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3X38FTR データシート(PDF) 5 Page - Agere Systems

部品番号 3X38FTR
部品情報  OCTAL-FET (Fast Ethernet Transceiver) for 10Base-T/100Base-TX/FX
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Lucent Technologies Inc.
5
Preliminary Data Sheet
3X38FTR 208-Pin SQFP
September 2000
OCTAL-FET for 10Base-T/100Base-TX/FX
Description
RMII Mode
The reduced media independent interface (RMII) is a
low pin count interface specification promulgated by the
RMII consortium. This specification reduces the total
number of pins from 16 for the
IEEE 802.3U MII inter-
face to seven for the RMII. Architecturally, the RMII
specification provides for an additional reconciliation
sublayer on either side of the MII but, in the 3X38, has
been implemented in the absence of the MII.
The management interface (MDIO/MDC) remains iden-
tical to that defined in
IEEE 802.3u.
The RMII specification has the following characteris-
tics:
s
It supports 10 Mbits/s and 100 Mbits/s data rates.
s
A single 50 MHz clock reference is sourced from
MAC to PHY or from an external shared source.
s
It provides independent 2-bit wide transmit and
receive data paths.
SMII Mode
The serial media independent interface (SMII) is a low
pin count interface specification promulgated by
Cisco*. This specification reduces the total number of
pins from 16 for the
IEEE 802.3u MII interface to two for
the SMII. Architecturally, the SMII specification pro-
vides for an additional reconciliation sublayer on either
side of the MII but, in the 3X38, has been implemented
in the absence of the MII.
The management interface (MDIO/MDC) remains iden-
tical to that defined in
IEEE 802.3u.
The SMII specification has the following characteristics:
s
It supports 10 Mbits/s and 100 Mbits/s data rates.
s
A single 125 MHz clock reference is sourced from
MAC to PHY or from an external shared source.
s
It provides independent serial transmit and receive
data paths.
LED Control
LEDs can be accessed in one of the following modes:
s
Serial mode. In this mode, all of the LEDs are time-
division multiplexed onto one pin, with a second pin
acting as the clock and a third as a strobe. All LEDs
and all channels share the same pins.
s
Parallel mode. In this mode, each LED and each
channel has its own pin. There is a total of four LED
pins per channel for a total of 32 pins.
s
Bicolor mode. In this mode, each channel has two
outputs to control a bicolor LED. One LED can be
used for each port, indicating link and activity.
In all modes, the LEDs can be operated as
follows:
s
LED stretch.
s
LED blink.
s
No stretch or blink.
Clocking
The 3X38 operates with a 50 MHz clock input when in
the RMII mode, and with a 125 MHz clock input when
in the SMII mode.
FX Mode
Each individual port of the 3X38 can be operated in
100Base-FX mode by selecting it through the pin pro-
gram option (FX_MODE_EN[7:0]), or through the reg-
ister bit (register 29, bit 0).
When operating in FX mode, the twisted-pair I/O pins
are reused as the fiber-optic transceiver I/O data pins,
and the fiber-optic signal detect (FOSD) inputs are
enabled.
When a port is placed in FX mode, it will automatically
configure the port for 100Base-FX operation (and the
register bit control will be ignored) such that:
s
The far-end fault signaling option will be enabled.
s
The MLT-3 encoding/decoding will be disabled.
s
Scrambler/descrambler will be disabled.
s
Autonegotiation will be disabled.
s
The signal detect inputs will be activated.
s
10Base-T will be disabled.
*
Cisco is a registered trademark of Cisco Systems.


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