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DP83255AVF bảng dữ liệu(PDF) 17 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
tên linh kiện DP83255AVF
Giải thích chi tiết về linh kiện  PLAYER Device (FDDI Physical Layer Controller)
PDF  96 Pages
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nhà sản xuất  NSC [National Semiconductor (TI)]
Trang chủ  http://www.national.com
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DP83255AVF bảng dữ liệu(HTML) 17 Page - National Semiconductor (TI)

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40 Modes of Operation (Continued)
433 External Loopback
The External Loopback mode can be used to test the func-
tionality of the PLAYER device and to test the data paths
between the PLAYER CRD and BMAC devices before
transmitting and receiving data through the network
When in the External Loopback mode the PLAYER device
performs the following functions
 Directs the output data of the Transmitter Block to the
external Loopback Data pins (LBDg) which are normal-
ly connected to the Clock Recovery Device (see
Figure
2 PLAYER Device Block Diagram)
 Outputs Quiet symbols through the PMD Data Request
pins (TXDg)
The level of the Quiet symbols transmitted through the
TXCg pins is programmable through the Transmit Quiet
Level bit of the Mode Register
If both Internal Loopback and External Loopback modes are
selected Internal Loopback mode will have priority over Ex-
ternal Loopback mode
See
Figure 4-3 for a block diagram
TLF10386 – 17
FIGURE 4-3 External Loopback
17



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