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DP83255AVF 데이터시트(PDF) 16 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
부품명 DP83255AVF
상세설명  PLAYER Device (FDDI Physical Layer Controller)
PDF  96 Pages
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제조업체  NSC [National Semiconductor (TI)]
홈페이지  http://www.national.com
Logo NSC - National Semiconductor (TI)

DP83255AVF 데이터시트(HTML) 16 Page - National Semiconductor (TI)

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40 Modes of Operation (Continued)
432 Internal Loopback
The Internal Loopback mode can be used to test the func-
tionality of the PLAYER device and to test the data paths
between the PLAYER and BMAC devices before ring inser-
tion
When in the Internal Loopback mode the PLAYER device
performs the following functions
 Directs the output data of the Transmitter Block to the
input of the Receiver Block through internal paths (see
Figure 2-1 PLAYER Device Block Diagram)
 Ignores the PMD Data Indicate pins (RXDg and RXCg)
 Outputs Quiet symbols through the PMD Data Request
pins (TXDg) and
 Outputs Quiet symbols through the External Loopback
Data pins (LBDg)
The level of the Quiet symbols transmitted through the
TXCg pins is programmable through the Transmit Quiet
Level bit of the Mode Register
The level of the Quiet symbols transmitted through the
LBDg pins is always high regardless of 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 4-2 for a block diagram
TLF10386 – 16
FIGURE 4-2 Internal Loopback
16



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