Altera 40-Gbps Ethernet MAC and PHY MegaCore Function Bedienungsanleitung Seite 67
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40-100GbE IP Core RX Datapath
The 40-100GbE RX MAC receives Ethernet frames from the PHY and forwards the payload with relevant
header bytes to the client after performing some MAC functions on header bytes.
Figure 3-18: Flow of Frame Through the MAC RX Without Preamble Pass-Through
Illustrates the typical flow of frame through the MAC RX when the preamble pass-through feature is
turned off. In this figure, <p> is payload size (0–1500 bytes), and <s> is the number of pad bytes (0–46
bytes).
Client - MAC Rx Interface
Client Frame
MAC Frame
Destination
Addr[47:0]
Source
Addr[47:0]
Type/
Length[15:0]
Payload
[<p-1>:0]
Destination
Addr[47:0]
SFD[7:0]
Preamble
[47:0]
CRC32
[31:0]
PAD [<s>-1:0]
Source
Addr[47:0]
Start[7:0]
EFD[7:0]
Figure 3-19: Flow of Frame Through the MAC RX With Preamble Pass-Through Turned On
Illustrates the typical flow of frame through the MAC RX when the preamble pass-through feature is
turned on. In this figure, <p> is payload size (0–1500 bytes), and <s> is the number of pad bytes (0–46
bytes).
Client - MAC Rx Interface
Client Frame
MAC Frame
Destination
Addr[47:0]
Source
Addr[47:0]
Type/
Length[15:0]
Payload
[<p-1>:0]
Destination
Addr[47:0]
SFD[7:0]
Preamble
[47:0]
CRC32
[31:0]
PAD [<s>-1:0]
Source
Addr[47:0]
Start[7:0]
SFD[7:0]
Preamble
[47:0]
Start[7:0]
EFD[7:0]
The following sections describe the functions performed by the RX MAC:
40-100GbE IP Core RX Filtering on page 3-21
40-100GbE IP Core Preamble Processing on page 3-21
40-100GbE IP Core FCS (CRC-32) Removal on page 3-22
40-100GbE IP Core CRC Checking on page 3-22
RX CRC Forwarding on page 3-22
RX Automatic Pad Removal Control on page 3-22
Address Checking on page 3-24
Inter-Packet Gap on page 3-24
Pause Ignore on page 3-24
3-20
40-100GbE IP Core RX Datapath
UG-01088
2014.12.15
Altera Corporation
Functional Description
Send Feedback
- MegaCore Function User Guide 1
- Contents 2
- PHY MegaCore Function 4
- 40- or 100-GbE MAC 5
- Device Family Support 7
- IP Core Verification 9
- Simulation Environment 10
- Hardware Testing 10
- Module ALMs Logic Registers 11
- Release Information 21
- Item Description 22
- Getting Started 23
- OpenCore Plus IP Evaluation 24
- IP Core Parameters 25
- Parameter Type Range Default 28
- Parameter Description 28
- Simulating the IP Core 32
- Pin Assignments 33
- 40-100GbE IP Core Testbenches 36
- Testbenches with Adapters 37
- File Names Description 38
- Testbenches without Adapters 40
- Initializing the IP Core 46
- High Level System Overview 49
- 40-100GbE IP Core TX Datapath 50
- Address Insertion 51
- Length/Type Field Processing 52
- Frame Padding 52
- Client Interface 53
- Data Bus Width (Bits) 53
- 40GbE IP Core 100GbE IP Core 53
- 40-100GbE IP Core RX Datapath 67
- RX CRC Forwarding 69
- Address Checking 71
- Inter‑Packet Gap 71
- Pause Ignore 71
- Name Direction Description 73
- 100GbE CAUI–4 PHY 79
- Pause Transmission Logic 82
- Statistics Counters Interface 86
- Name Signal 87
- Direction 87
- Description 87
- Control Data Description 89
- Lane to Lane Deskew Interface 90
- MII Control 91
- MII Data 91
- PCS BER Monitor 92
- Control and Status Interface 98
- Signal Name Description 100
- UG-01088 101
- 2014.12.15 101
- Related Information 102
- Send Feedback 103
- Altera Corporation 103
- Functional Description 103
- Software Interface: Registers 123
- Register Description 124
- 40-100GbE IP Core Registers 126
- Address Name Applicable 128
- Device(s) 128
- Bit Description HW Reset 128
- Bits Description HW Reset 130
- Lock Status Registers 131
- Bit Error Flag Registers 133
- PCS Hardware Error Register 134
- BER Monitor Register 134
- Test Mode Register 135
- Test Pattern Counter Register 135
- MAC and PHY Reset Registers 136
- PCS‑VLANE Registers 138
- PRBS Registers 139
- 40GBASE-KR4 Registers 139
- Pause Registers 149
- MAC Hardware Error Register 151
- CRC Configuration Register 152
- MAC Address Registers 154
- Statistics Registers 155
- PMD Registers 163
- MDIO Registers 164
- Ethernet Glossary 166
- Term Definition 167
- Subscribe 169
- Core v12.0 Release 173
- 10GBASE-KR Registers 174
- Bit R/W Name Description 175
- Additional Information 190
- Date ACDS 191
- at offset 0x127), described 193
- How to Contact Altera 198
- Typographic Conventions 198
- Visual Cue Meaning 199
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