Quads on the same side of the device share common power planes.
The following three cases are analyzed:
1) If all of the GTH Quads on the same side of the device are not used, then connect the pins as shown in the table below:
| Pin Name | Connection |
| MGTRXP[0:3] MGTRXN[0:3] | VCCINT(1.0V) |
| MGTTXP[0:3] MGTTXN[0:3] | VCCINT(1.0V) |
| MGTREFCLKP MGTREFCLKN | VCCINT(1.0V) |
| MGTHAVCC | VCCINT(1.0V) |
| MGTHAVCCRX | VCCINT(1.0V) |
| MGTHAVCCPLL | VCCINT(1.0V) |
| MGTHAVTT | VCCINT(1.0V) |
| MGTRBIAS | VCCINT(1.0V) |
2) If any GTH Quads on the same side of the device are used, then all of the GTH power supply pins on that side of the part must be powered with nominal voltages.
The following table covers the case when a GTH Quad will not be used, but at least one other GTH Quad on that side of the part will be used:
| Pin Name | Connection |
| MGTRXP[0:3] MGTRXN[0:3] | Float |
| MGTTXP[0:3] MGTTXN[0:3] | Float |
| MGTREFCLKP MGTREFCLKN | GND |
| MGTHAVCC | 1.1 Vdc (See Note) |
| MGTHAVCCRX | 1.1 Vdc (See Note) |
| MGTHAVCCPLL | 1.8 Vdc (See Note) |
| MGTHAVTT | 1.2 Vdc (See Note) |
| MGTRBIAS | MGTHAVTT (1.2 Vdc) |
3) In the partially used Quad for unused transmitters and receivers, connect the pins as shown in the table below:
| Unused GTH - Pin Name | Connection |
| MGTRXP[0:3] MGTRXN[0:3] | Float |
| MGTTXP[0:3] MGTTXN[0:3] | Float |
| Partially used Quad - Pin Name | Connection |
| MGTHAVCC | 1.1 Vdc |
| MGTHAVCCRX | 1.1 Vdc |
| MGTHAVCCPLL | 1.8 Vdc |
| MGTHAVTT | 1.2 Vdc |
| MGTRBIAS | Connect this pin to a 1K ohm resistor with the other terminal of the resistor connected to ground. |
| MGTHAGND | GND |
NOTE: GTH pins definition:
| Pin Name | Description |
| MGTRXP[0:3] MGTRXN[0:3] | GTH receiver input pins. |
| MGTTXP[0:3] MGTTXN[0:3] | GTH transmitter output pins. |
| MGTREFCLKP MGTREFCLKN | GTH reference clock input pins. |
| MGTHAVCC | Analog supply for internal circuits for the receiver and the transmitter. Nominal voltage = 1.1 Vdc |
| MGTHAVCCRX | Analog supply for the PLL and the receiver equalizers. Nominal voltage = 1.1 Vdc |
| MGTHAVCCPLL | Analog supply for the reference clock buffer and the PLL. Nominal voltage 1.8 Vdc |
| MGTHAVTT | Analog supply for the transmit driver. Nominal voltage = 1.2 Vdc |
| MGTRBIAS | Provides internal precision current, voltage and resistor references for the GTH QUAD. Connect this pin to a 1K ohm resistor with the other terminal of the resistor connected to ground. |
| MGTHAGND | Ground reference for the GTH transceiver internal circuitry. These pins should be connected to the printed circuit board power supply ground reference plane. |
| AR# 34916 | |
|---|---|
| 日期 | 02/11/2013 |
| 状态 | Active |
| Type | 综合文章 |
| 器件 | |