The Reset Controller helper block must be provided with the free running clock
gtwiz_reset_clk_freerun_in that you have specified
during IP customization. A single instance of the helper block is delivered with each
instance of the GT Bridge IP core.
| Name | Direction | Width | Clock Domain | Description |
|---|---|---|---|---|
| gtwiz_reset_clk_freerun_in | IN | 1 | ASYNC | Free running clock, used to reset transceiver primitives. It should be toggling before device configuration. |
| gtwiz_reset_all_in | IN | 1 | ASYNC | Signal to reset the phase-locked loops (PLLs) and active data
directions of transceiver primitives. The falling edge of an
active-High, asynchronous pulse of at least one gtwiz_reset_clk_freerun_in period in the duration
initializes the process. |
| gtwiz_reset_tx_pll_and_datapath_in | IN | 1 | ASYNC | Signal to reset the transmit data direction and associated PLLs of
transceiver primitives. An active-High, asynchronous pulse of at least
one gtwiz_reset_clk_freerun_in period
in the duration initializes the process. |
| gtwiz_reset_tx_datapath_in | IN | 1 | ASYNC | Signal to reset the transmit data direction of transceiver primitives.
An active-High, asynchronous pulse of at least one gtwiz_reset_clk_freerun_in period in the
duration initializes the process. |
| gtwiz_reset_rx_pll_and_datapath_in | IN | 1 | ASYNC | Signal to reset the receive data direction and associated PLLs of
transceiver primitives. An active-High, asynchronous pulse of at least
one gtwiz_reset_clk_freerun_in period
in the duration initializes the process. |
| gtwiz_reset_rx_datapath_in | IN | 1 | ASYNC | Signal to reset the receive data direction of transceiver primitives.
An active-High, asynchronous pulse of at least one gtwiz_reset_clk_freerun_in period in the
duration initializes the process. |
| gtpowergood_in | IN | 1 | ASYNC | Connected to GTPOWERGOOD signals produced by the
transceiver channel logic. |
| gtwiz_reset_userclk_tx_active_in | IN | 1 | ASYNC |
For GTY, GTYP: Logical AND of all TXPROGDIVRESETDONE signals
produced by the transceiver channel primitives. |
| gtwiz_reset_userclk_rx_active_in | IN | 1 | ASYNC |
For GTY, GTYP: Logical AND of all RXPROGDIVRESETDONE signals
produced by the transceiver channel primitives. |
| mst_tx_resetdone | IN | 1 | ASYNC | Logical AND of all MSTTXRESETDONE signals produced by
transceiver channel primitives. |
| mst_tx_resetdone | IN | 1 | ASYNC | Logical AND of all MSTRXRESETDONE
signals produced by the transceiver channel primitives. |
| mst_tx_reset | OUT | 1 | gtwiz_reset_clk_freerun_in | Active-High signal fanned out to TXMSTRESET port of transceiver channels. |
| mst_rx_reset | OUT | 1 | gtwiz_reset_clk_freerun_in | Active-High signal fanned out to RXMSTRESET port of transceiver channels. |
| mst_tx_dp_reset | OUT | 1 | gtwiz_reset_clk_freerun_in | Active-High signal fanned out to TXMSTDATAPATHRESET port of transceiver channels. |
| mst_rx_dp_reset | OUT | 1 | gtwiz_reset_clk_freerun_in | Active-High signal fanned out to RXMSTDATAPATHRESET port of transceiver channels. |
| txuserrdy_out | OUT | 1 | gtwiz_reset_clk_freerun_in | Active-High signal fanned out to TXUSERRDY port of all transceiver channel primitives. |
| rxuserrdy_out | OUT | 1 | gtwiz_reset_clk_freerun_in | Active-High signal fanned out to RXUSERRDY port of all transceiver channel primitives. |
| gtwiz_reset_tx_done_out | OUT | 1 | gtwiz_reset_clk_freerun_in | Active-High indication that the transmitter reset sequence of transceiver primitives, as initiated by the reset controller helper block, is completed. |
| gtwiz_reset_rx_done_out | OUT | 1 | gtwiz_reset_clk_freerun_in | Active-High indication that the receiver reset sequence of transceiver primitives, as initiated by the reset controller helper block, is completed. |
The helper block follows the controller reset sequence and contains two state machines.
- Transmitter Reset State Machine
- Resets the transmitter PLL and/or the transmitter datapath of all
transceiver primitives and indicates their completion.Figure 1. Transmitter Reset State Machine
- Receiver Reset State Machine
- Resets the receiver PLL and/or the receiver datapath of all transceiver
primitives and indicates their completion.Figure 2. Receiver Reset State Machine
The gtwiz_reset_all_in input initiates both
transmitter and receiver state machines. The transmitter and receiver reset state
machines are independent of one another. Each can be initiated either directly through
the user interface if needed or controlled by the gtwiz_reset_all_in input.
When the gtwiz_reset_all_in signal is
activated, the transmitter and receiver state machines are initiated simultaneously. If
the channel configuration is set up such that the receiver incoming data is dependent on
the transmitter data, the receiver should go through a separate datapath reset after the
gtwiz_reset_all_in has completed, or use the
reset_tx_pll_and_datapath followed by reset_rx_datapath.