IP-10GETHERNET Altera, IP-10GETHERNET Datasheet - Page 53

• Manufacturer Part Number: IP-10GETHERNET
• Description: IP CORE - 10 Gbps Ethernet MAC PCS PMA Reference Design
• Manufacturer: Altera

Specifications of IP-10GETHERNET

• Software Application: IP CORE, Interface And Protocols, ETHERNET
• Supported Families: Quartus II
• Core Architecture: FPGA
• Core Sub-architecture: Stratix
• Rohs Compliant: NA
• Lead Free Status / RoHS Status: na

Congestion and Flow Control Using Pause Frames
3.4.3. Link Fault Signaling
3.4.4. Modes of Operations
© July 2010 Altera Corporation
Altera’s 10-Gbps Ethernet MAC includes a reconciliation sublayer (RS) that handles
local and remote faults. The RS functionality is included in the MAC module. When
the local PHY reports a local fault by sending 0x9c00000001 control characters, the RS
starts sending the remote fault signal (0x9c0000002) to the PHY which is eventually
received by the remote link partner. Similarly, when the local device receives a remote
fault control character, the RS transmits idle control characters. Once normal data is
received by the Rx, RS, and MAC/RS modules, the Tx module resumes sending
Ethernet frames carrying client data.
When local or remote fault signals are received by local RS, it sets the appropriate bit
in the rx_link_fault status register. The msb records the remote fault status and
lsb records the local fault status. These status bits are not sticky. Once a fault condition
disappears and normal data traffic is received for more than 127 columns, these fault
status bits are cleared. When the RS starts sending Remote Fault/IDLE, the data sent
by the Mac Tx is ignored. All data sent by the Tx is lost.
fault signaling.
Figure 3–24. Fault Signalling
Note to
(1) Tx RS sends a remote fault (RF) or idle respectively when Rx RS receives a local fault (LF) or remote fault (RF).
You can configure the Altera MAC datapath for different modes of operation. The
following sections describe these options.
3.4.4.1. Regular Mode
This is the normal mode of operation when the Altera MAC transmits and receives
data to and from a remote link partner MAC. It is also called the filtered or
non-promiscuous mode of operation. In this mode, MAC Tx performs all enabled
functions on client data and transmits on the physical media. The Rx MAC performs
address filtering, various header checking, and control frame termination as per the
IEEE 802.3 standard. The following functions are available in the regular mode:
Figure
3–24:
Interface
Client
MAC
MAC
Rx
Tx
2
Tx RS
Rx RS
rx_link_fault
2’b01/2’b10
RF/IDLE
10-Gbps Ethernet IP Functional Description
LF/RF
Figure 3–24
Interface
Network
illustrates the
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