參數(shù)資料
型號(hào)： 9863
廠商： Intel Corp.
英文描述： Advanced 10/100 Umnmanaged Repeater
中文描述： 高級(jí)10/100 Umnmanaged直放站
文件頁(yè)數(shù)： 12/56頁(yè)
文件大?。?/td> 719K
代理商： 9863
LXT9883/9863
—
Advanced 10/100 Unmanaged Repeater
12
Datasheet
Document #: 249115
Revision #: 003
Rev. Date: 08/07/01
10 Mbps IRB Signals
11
IR10DAT
I/O
OD
PD
10 Mbps IRB Data.
This bidirectional signal carries data on the 10 Mbps IRB. Data is
driven and sampled on the rising edge of the corresponding IRCLK. This signal must be
pulled High by a 330
resistor. Buffer this signal between boards.
12
IR10CLK
I/O
Tri-state
Schmitt
PD
10 Mbps IRB Clock.
This bidirectional, non-continuous, 10 MHz clock is recovered
from received network traffic. During idle periods, the output is high-impedance. Schmitt
triggering is used to increase noise immunity.
6
IR10DEN
O
OD
10 Mbps IRB Driver Enable.
This output provides directional control for an external
bidirectional transceiver (74LVT245) used to buffer the IRBs in multi-board applications.
It must be pulled up by a 330
resistor. When there are multiple devices on one board,
tie all IR10DEN outputs together. If IR10DEN is tied directly to the DIR pin on a
74LVT245, attach the on-board IR10DAT, IR10CLK and IR10ENA signals to the
“
B
”
side
of the 74LVT245, and connect the off-board signals to the
“
A
”
side of the 74LVT245.
10
IR10ENA
I/O
OD
PU
10 Mbps IRB Enable.
This active Low output indicates carrier presence on the IRB. A
330
pull-up resistor is required to pull the IR10ENA output High when the IRB is idle.
When there are multiple devices, tie all IR10ENA outputs together. Buffer these
signals between boards.
3
IR10COL
I/O
OD
PU
10 Mbps IRB Collision.
This output is driven Low to indicate a collision occurred on the
10 Mbps segment. A 330
resistor is required on each board to pull this signal High
when there is no collision. Do not connect between boards and do not buffer.
4
IR10COLBP
I/O
OD
10 Mbps IRB Collision - Backplane.
This active Low output has the same function as
IR10COL, but is used between boards. Attach this signal only from the device with FPS
= 0 to the backplane or connector,
without buffering
. The output must be pulled up by
one 330
resistor per stack.
2
IR10CFS
4
A, I/O
OD
10 Mbps IRB Collision Force Sense.
This three-state analog signal indicates transmit
collision when driven Low. IR10CFS requires a 215
, 1% pull-up resistor. Do not
connect this signal between boards and do not buffer.
5
IR10CFSBP
A I/O
OD
Note:
10 Mbps IRB Collision Force Sense - Backplane.
Functions the same as
IR10CFS, but connects between boards. Attach this signal only from the device
with FPS = 0 to the backplane or connector,
without buffering
. This signal
requires one 330
, 1% pull-up resistor per stack. This signal can be set for 5V or
3.3V modes by the COMP_SEL pin.
80
MACACTIVE
I
PD
Note:
MAC Active.
Active High input allows external ASICs to participate in 10 Mbps
IRB. Driving data onto the IRB requires the external ASIC assert MACACTIVE
High for one clock cycle, then assert IR10ENA Low. ASIC monitors IR10COL
(active Low) for collision. By using MACACTIVE, the repeater
—
not the MAC
—
drives the three-level IR10CFS pin.
81
HOLDCOL
I/O
PD
Note:
Hold Collision for 10 Mbps mode.
This active High signal is driven by the
device with FPS = 0 to extend a non-local transmit collision to other devices on
the same board. Do not attach the HOLDCOL signals from different boards
together.
Table 3. Inter-Repeater Backplane Signal Descriptions (Continued)
Pin
Symbol
Type
1, 2
Description
1. I = Input, O = Output, I/O = Input/Output, D = Digital, AI = Analog Input, A I/O = Analog Input/Output, OD = Open Drain,
OS = Open Source, PD = Pull Down, PU = Pull Up. Even if the IRB is not used, required pull-up resistors must be installed as
listed above.
NC = No Clamp. Pad does not clamp input in the absence of power.
2. Pins are 5V tolerant, unless indicated.
3. IR100CFS is
not
5V tolerant.
4. IR10CFS is
not
5V tolerant.
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