參數(shù)資料
型號： TMX320DM647ZUT720
廠商： Texas Instruments, Inc.
英文描述： Digital Media Processor
中文描述： 數(shù)字媒體處理器
文件頁數(shù)： 144/166頁
文件大?。?/td> 1341K
代理商： TMX320DM647ZUT720
www.ti.com
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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
10Base-T
100Base-T
1000Base-T
Data Rate
10 Mbits/second (Mbps)
100 Mbits/second (Mbps)
1000 Mbits/second (Mbps)
Operating Mode
half- or full-duplex
half- or full-duplex
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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