參數(shù)資料
型號： 9880
廠商： Intel Corp.
英文描述： Advanced 10/100 Repeater with Intergrated Management
中文描述： 高級10/100中繼器與綜合管理
文件頁數(shù)： 51/118頁
文件大小： 1648K
代理商： 9880
Advanced 10/100 Repeater with Integrated Management
—
LXT9860/9880
Datasheet
Document #: 248987
Revision#: 003
Rev Date: 08/07/01
51
3.9
MII Port Operation
The LXT98x0 MII ports allow direct connection with a MAC. The MII ports can operate at either
10 Mbps or 100 Mbps. Speed control is provided via MII
n_
SPD. For 100 Mbps operation, set
MII
n
_SPD = 1. For 10 Mbps operation, set MII
n_
SPD = 0.
The LXT98x0 maintains the same statistics for the MIIs as it does for the 10/100 ports (except for
isolate, partition, and illegal symbols). The LXT98x0 does
not
provide MDIO/MDC capability, as
this is provided via the Serial Management Interface (SMI).
3.9.1
Preamble Handling
When operating at 100 Mbps, the LXT98x0 passes the full 56 bits of preamble through before
sending the SFD. When operating at 10 Mbps, the LXT98x0 sends data across the MII starting
with the 8-bit SFD (no preamble bits).
Note:
MII Ports do not count partition, isolation, or symbol errors.
Table 20. IRB Signal Details
Name
Pad Type
Buffer
Pull-up
Connection Type
100 Mbps IRB Signals
IR100DAT<4:0>
Digital
Yes
No
Full
IR100CLK
Digital
Yes
1K
Full
IR100DV
Digital, Open Drain
Yes
300
Full
IR100CFS
Analog
No
215
, 1%
Local
IR100CFSBP
Analog
No
91
, 1%
Stack
IR100COL
Digital
No
No
Local
IR100SNGL
Digital
No
No
Local
IR100DEN
Digital, Open Drain
N/A
1
330
Local
IR100ISO
Digital
N/A
1
No
Special
10 Mbps IRB Signals
IR10DAT
Digital, Open Drain
Yes
330
Full
IR10CLK
Digital
Yes
No
Full
IR10ENA
Digital, Open Drain
Yes
330
Full
IR10CFS
Analog
No
215
, 1%
Local
IR10CFSBP
Analog
No
330
, 1%
Stack
IR10COL
Digital
No
330
, 1%
Local
IR10COLBP
Digital
No
330
, 1%
Stack
IR10DEN
Digital, Open Drain
N/A
1
330
Local
IR10ISO
Digital
N/A
1
No
Special
1. Isolate and Driver Enable signals are provided to control an external bidirectional transceiver.
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