Altera Low Latency Ethernet 10G MAC Manuel d'utilisateur Page 40
- Page / 109
- Table des matières
- MARQUE LIVRES
Noté. / 5. Basé sur avis des utilisateurs
To use the IEEE 802.3 flow control, set the following registers:
• On the transmit datapath:
• Set tx_pfc_priority_enable to 0 to disable the PFC.
• Set tx_pauseframe_enable to 1 to enable the IEEE 802.3 flow control.
• On the receive datapath:
• Set rx_pfc_control to 1 to disable the PFC.
• Set the IGNORE_PAUSE bit in the rx_decoder_control register to 0 to enable the IEEE 802.3 flow
control.
Pause Frame Reception
When the MAC receives an XOFF pause frame, it stops transmitting frames to the remote partner for a
period equal to the pause quanta field of the pause frame. If the MAC receives a pause frame in the middle
of a frame transmission, the MAC finishes sending the current frame and then suspends transmission for
a period specified by the pause quanta. The MAC resumes transmission when it receives an XON pause
frame or when the timer expires. The pause quanta received overrides any counter currently stored. When
the remote partner sends more than one pause quanta, the MAC sets the value of the pause to the last
quanta it received from the remote partner. You have the option to configure the MAC to ignore pause
frames and continue transmitting frames by setting the IGNORE_PAUSE bit in the rx_decoder_control
register to 1.
Pause Frame Transmission
The MAC provides the following two methods for the client or connecting device to trigger pause frame
transmission:
• avalon_st_pause_data signal (tx_pauseframe_enable[2:1] set to 0)—You can connect this 2-bit
signal to a FIFO buffer or a client. Bit setting:
• avalon_st_pause_data[1]: 1—triggers the transmission of XOFF pause frames.
• avalon_st_pause_data[0]: 1—triggers the transmission of XON pause frames. The transmission
of XON pause frames only trigger for one time after XOFF pause frames regardless of how long the
avalon_st_pause_data[0] signal is asserted.
If pause frame transmission is triggered when the MAC is generating a pause frame, the MAC ignores
the incoming request and completes the generation of the pause frame. Upon completion, if the
avalon_st_pause_data signal remains asserted, the MAC generates a new pause frame and continues
to do so until the signal is deasserted. You can also configure the gap between successive XOFF
requests for using the tx_pauseframe_quanta register. XON pause frames will only be generated if the
MAC generates XOFF pause frames.
• tx_pauseframe_control register (tx_pauseframe_enable[2:0] set to 0x1)—A host (software) can
set this register to trigger pause frames transmission. Setting tx_pauseframe_control[1] to 1 triggers
the transmission of XOFF pause frames; setting tx_pauseframe_control[0] to 1 triggers the
transmission of XON pause frames. The register clears itself after the request is executed.
You can configure the pause quanta in the tx_pauseframe_quanta register. The MAC sets the pause
quanta field in XOFF pause frames to this register value.
Note:
The new register field determines which pause interface takes effect.
3-18
Pause Frame Reception
UG-01144
2014.12.15
Altera Corporation
Functional Description of LL Ethernet 10G MAC
Send Feedback
- 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
Produits connexes et manuels pour Instruments de mesure Altera Low Latency Ethernet 10G MAC
Instruments de mesure Altera Nios II Embedded Evaluation Kit Cyclone III Editio Manuel d'utilisateur
(3 pages)
(3 pages)
Instruments de mesure Altera Nios II Embedded Evaluation Kit Cyclone III Editio Manuel d'utilisateur
(80 pages)
(80 pages)
Instruments de mesure Altera Phase-Locked Loop Reconfiguration IP Core Manuel d'utilisateur
(51 pages)
(51 pages)
Instruments de mesure Altera Serial Digital Interface (SDI) MegaCore Function Manuel d'utilisateur
(140 pages)
(140 pages)
Instruments de mesure Altera 100G Development Kit, Stratix V GX Edition Manuel d'utilisateur
(44 pages)
(44 pages)
Instruments de mesure Altera Stratix V Avalon-MM Interface for PCIe Solutions Manuel d'utilisateur
(184 pages)
(184 pages)
Instruments de mesure Altera 10-Gbps Ethernet MAC MegaCore Function Manuel d'utilisateur
(175 pages)
(175 pages)
Instruments de mesure Altera Triple Speed Ethernet MegaCore Function Manuel d'utilisateur
(223 pages)
(223 pages)
© 2020, manymanuals.fr. Tous droits réservés | 0.034 s |
Manymanuals.com
Manymanuals.de
Manymanuals.fr
Manymanuals.it
Manymanuals.pl
Manymanuals.cz
Manymanuals.es
Manymanuals-pt.com
Commentaires sur ces manuels