The TC3097 Lite End Multiport Repeater Interface
Controller (LEMRIC) may be used to implement an IEEE 802.3 multiport
repeater unit. It fully satisfies the IEEE 802.3 repeater specification
including the functions defined by the repeater, segment partition
and jabber lockup protection state machines.
The LEMRIC has an on-chip phase-locked-loop (PLL)
for Manchester data decoding, a Manchester encoder, and an Elasticity
Buffer for preamble regeneration. In addition, it provides direct
LED display driver pins for per port LINK/RCV status, per port partition
jabber status, global jam and jabber lockup status indications.
Each LEMRIC can connect up to 9 cable segments
via its network interface ports. One port is fully Attachment Unit
Interface (AUI) compatible and is able to connect to an external
Medium Attachment Unit (MAU) using the maximum length of AUI cable.
The other 8 ports have integrated 10BASE-T transceivers. In addition,
large repeater units may be constructed by cascading LEMRICs together
over the Inter-LEMRIC bus.
Functionally conforms to Section 9 in the IEEE
9 network connection (ports) per chip including:
- 1 AUI PORT with fully compatible and drive capability (50m
- 8 TP PORT with fully compatible and drive capability (100m
Cascadable for large multiple LEMRIC hub applications.
On-chip Elasticity buffer, Manchester encoder
Separate partition state machine for each port.
Embeded LED output driver for each port partition
status, each port link/receive status (TP port), global jam
status, and global jabber status. No external glue logic is
Embedded predistortion resistors for every TP
Build in power reset circuit, no extra glue logic
Crystal/Oscillator optional applicable.
Manchester code violation detection and reporting.
Support MAU Jabber Lockup Protection function.
Support Auto Partition/Reconnection function to isolate a faulty
segment' s collision activity.
Fully integrated Link Test logic with enable/disable
option, conforming to the 10BASE-T standard.
Fully integrated polarity detect/correct logic
with enable/disable option for per TP port.
Low power consumption; fully load < 900 mW.
CMOS device feature high integration with a single
+ 5V supply.
100-pin QFP package.