Xilinx LOGICORE UG144 Manuel d'utilisateur Page 48
- Page / 138
- Table des matières
- MARQUE LIVRES
Noté. / 5. Basé sur avis des utilisateurs
48 www.xilinx.com 1-Gigabit Ethernet MAC v8.5 User Guide
UG144 April 24, 2009
Chapter 5: Using the Client Side Data Path
R
-- DISCONTINUED PRODUCT --
Client-Supplied FCS Passing
The transmission timing depicted in Figure 5-7 shows the GEMAC core configured to have
the FCS field passed in by the client. In this case, it is the responsibility of the client to
ensure that the frame meets the Ethernet minimum frame length requirements as the
GEMAC core will not perform any padding of the payload. See “Configuration Registers,”
on page 78.
Client Underrun
Figure 5-8 illustrates the timing of an aborted transfer. An example of this situation is a
FIFO connected to the client interface that empties before a frame transfer is complete.
When the client asserts tx_underrun during a frame transmission, the GEMAC core
inserts an error code to corrupt the current frame, and then falls back to idle transmission.
It is the responsibility of the client to re-queue the aborted frame for transmission.
When an underrun occurs, tx_data_valid may be asserted on the clock cycle after the
tx_underrun assertion to request a new transmission.
Figure 5-7: Frame Transmission with Client-supplied FCS
gtx_clk
tx_data[7:0]
tx_data_valid
tx_ack
tx_underrun
DA SA DATA FCS
L/T
Figure 5-8: Frame Transmission with Underrun
gtx_clk
tx_data[7:0]
tx_data_valid
tx_ack
tx_underrun
DA SA DATA
L/T
- LogiCORE™ IP 1
- 1-Gigabit Ethernet 1
- MAC v8.5 1
- Revision History 3
- Table of Contents 5
- Appendix D: Core Latency 8
- Schedule of Figures 9
- UG144 April 24, 2009 10
- Schedule of Tables 13
- About This Guide 15
- Conventions 16
- Online Document 17
- List of Acronyms 17
- Introduction 19
- Specifications 20
- Technical Support 20
- Feedback 20
- Core Architecture 21
- Core Components 22
- Core Interfaces 23
- Client Side Interface 26
- Receiver Interface 27
- Flow Control Interface 27
- Physical Side Interface 29
- MDIO Interface 30
- Generating the Core 31
- Component Name 32
- Management Interface 32
- Address Filter 32
- Physical Interface 32
- Output Generation 33
- Designing with the Core 35
- Know the Degree of Difficulty 37
- Keep it Registered 38
- Use Supported Design Flows 38
- Chapter 5 39
- Frame Reception with Errors 41
- Client-Supplied FCS Passing 42
- VLAN Tagged Frames 42
- Disabled 43
- Receiver Statistics Vector 44
- Transmitting Outbound Frames 47
- Client Underrun 48
- Inter-Frame Gap Adjustment 49
- Transmitter Statistics Vector 50
- Using Flow Control 53
- Flow Control Basics 54
- Pause Control Frames 55
- Core-initiated Pause Request 56
- Pause Frame Reception Enabled 57
- Operation 59
- Chapter 6: Using Flow Control 60
- Chapter 7 61
- GMII Receiver Logic 63
- DCM Reset circuitry 64
- IOB LOGIC 66
- Virtex-4 Devices 67
- RGMII Receiver Logic 70
- Implementing External RGMII 71
- Using the MDIO interface 76
- Configuration and Status 77
- Configuration Registers 78
- Receiver Configuration 79
- Transmitter Configuration 80
- Flow Control Configuration 81
- MDIO Configuration 82
- Address Filter Configuration 82
- Accessing the Address Table 85
- LOCATION 86
- 31 : 0 47 : 32 86
- IDLE IDLE32 bits 87
- STA drives MDIO 87
- Constraining the Core 93
- MDIO Logic 94
- Flow Control 95
- Configuration 95
- "reset_dist_grp"; 96
- GMII Input Setup/Hold Timing 97
- Non-Virtex-5 devices 99
- RGMII IOB Constraints 101
- RGMII Input Setup/Hold Timing 102
- Virtex-5 Devices 103
- RGMII DDR Constraints 104
- Non-Virtex-5 Devices 105
- -- DISCONTINUED PRODUCT 108
- Clocking and Resetting 109
- Multiple Cores 110
- With RGMII 111
- Reset Conditions 112
- Interfacing to Other Cores 113
- Tra ns ce i ve r 115
- Virtex-5 LXT and SXT Devices 117
- Virtex-5 FXT Devices 118
- Ethernet Statistics Core 119
- Implementing Your Design 123
- Implementation 124
- Static Timing Analysis 125
- Generating a Bitstream 125
- Generating a Simulation Model 125
- Using the Model 126
- Using the Client-Side FIFO 127
- Interfaces 128
- Receive FIFO 129
- Data Flow 130
- Functional Operation 131
- Expanding Maximum Frame Size 132
- Interoperability 133
- Appendix C 135
- Core Latency 137
- Appendix D: Core Latency 138
© 2020, manymanuals.fr. Tous droits réservés | 0.045 s |
Manymanuals.com
Manymanuals.de
Manymanuals.fr
Manymanuals.it
Manymanuals.pl
Manymanuals.cz
Manymanuals.es
Manymanuals-pt.com
Commentaires sur ces manuels