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DP83256 データシート(PDF) 33 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部品番号 DP83256
部品情報  PLAYERa??Device (FDDI Physical Layer Controller)
PDF  144 Pages
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メーカー  NSC [National Semiconductor (TI)]
ホームページ  http://www.national.com
Logo NSC - National Semiconductor (TI)

DP83256 データシート(HTML) 33 Page - National Semiconductor (TI)

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40 Modes of Operation (Continued)
Long Internal Loopback
The Long Internal Loopback mode implements the longest
loopback path that is completely within the PLAYERa de-
vice
The Long Internal Loopback mode can be used to test the
functionality of the PLAYERa device including the Clock
Recovery function and to test the data paths between the
PLAYERa device and MACSI devices before ring insertion
When in the Long Internal Loopback mode the PLAYERa
device performs the following functions
 Directs the output data of the Transmitter Block to the
input of the Clock Recovery Module through an internal
path
 Ignores the PMD Data Indicate pins (PMIDg)
 Outputs Quiet symbols through the PMD Data Request
pins (PMRDg)
The level of the Quiet symbols transmitted through the
PMRDg pins during loopback is automatically set to the
transmitter off level
If both Short Internal Loopback and Long Internal Loopback
modes are selected Long Internal Loopback mode will
have priority over Short Internal Loopback mode This is the
longest loopback path within the PLAYERa device
Note that the LILB path is disconnected and should not be
used when the Alternate PMD Interface is active
See
Figure 4-4 Long Internal Loopback
TLF11708 – 26
FIGURE 4-4 Long Internal Loopback
33



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