參數(shù)資料
型號(hào)： LU3X54FT
英文描述： QUAD-FET (Fast Ethernet Transceiver) for 10Base-T/100Base-TX/FX
中文描述： 四場(chǎng)效應(yīng)管（快速以太網(wǎng)收發(fā)器）的10Base-T/100Base-TX/FX
文件頁(yè)數(shù)： 28/54頁(yè)
文件大?。?/td> 677K
代理商： LU3X54FT
LU3X54FT
QUAD-FET for 10Base-T/100Base-TX/FX
Data Sheet
July 2000
28
Lucent Technologies Inc.
203
RESET
I
Full Chip Reset.
Reset must be asserted high for at least five LSCLK
cycles. The LU3X54FT will come out of reset after 400
μ
s. LSCLK must
remain running during reset.
Half-Duplex LED[B].
When this output is high, it indicates half-duplex
mode. When it is low, it indicates full duplex. External buffers are nec-
essary to drive the LEDs. This output is only valid when the link is up.
Carrier Sense Select.
At powerup, this pin may be used to select the
mode of CRS operation. When this pin is pulled high through a 4.7 k
resistor, CRS will be asserted on receive activity only. This is the same
function as register 29, bit 10.
199
H_DUPLED[B]/
CRS_SEL
I/O
This pin has an internal 50 k
pull-down resistor for normal mode oper-
ation (default: CRS asserted on transmit or receive activity). This input
and the register bit [29.10] are ORed together during powerup and
reset.
Half-Duplex LED[C].
When this output is high, it indicates half-duplex
mode. When low, it indicates full duplex. External buffers are necessary
to drive the LEDs. This output is only valid when the link is up.
Serial Select.
At powerup, this pin may be used to set the
SERIAL_SEL function of register 30, bit 1 for all four channels by pull-
ing it high through a 4.7 k
resistor if station management is unavail-
able.
200
H_DUPLED[C]/
SERIAL_SEL
I/O
This pin has an internal 50 k
pull-down resistor for normal mode oper-
ation (default). This input and the register bit [30.1] are ORed together
during powerup and reset.
No Connect.
Do not connect these pins.
54
NC
—
Pin Information
(continued)
Pin Descriptions
(continued)
Table 7. Miscellaneous Pins
(continued)
Pin
Signal
Type
Description
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