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Chapter 8: PHY IP Core for PCI Express (PIPE) 8–7
PIPE Input Data from the PHY MAC
November 2012 Altera Corporation Altera Transceiver PHY IP Core
User Guide
pipe_powerdown<n>[1:0]
Input
This signal requests the PHY to change its power state to the specified
state. The following encodings are defined:
■ 2’b00– P0, normal operation
■ 2’b01–P0s, low recovery time latency, power saving state
■ 2’b10–P1, longer recovery time (64 us maximum latency), lower
power state
■ 2’b11–P2, lowest power state. (not supported)
pipe_txdeemph
Input
Transmit de-emphasis selection. In PCI Express Gen2 (5 Gbps) mode it
selects the transmitter de-emphasis:
■ 1'b0: -6 dB
■ 1'b1: -3.5 dB
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 to Table 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.
Table 8–3. Avalon-ST TX Inputs (Part 2 of 3)
Signal Name Dir Description
Gen1 and Gen2
- User Guide 1
- Contents 3
- Chapter 6. XAUI PHY IP Core 5
- Chapter 9. Custom PHY IP Core 6
- ContentsContents vii 7
- ContentsContents ix 9
- Additional Information 11
- 1. Introduction 13
- 1–2 Chapter 1: Introduction 14
- Avalon-MM PHY Management 15
- 1–4 Chapter 1: Introduction 16
- Chapter 1: Introduction 1–5 17
- Unsupported Features 18
- 2. Getting Started 19
- Specifying Parameters 20
- Simulate the IP Core 22
- 3. 10GBASE-R PHY IP Core 23
- 10GBASE-R protocol 24
- Arria V GT 10GBASE-R 25
- Transceiver Protocol 25
- General Option Parameters 29
- Interfaces 32
- Clocks for Arria V GT Devices 36
- Clocks for Arria V GZ Devices 37
- Clocks for Stratix IV Devices 37
- Clocks for Stratix V Devices 39
- 10GBASE-R PHY IP Core 47
- Note to Table 4–3: 51
- Speed Detection 54
- Functional Description 56
- Clock and Reset Interfaces 59
- SDR XGMII interface: 62
- Control and Status Interfaces 63
- PHY Link Training 64
- Daisy-Chain Mode 65
- 10GBASE-KR PHY 1GbE Registers 80
- Creating a 10GBASE-KR Design 83
- WAN Wide Area Network 87
- Acronym Definition 87
- 1G/10GbE Release Information 90
- 10GBASE-R Parameters 92
- 1Gb Ethernet Parameters 92
- 1G/10GbE Registers 100
- PMA Registers 101
- PCS Registers 102
- GMII PCS Registers 103
- Sequencer 106
- Cntl & 106
- Creating a 1G/10GbE Design 107
- Editing a MIF File 108
- Design Examples 109
- Dynamic Reconfiguration 110
- Simulation 111
- TimeQuest Timing Constraints 111
- Acronyms 111
- 6. XAUI PHY IP Core 113
- Release Information 114
- Device Family Support 114
- Devices 115
- Parameterizing the XAUI PHY 115
- General Parameters 116
- Analog Parameters 117
- Stratix IV Devices 118
- Advanced Options Parameters 119
- Configurations 120
- Data Interfaces 122
- SDR XGMII TX Interface 124
- SDR XGMII RX Interface 124
- XAUI Hard IP Core 125
- Hard PCS 125
- Soft PCS 125
- TimeQuest Timing Cons 135
- Interlaken PHY IP Core 137
- Optional Port Parameters 140
- Interfaces 141
- Avalon-ST TX Interface 142
- Avalon-ST RX Interface 144
- TX and RX Serial Interface 147
- PLL Interface 147
- Optional Clocks for Deskew 148
- Resource Utilization 154
- General Options Parameters 155
- s window for Gen1 or Gen2 160
- s window for Gen1 160
- Figure 8–4 illustrates the 162
- Optional Status Interface 163
- Serial Data Interface 164
- PHY IP Core for PCI Express 165
- Hard PCS and PMA 165
- Phase 2 (Optional) 170
- Phase 3 (Optional) 171
- 9. Custom PHY IP Core 175
- Custom PHY IP Core 176
- Stratix V FPGA 176
- Word Alignment Parameters 181
- Rate Match FIFO Parameters 182
- Byte Order Parameters 183
- SOP to a different byte lane 184
- IP Core 186
- Presets for Ethernet 187
- RX interface 190
- Clock Interface 191
- Custom PHY PCS and PMA 193
- 10. Low Latency PHY IP Core 199
- (PCS-PMA interface width) 202
- Additional Options Parameters 203
- PMA and Light-Weight PCS 210
- Auto-Negotiation 216
- Note to Figure11–2: 217
- Delay Estimation Logic 219
- Delay Numbers 220
- the number of bits 230
- Deterministic PHY IP Core 232
- Parameter Presets 241
- PMA Parameters 243
- TX PMA Parameters 244
- TX PLL<n> 245
- RX CDR Options 246
- PMA Optional Ports 246
- Standard PCS Parameters 249
- Phase Compensation FIFO 250
- Rate Match FIFO 253
- 10G PCS Parameters 257
- 10G TX FIFO 258
- Stratix V Devices 259
- 100 ppm 260
- Interlaken Frame Generator 262
- Interlaken Frame Synchronizer 263
- s period 265
- s period, the 265
- 64b/66b Encoder and Decoder 266
- 96-bit bound. It adds the 67 267
- Common Interface Ports 270
- Standard PCS Interface Ports 273
- 10G PCS Interface 276
- SDC Timing Constraints 284
- Simulation Support 286
- RX PMA Parameters 292
- Arria V Devices 299
- Cyclone V Devices 368
- Controller IP Core 379
- Altera V-Series FPGA 381
- 500 400 0 0 100 383
- 4.9152 Gbps 387
- Embedded 389
- Controller 389
- Offset Cancellation 390
- Duty Cycle Calibration 390
- PMA Analog Control Registers 391
- 7’h0C [6:0] RW 391
- EyeQ Registers 392
- DFE Registers 394
- (Part 1 of 2) 395
- address to 0x0 396
- (Part 2 of 2) 396
- address of 0xB 397
- AEQ Registers 399
- ATX PLL Calibration Registers 400
- PLL Reconfiguration 401
- Transceiver PHYs 402
- PLL Reconfiguration Registers 403
- 7’h44 [15:0] RW 403
- Channel Reconfiguration 405
- Streamer Module Registers 406
- register address is invalid 406
- When the 407
- register specifies a 407
- register. When 407
- register 408
- MIF Generation 409
- MIF Format 410
- Arguments: 412
- -h: Displays help 412
- Reduced MIF Creation 413
- Register-Based Write 414
- Register-Based Read 415
- Figure 16–6. Sample MIF 418
- Example 16–11. (continued) 419
- Loopback Modes 427
- Transceiver 428
- Transceiver PHY Instance 429
- Transceiver PHY 429
- Reset Controller 429
- Assignments 437
- register to enable the 455
- Transceivers 456
- Stratix V GX/GS devices 458
- Note to Table 19–3: 459
- Note to Table 19–5: 462
- Note to Table 19–7: 465
- Revision History 468
- s for Gen2 operation 476
- address 480
- Note to Table: 482
- Typographic Conventions 483
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