Altera Transceiver PHY IP Core Manual de usuario Pagina 197

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Signal Name Direction Description
pipe_g3_txdeemph[17:0] Input
For Gen3, selects the transmitter de-emphasis. The
18 bits specify the following coefficients:
[5:0]: C
-1
[11:6]: C
0
[17:12]: C
+1
Refer toTable 8-4 for presets to TX de-emphasis
mappings.
In Gen3 capable designs, the TX deemphasis for
Gen2 data rates is always -6 dB. The TX
deemphasis for Gen1 data rate is always -3.5 dB.
pipe_txmargin[3<n>-1:0] Input
Transmit V
OD
margin selection. The MAC PHY
sets the value for this signal based on the value
from the Link Control 2 Register. The following
encodings are defined:
3'b000: Normal operating range
3'b001: Full swing: 800 - 1200 mV; Half swing:
400 - 700 mV
3'b010:–3’b011: Reserved
3'b100–3’b111: If last value, full swing: 200 - 400
mV, half swing: 100 - 200 mV else reserved
pipe_txswing Input
Indicates whether the transceiver is using full- or
low-swing voltages as defined by the tx_
pipemargin.
1’b0–Full swing.
1’b1–Low swing.
pipe_rxpolarity Input When 1, instructs the PHY layer to invert the
polarity on the received data.
pipe_rate[1:0] Input
The 2-bit encodings have the following meanings:
2’b00: Gen1 rate (2.5 Gbps)
2’b01: Gen2 rate (5.0 Gbps)
2’b1x: Gen3 (8.0 Gbps)
The Rate Switch from Gen1 to Gen2 Timing
Diagram illustrates the timing of a rate switch from
Gen1 to Gen2 and back to Gen1.
UG-01080
2015.01.19
PHY for PCIe (PIPE) Input Data from the PHY MAC
8-9
PHY IP Core for PCI Express (PIPE)
Altera Corporation
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