TXC-06880BIOG Transwitch Corporation, TXC-06880BIOG Datasheet - Page 60

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TXC-06880BIOG

Manufacturer Part Number
TXC-06880BIOG
Description
Manufacturer
Transwitch Corporation
Datasheet

Specifications of TXC-06880BIOG

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

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Manufacturer
Quantity
Price
Part Number:
TXC-06880BIOG
Manufacturer:
SAMWHA
Quantity:
34 000
Envoy-CE2 Device
DATA SHEET
TXC-06880
6 0 o f 12 2
6.1.3 Receive MAC Statistics
6.1.2.4 Interframe Gap Check:
6.1.2.5 Destination Address Check:
6.1.3.1 Counters:
truncated. Truncated frames are optionally discarded or errored if the Discard Truncated
Frame configuration bit is set (Register 0x4084 Bit 24). The maximum frame size check is
disabled by setting the Huge Frame Enable configuration bit (Register 0x4004 Bit 5).
When the IFIFO is configured for Store and Forward mode, the frame is discarded and will
not show up on the SPI port. When the IFIFO is configured for Streaming mode, a bad FCS is
appended to the frame.
The Interframe Gap (IFG) is programmable. A received Ethernet frame violating the
programmed Interframe gap value is dropped or errored. The default value of the Minimum
IFG is 80 (decimal) bits.
When the IFIFO is configured for Store and Forward mode, the frame is discarded and will
not show up on the SPI port. When the IFIFO is configured for Streaming mode, a bad FCS is
appended to the frame.
The Destination address of the received Ethernet frame is compared to the programmed
Source address of the device. If the destination address of the frame does not match the
programmed source address, the frame will be optionally filtered out based on the Destination
Address match discard configuration bit (Register 0x4084 Bit 29).
When the IFIFO is configured for Store and Forward mode, the frame is discarded and will
not show up on the SPI port. When the IFIFO is configured for Streaming mode, a bad FCS is
appended to the frame.
Note: When an incoming frame (from the Ethernet side) fails all the checks above (except for
FCS) and the corresponding configuration bits to discard the frame are NOT SET, the frame
will be output on the SPI-3 Receive Interface. The only requirement on the incoming frame for
the above to occur, is that the incoming frame has a valid preamble, SFD, and FCS.
The Receive MAC provides statistics and performance monitoring, to facilitate remote
network monitoring (RMON) per Groups 1, 2, 3, and 9, in addition to supplementary statistics.
The MAC records the following statistics using counters that are programmable as either
clear on read saturating counters or rollover counters (Register 0x0030 Bit 0).
• Total number of bytes received. This counter can be programmed to exclude byte counts
• Total number of frames received. This includes errored frames (32 bit)
• Count of Multicast frames received (32 bit)
• Count of Broadcast frames received (32 bit)
• Count of PAUSE Control frames received (32 bit)
• Count of Control frames received with unknown opcode (32 bit)
• Count of frames received with a valid FCS and length less than 64 bytes (32 bit)
• Count of frames received with a valid FCS and total byte count is between 1519 and
from errored frames (40 bit)
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Operation
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PRELIMINARY TXC-06880-MB, Ed. 4
February 2005

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