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| 型號(hào)： | 9860 |
| 廠商： | Intel Corp. |
| 英文描述： | Advanced 10/100 Repeater with Intergrated Management |
| 中文描述： | 高級(jí)10/100中繼器與綜合管理 |
| 文件頁(yè)數(shù)： | 24/118頁(yè) |
| 文件大小： | 1648K |
| 代理商： | 9860 |
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LXT9860/9880
—
Advanced 10/100 Repeater with Integrated Management
24
Datasheet
Document #: 248987
Revision#: 003
Rev Date: 08/07/01
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 Chip ID = 00 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
10 Mbps IRB Collision Force Sense - Backplane.
Functions the
same as IR10CFS, but connects between boards. Attach this
signal only from the device with Chip ID = 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
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.
55
IR10ISO
O
10 Mbps IRB Isolate.
By using IR10 ISO, one LXT98x0 per
board can enable or disable an external bidirectional transceiver
(74LVT245). Attach the output to the Enable input of the
74LVT245. Driven High (disable) to isolate the 10 Mbps IRB.
81
HOLDCOL
I/O
PD
Hold Collision for 10 Mbps mode.
This active High signal is
driven by the device with Chip ID = 00 to extend a non-local
transmit collision to other devices on the same board. Do not
attach the HOLDCOL signals from different boards together.
201
MMSTRIN
I
PD
Management Master Input.
The Management Master (MM)
daisy chain ensures collisions are counted correctly in multi-board
applications. Attach the MMSTRIN input of each device to the
MMSTROUT output of the previous device. Ground MMSTRIN of
the first or only device.
64
MMSTROUT
O
Management Master Output.
MM daisy chain output. In hot-
swap applications, a 1 k
- 3 k
resistor can be used as a by-
pass between MMSTRIN and MMSTROUT.
Table 5. 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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