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6.18 3-Port Ethernet Switch Subsystem (3PSW)

TMS320DM647/TMS320DM648

Digital Media Processor

SPRS372 – MAY 2007

The Ethernet module controls the flow of packet data between the DM648/DM647 device and two external

Ethernet PHYs (DM648 only) or one external Ethernet PHY (DM647 only), with hardware flow control and

quality-of-service (QOS) support. See Figure 6-42 for a block diagram of the Ethernet module. The

Ethernet Subsystem contains a 3-port gigabit switch, where one port is internally connected to the C64x+

DSP (via the switched central resource) and the other two ports are brought out externally. Each of the

external Ethernet ports support the modes shown in Table 6-63.

Table 6-63. Ethernet Operating Modes

Description

Data Rate

Operating Mode

10Base-T

10 Mbits/second (Mbps)

half- or full-duplex

100Base-T

100 Mbits/second (Mbps)

half- or full-duplex

1000Base-T

1000 Mbits/second (Mbps)

full-duplex

The Ethernet Subsystem provides these functions:

• Ethernet communication/routing by way of two dedicated 10/100/1000 ports with SGMII interfaces

–

Wire-rate switching (802.1d), non-blocking switch fabric

–

Four priority levels of QoS TX support (802.1p) in hardware

–

Programmable interrupt pacing on RX/TX plus interrupt threshold on RX

–

Supports forwarding frame sizes of 64-2020 bytes

• Address Lookup

–

1024 total address lookup engine (ALE) entries of VLANs and/or MAC addresses

–

L2 address lock and L2 filtering support

–

Multicast/broadcast filtering and forwarding state control

–

Receive-based or destination-based multicast and broadcast rate limits

–

MAC address blocking

–

Source port locking

–

OUI (Vendor ID) host accept/deny feature

–

Host controlled time-based aging

–

MAC authentication (802.1x)

–

Remapping of priority level of VLAN or ports

–

Multiple spanning tree support (spanning tree per VLAN)

• 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

–

Flow control (IEEE 802.3x)

–

Programmable priority escalation to specify delivery of lower priority level packets in the event of

over-subscribed TX high priority traffic

–

Host pass CRC mode (enables CRC protection through host)

–

Write-protect option for Ethernet module registers (3PGSW, CPPI RAM, MDIO, SGMII0, SGMII1,

control)

–

Ethernet statistics:

• EtherStats and 802.3 Stats RMON statistics gathering (shared)

• Programmable statistics interrupt mask when a statistic is above one half its 32-bit value

–

MDIO module for PHY management

–

SGMII gigabit current mode logic (CML) differential SERializer/DESerializer (SerDes) I/O

receiver/transmitters

Peripheral Information and Electrical Specifications

144

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