Altera Low Latency Ethernet 10G MAC Instrukcja Użytkownika Strona 9
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MAC Settings
ALMs ALUTs
Logic
Registers
Memory Block
Operating
Mode
Enabled Options
10M/
100M/
1G/10G
Timestamping
and memory-
based statistics
counters.
Time of day: 96b
and 64b.
5,100 7,200 11,700 19 (M20K)
Time of day: 96b 4,900 6,900 11,000 18 (M20K)
Time of day
format: 64b
4,300 6,200 10,200 15 (M20K)
10M/
100M/
1G/10G
All options enabled except the
options to maintain compatibility
with the legacy Ethernet 10G MAC.
5,400 7,600 12,200 27 (M20K)
TX and RX Latency
The TX and RX latency values are based on the following definitions and assumptions:
• TX latency is the time taken for the data frame to move from the Avalon-ST interface to the PHY-side
interface.
• RX latency is the time taken for the data frame to move from the PHY-side interface to the Avalon-ST
interface.
• No backpressure on the Avalon-ST TX and RX interfaces.
• All options under Legacy Ethernet 10G MAC interfaces, that allow compatibility with the legacy
MAC are disabled.
Table 1-5: TX and RX Latency Values
MAC Operating Mode Speed
Latency (ns)
TX RX Total
10G 10 Gbps 22.4 38.4 60.8
1G/10G 1 Gbps 79.2 277.6 356.8
10M/100M/1G/10G 10 Mbps 1,952.8 27,215.2 29,168
10M/100M/1G/10G 100 Mbps 232.8 2,735.2 2,968
UG-01144
2014.12.15
TX and RX Latency
1-5
About LL Ethernet 10G MAC
Altera Corporation
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- Low Latency Ethernet 10G MAC 1
- Contents 2
- About LL Ethernet 10G MAC 5
- Features 6
- Release Information 7
- Resource Utilization 8
- TX and RX Latency 9
- Related Information 10
- Parameter Settings 13
- Parameter Value Description 13
- Generated Files 15
- Extension Description 15
- Quartus II 17
- Design Flow 17
- Gate-Level Simulation 17
- RTL Simulation 17
- Altera Corporation 19
- Send Feedback 19
- Design Considerations 20
- Pseudo-Static CSR Fields 21
- Clock Crosser 21
- Dual Clock FIFO 22
- Subscribe 23
- Interfaces 24
- Interfaces Description 24
- Figure 3-2: Interface Signals 25
- Padding Bytes Insertion 26
- Address Insertion 26
- CRC-32 Insertion 27
- XGMII Encapsulation 28
- XGMII Transmission 29
- Unidirectional Feature 30
- TX Timing Diagrams 31
- RX Datapath 35
- Address Checking 36
- Frame Type Checking 36
- Length Checking 36
- Frame Length 37
- Payload Length 37
- Overflow Handling 38
- RX Timing Diagrams 38
- IEEE 802.3 Flow Control 39
- Pause Frame Reception 40
- Pause Frame Transmission 40
- Priority-Based Flow Control 41
- PFC Frame Reception 42
- PFC Frame Transmission 42
- Reset Requirements 42
- No Stage Steps 43
- Operating Mode PHY 44
- IEEE 1588v2 47
- Transmit Datapath 48
- Receive Datapath 49
- Frame Format 49
- PTP Packet over UDP/IPv4 50
- PTP Packet over UDP/IPv6 51
- 4 Octets 52
- Register Map 53
- Word Offset Purpose Variation 53
- (10-Gbps Ethernet MAC) 54
- (LL Ethernet 10G MAC) 54
- Register Access 56
- Access Definition 57
- Flow Control Registers 62
- Delay Device PMA Mode 76
- Latency MAC Configurations 76
- ECC Registers 76
- Statistics Registers 77
- Clock and Reset Signals 83
- Signal Operating 83
- Direction Width Description 83
- Unidirectional Signals 86
- Avalon-MM Programming Signals 86
- Avalon-ST Data Interfaces 87
- Avalon-ST Status Interface 90
- PHY-side Interfaces 94
- XGMII RX Signals 97
- GMII TX Signals 98
- GMII RX Signals 99
- MII TX Signals 99
- MII RX Signals 99
- 1588v2 Interfaces 100
- UG-01144 101
- 2014.12.15 101
- Additional Information 107
- Date Version Changes 108
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