19.8.1.1 Features
The GMAC_SW subsystem provides the following features:
• Two Ethernet ports (port 1 and port 2) with RGMII interfaces plus internal Communications Port
Programming Interface (CPPI 3.1) on port 0
• Synchronous 10/100/1000 Mbit operation
• Wire rate switching (802.1d)
• Non-blocking switch fabric
• Flexible logical FIFO-based packet buffer structure
• Four priority level Quality Of Service (QOS) support (802.1p)
• CPPI 3.1 compliant DMA controllers
• Support for Audio/Video Bridging (P802.1Qav/D6.0)
• Support for IEEE 1588 Clock Synchronization (2008 Annex D and Annex F)
– Timing FIFO and time stamping logic embedded in the subsystem
• Device Level Ring (DLR) Support
• Energy Efficient Ethernet (EEE) support (802.3az)
• Flow Control Support (802.3x)
• Address Lookup Engine (ALE)
– 1024 total address entries plus VLANs
– Wire rate lookup
– Host controlled time-based aging
– Multiple spanning tree support (spanning tree per VLAN)
– L2 address lock and L2 filtering support
– MAC authentication (802.1x)
– Receive-based or destination-based multicast and broadcast rate limits
– MAC address blocking
– Source port locking
– OUI (Vendor ID) host accept/deny feature
– Remapping of priority level of VLAN or ports
• VLAN support
– 802.1Q compliant
• Auto add port VLAN for untagged frames on ingress
• Auto VLAN removal on egress and auto pad to minimum frame size
• Ethernet Statistics:
– EtherStats and 802.3Stats Remote network Monitoring (RMON) statistics gathering (shared)
– Programmable statistics interrupt mask when a statistic is above one half its 32-bit value
• Flow Control Support (802.3x)
• Digital loopback and FIFO loopback modes supported
• Maximum frame size 2016 bytes (2020 with VLAN)
• 8k (2048 × 32) internal CPPI buffer descriptor memory
• Management Data Input/Output (MDIO) module for PHY Management
• Programmable interrupt control with selected interrupt pacing
• Emulation support
• Programmable Transmit Inter Packet Gap (IPG)
• Reset isolation (switch function remains active even in case of all device resets except for POR pin
reset and ICEPICK cold reset)
• Full duplex mode supported in 10/100/1000 Mbps. Half-duplex mode supported only in 10/100 Mbps.
• IEEE 802.3 gigabit Ethernet conformant
Terminology:
AVB— Audio Video Bridging
AVBTP— Audio Video Bridging Trasport Protocol
BMCA— Best Master Clock Algorithm
CFI— Canonical Format Indicator
CPPI— Communications Port Programming Interface
DLR— Device Level Ring
DSCP— Differentiated Services Code Point
EEE— Energy Efficient Ethernet
EMAC— Ethernet Media Access Control
EOP— End of Packet
EOQ— End of Queue
IPG— Inter-Packet Gap
LPI— Low Power Indicator
MDIO— Management Data Input/Output
MOF— Middle of Frame
PTP— Precision Time Protocol
RMON— Remote Monitoring
RTCP— RTP Control Protocol
RTP— Real-time Transport Protocol
SCR— Switched Central Resource
SRP— Stream Reservation Protocol
TOS— Type of Service
VLAN— Virtual Local Area Network
Figure 19-157 shows a device with integrated CPSW and MDIO interfaced via a RGMII connection in a typical system. The individual CPSW and MDIO signals for the RGMII interface are summarized in
Table 19-779.
