGTAVTTTX
Table 10-9:
RocketIO GTX Transceiver User GuideUG198 (v3.0) October 30, 2009
Chapter 10:GTX-to-Board Interface
RocketIO GTX Transceiver User Guide
UG198 (v3.0) October 30, 2009
Section 2: Board Level Design
RocketIO GTX Transceiver User Guide
UG198 (v3.0) October 30, 2009
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