參數(shù)資料
型號： 9883
廠商： Intel Corp.
英文描述： Advanced 10/100 Umnmanaged Repeater
中文描述： 高級10/100 Umnmanaged直放站
文件頁數(shù)： 16/56頁
文件大小： 719K
代理商： 9883
LXT9883/9863
—
Advanced 10/100 Unmanaged Repeater
16
Datasheet
Document #: 249115
Revision #: 003
Rev. Date: 08/07/01
3.0
Functional Description
3.1
Introduction
As a fully integrated IEEE 802.3 compliant repeater capable of 10 Mbps and 100 Mbps operation,
the LXT98x3 is a versatile device allowing great flexibility in Ethernet design solutions.
Figure 3
shows a typical application. Refer to
"Application Information”
on page 32.
for specific circuit
implementations.
102
RBIAS
A
RBIAS.
Used to provide bias current for internal circuitry. The 100
μ
A bias
current is provided through an external 22.1 k
,
1%
resistor to GND.
79
RPS_PRES
I
PD
Redundant Power Supply Present.
Active High input indicates presence of
redundant power supply. Tie Low if not used.
78
RPS_FAULT
I
PU
Redundant Power Supply Fault. Active Low input indicates redundant power
supply fault. The state of this input is reflected in the RPS_LED output (refer to
LED section). Tie High if not used.
Table 7. Miscellaneous Signal Descriptions
Pin
Symbol
Type
1, 2
Description
53
RESET
I
Schmitt
Reset.
This active Low input causes internal circuits, state machines and
counters to reset (address tracking registers do not reset). On power-up,
devices should not be brought out of reset until the power supply stabilizes to
3.3V. When there are multiple devices, it is recommended all be supplied by
a common reset driven by an
‘
LS14 or similar device.
54
CLK25
I
Schmitt
25 MHz system clock.
Refer to
Table 21 on page 44.
72
FPS
I
TTL
First Position Select.
In multi-chip configurations, this pin identifies one
device on each board that drives the HOLDCOL signal to extend non-local
collisions to other devices on the board. Set Low for first device on the PCB.
Set High for all other devices on the PCB.
25, 33, 51, 52,
55-60, 63-71,
73, 178, 182,
198, 201
N/C
-
No Connects.
Leave these pins unconnected.
1. I = Input, O = Output, I/O = Input/Output, D = Digital, A = Analog, AI = Analog Input, A I/O = Analog Input/Output, OD = Open
Drain,
OS = Open Source, PD = Pull Down, PU = Pull Up.
NC = No Clamp. Pad does not clamp input in the absence of power.
2. Pins are 5V tolerant, unless indicated.
Table 6. Power Supply and Indication Signal Descriptions (Continued)
Pin
Symbol
Type
1, 2
Description
1. I = Input, O = Output, I/O = Input/Output, D = Digital, A = Analog, AI = Analog Input, A I/O = Analog Input/Output, OD = Open
Drain,
OS = Open Source, PD = Pull Down, PU = Pull Up.
NC = No Clamp. Pad does not clamp input in the absence of power.
2. Pins are 5V tolerant, unless indicated.
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