MX98745 Datasheet, PDF (1/36 Pages) List of Unclassifed Manufacturers – 100 BASE-TX/FX REPEATER CONTROLLER

PRELIMINARY
MX98745
100 BASE-TX/FX
REPEATER CONTROLLER
1.0 FEATURES
• IEEE 802.3u D5 repeater and management compatible
• Support 7 TX/FX ports and 1 universal port (TX or MII
port selectable)
• Support 8-scale utilization and collision rate LED display
• Asynchronous Expansion port clock supported for
easily stackable application
• Separate jabber and partition state machines for each
port
• On-chip elasticity buffer for PHY signal re-timing to the
MX98745 clock source
• Contents of internal register loaded from EEPROM
• PCS/MAC type MII interface selectable
• CMOS device features high integration and low power
with a signle +5V supply
2.0 GENERAL DESCRIPTION
The MX98745, Second generation 100 Mb/s TX/FX Hub
Controller (XRC II), is designed specifically to meet the
needs of today's high speed Fast Ethernet networking
systems. The MX98745 is fully IEEE 802.3u D5 clause
27 repeater compatible.
Difference from MX98741, which provides 8 dedicated
TX/FX ports and 3 MII ports, MX98745 support 7 dedi-
cated TX/FX ports and one programmble TX/FX/MII port.
Whenever MII port is programmed, MX98745 also sup-
ports the flexibility to make user can easily select PCS or
MAC type MII for system application. With this program-
mable MII interface, user can easily connect MX98745 to
MX98742 (Bridge), or T4 transceiver. Or user can use
this programmable MII interface to connect to either MAC
or PCS type data transceiver.
All contents of internal registers are loaded from
EEPROM in MX98745. If system application prefers
default setting instead of using contents from EEPROM,
EEPROM operation can be disabled by setting EECONF
to low. This feature faciliates system modulization appli-
cation.
8 scale of utilization LED is also provided by MX98745.
They are 1%, 3%, 5%, 10%, 20%, 40%, 60% and 80+%.
The defination for utiliztion is Mbs Received/100 Mb within
one second sampling period. Meanwhile, RX/LINK, Par-
tition, Isolation and Collision status are also provided
through LED display.
A great improvement in MX98745 (compared to
MX98741) is that it also provides "synchronous expan-
sion port data transfer mode" to make stackable design
more easier.
P/N:PM0427
REV. 1.4, JUL. 8, 1998
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