Xilinx 7 Series User Manual page 63

Table 2-24: Power-Down Attributes (Cont'd)
PD_TRANS_TIME_TO_P2
TRANS_TIME_RATE
RX_CLKMUX_PD
TX_CLKMUX_PD
Generic Power-Down Capabilities
The GTP transceiver provides several power-down features that can be used in a wide variety of
applications.
Table 2-25: Basic Power-Down Functions Summary
PLL0 Control
PLL1 Control
TX Power Control
RX Power Control
PLL Power Down
To activate the PLL0 power-down mode, the active-High PLL0PD signal is asserted. Similarly, to
activate the PLL1 power-down mode, the active-High PLL1PD signal is asserted. When either
PLL0PD or PLL1PD is asserted, the corresponding PLL is powered down. As a result, all clocks
derived from the respective PLL are stopped.
During initial configuration and power-on, PLL0/PLL1 must be powered down using the PLL0PD/
PLL1PD port until reference clock edges are detected. PLL0/PLL1 should be powered down if the
reference clock stops. For PLL0-based designs, when PLL1 is not used, PLL1PD can be tied High.
For PLL1-based designs, when PLL0 is not used, the PLL0PD can be tied High.
Recovery from this power state is indicated by the assertion of the corresponding PLL lock signal.
7 Series FPGAs GTP Transceivers User Guide
UG482 (v1.9) December 19, 2016
Attribute
Table 2-25 summarizes these capabilities.
Function Controlled By
PLL0PD
PLL1PD
TXPD[1:0]
RXPD[1:0]
www.xilinx.com
Type
8-bit Hex Counter settings for programmable
transition time to P2 state for PCIe. The
recommended value from the 7 Series
FPGAs Transceivers Wizard should be
used.
8-bit Hex Counter settings for programmable
transition time when the rate is changed
using the [TX/RX]RATE pins for all
protocols including the PCIe protocol
(Gen2/Gen1 data rates). The recommended
value from the 7 Series FPGAs Transceivers
Wizard should be used.
1-bit Binary The recommended value from the 7 Series
FPGAs Transceivers Wizard should be
used.
1-bit Binary The recommended value from the 7 Series
FPGAs Transceivers Wizard should be
used.
Powers down PLL0.
Powers down PLL1.
The TX of the GTP transceiver.
The RX of the GTP transceiver.
Power Down
Description
Affects
63
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