TXC-06885BIOG Transwitch Corporation, TXC-06885BIOG Datasheet - Page 74

• Manufacturer Part Number: TXC-06885BIOG
• Manufacturer: Transwitch Corporation

Specifications of TXC-06885BIOG

• Operating Supply Voltage (typ): 1.8/3.3V
• Operating Temperature Classification: Industrial
• Package Type: BGA
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Not Compliant

Envoy-CE4 Device
DATA SHEET
TXC-06885
7 4 o f 12 8
6.3 PORT AGGREGATION
In Port Aggregation mode, the Envoy-CE4 aggregates all the Ethernet ports’ receive data
onto a single SPI-3 port. Port Aggregation mode may be programmed in SPI-3 Multi-PHY
mode or SPI-3 Single-PHY mode. In Multi-PHY mode, all the Ethernet ports aggregate traffic
onto SPI-3 port 0. A round robin mechanism schedules traffic from multiple Ingress FIFOs
(per Port Ingress FIFOs) onto a single SPI-3 Port. Port Aggregation in Single-PHY mode is
similar to the above except that there is no concept of a SPI-3 port and hence no SPI-3 port
address. The Envoy-CE4 emulates a single PHY/Link layer device in Single-PHY operation.
A programmable port number is appended to the packet or chunk (depending on whether the
device is in burst mode or not). The programmable port number may be used by the
downstream device to identify the source of the packet from the Envoy-CE4 Ethernet
interface.
In the SPI-3 receive to Ethernet Transmit direction, a prepended port number is required to
de-multiplex the incoming packet stream on SPI-3 port 0 onto multiple Ethernet ports. The
port number is assigned from 0 to 31 and a byte of packet data is used to convey this
information. The appended port number will be removed before transmission onto the
appropriate Ethernet interface.
• Total number of frames transmitted. This includes all frames, broadcast and multicast (32 bit)
• Count of Multicast frames transmitted (32 bit)
• Count of Broadcast frames transmitted (32 bit)
• Count of PAUSE Control frames transmitted (32 bit)
• Count of VLAN tagged frames transmitted (32 bit)
• Count of frames transmitted with a valid FCS and total byte count is between 1519 and
• Count of frames transmitted with a valid FCS and length less than 64 bytes (32 bit)
• Count of deferred frames transmitted (32 bit)
• Count of excessive deferred frames transmitted (32 bit)
• Count of single collision frames (32 bit)
• Count of multiple collision frames (32 bit)
• Count of late collision frames (32 bit)
• Count of excessive collision frames (32 bit)
• Count of frames transmitted with an invalid FCS and length less than 64 bytes (32 bit)
• Count of frames transmitted with an invalid FCS and total byte count is between 1519
• Count of frames transmitted with an invalid FCS and total byte count is between 64 and
• Count of dropped frames due to lack of system resources (32 bit)
• Count of aborted frames under command of the Egress FIFO logic (32 bit)
• Six sets of counts for frame sizes that fall in a certain range. The ranges are 64 bytes, 65
• Count of PAUSE frames originated via SPI-3 interface that are discarded (32 bit)
maximum frame length (32 bit)
and maximum frame length (32 bit)
1518 bytes (32 bit)
to 127 bytes, 128 to 255 bytes, 256 to 511 bytes, 512 to 1023 bytes, and 1024 to 1518
bytes.
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Operation
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PRELIMINARY TXC-06885-MB, Ed. 6A
February 2005