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LAN9354 Datasheet(PDF) 99 Page - Microchip Technology

Part # LAN9354
Description  3-Port 10/100 Managed Ethernet Switch
Download  487 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

LAN9354 Datasheet(HTML) 99 Page - Microchip Technology

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 2015 Microchip Technology Inc.
DS00001926B-page 99
LAN9354
9.2.16
LOOPBACK OPERATION
The PHYs may be configured for near-end loopback and connector loopback. These loopback modes are detailed in
the following subsections.
9.2.16.1
Near-end Loopback
Near-end loopback mode sends the digital transmit data back out the receive data signals for testing purposes, as indi-
cated by the blue arrows in Figure 9-6. The near-end loopback mode is enabled by setting the Loopback (PHY_LOOP-
BACK) bit of the PHY x Basic Control Register (PHY_BASIC_CONTROL_x) to “1”. A large percentage of the digital
circuitry is operational in near-end loopback mode because data is routed through the PCS and PMA layers into the
PMD sublayer before it is looped back. The COL signal will be inactive in this mode, unless Collision Test Mode
(PHY_COL_TEST) is enabled in the PHY x Basic Control Register (PHY_BASIC_CONTROL_x). The transmitters are
powered down regardless of the state of the internal MII TXEN signal.
12
91
13
102
14
113
15
123
Note:
For a properly terminated cable (Match case), there is no reflected signal. In this case, the TDR Channel
Length field is invalid and should be ignored.
FIGURE 9-6:
NEAR-END LOOPBACK BLOCK DIAGRAM
TABLE 9-9:
MATCH CASE ESTIMATED CABLE LENGTH (CBLN) LOOKUP
10/100
Ethernet
MAC
CAT-5
XFMR
Digital
RXD
TXD
Analog
RX
TX
X
X


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