5-4
MC92603 Quad Gigabit Ethernet Transceiver Reference Manual
MOTOROLA
Repeater Mode
5.5
Repeater Mode
The MC92603 may be configured into a two-link receive-transmit repeater by setting the
repeater mode enable, REPE, signal high. In repeater mode, data received on link A’s
receiver is forwarded to link A’s transmitter and link B’s receiver to link B’s transmitter.
The configuration inputs may be used to control how the repeater handles the data as it
passes through the repeater. Certain configurations are more effective than others for
various applications. The transmitter at the source, the receiver at the destination, and the
repeater must have compatible configurations to ensure proper operation. The following
sections describe how each configuration control affects the repeater operation.
NOTE
The primary purpose of this mode is to facilitate bit error rate
testing with the test data driven into GEt through the receiver
serial links and then is sent back to the BERT tester through the
transmitter serial links.
This mode does not attempt to meet the standard for Ethernet
repeaters as defined in Clause 41 of IEEE Std. 802.3-2002 [4].
5.5.1
Ten-Bit Interface Mode
When the device is in 10-bit interface mode (TBIE = high), the internal 8B/10B encoder
and decoder are bypassed and the 10-bit data received is forwarded directly to the
transmitter. Running disparity is assumed correct and is not checked.
When byte interface mode is enabled (TBIE = low), received data is passed through the
8B/10B decoder where it is converted into its 8-bit data or a control byte. Running disparity
and code validity are checked and reported with the received byte at the receiver interface,
as described in Section 3.8.1, “Byte Mode (Uncoded Data).” The decoded byte is re-coded
by the transmitter’s 8B/10B encoder for transmission.
5.5.2
Byte Alignment Mode
Byte alignment mode must be enabled (BSYNC = high) for repeater mode.
When establishing byte alignment for the link through the repeater, the byte alignment
sequence must be repeated twice:
•
Once for the repeater
•
Once for the destination’s receiver
At least eight IDLE code groups must be transmitted, four for the repeater’s receiver
alignment and four for the destination’s receiver alignment.
Summary of Contents for MC92603
Page 18: ...xviii MC92603 Quad Gigabit Ethernet Transceiver Reference Manual MOTOROLA ...
Page 26: ...1 8 MC92603 Quad Gigabit Ethernet Transceiver Reference Manual MOTOROLA References ...
Page 116: ...A 2 MC92603 Quad Gigabit Ethernet Transceiver Reference Manual MOTOROLA ...
Page 126: ...C 2 MC92603 Quad Gigabit Ethernet Transceiver Reference Manual MOTOROLA ...
Page 130: ...Glossary 4 MC92603 Quad Gigabit Ethernet Transceiver Reference Manual MOTOROLA ...