FWLXT9785EBC.D0 Cortina Systems Inc, FWLXT9785EBC.D0 Datasheet - Page 154
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FWLXT9785EBC.D0
Manufacturer Part Number
FWLXT9785EBC.D0
Description
Manufacturer
Cortina Systems Inc
Datasheet
1.FWLXT9785EBC.D0.pdf
(221 pages)
Specifications of FWLXT9785EBC.D0
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LXT9785/LXT9785E
Datasheet
249241, Revision 11.0
16 April 2007
Figure 31
4.12.3
Note:
Cortina Systems
When a long event (such as duplex status) occurs, it is edge detected and starts the
stretch timer. When the stretch timer expires, the edge detector is reset so that a long
event causes another pulse to be generated from the edge detector. The edge detector
resets the stretch timer, causing the LED driver to remain asserted.
page 154
LED Pulse Stretching
Out-of-Band Signaling
The LXT9785/LXT9785E provides an out-of-band signaling option to transfer status
information across the RMII receive interface. This feature is enabled when Register bit
25.0 = 1 and uses the RxData(1:0) data bus during the Inter-Packet Gap (IPG) time as
shown in
setting Register 0.10.
The BGA15 package does not support Out-of-Band Signaling nor the RMII interface.
The two status bits transferred across the RxData bus are software selectable via
Register 25 (see
page
In normal operation, the LXT9785/LXT9785E stuffs the RxData bus with zeros during the
IPG. A software-selectable bit enables the RMII out-of-band signaling feature. Once this
bit is set, the LXT9785/LXT9785E replaces the zeros with selected status bits during the
IPG.
®
LXT9785 and LXT9785E Advanced 8-Port 10/100 Mbps PHY Transceivers
Event
LED
Note: The direct drive LED outputs in this diagram are shown as active L ow.
206).
Figure
shows how the stretch operation functions.
stretch
32. Out-of-Band signaling is disabled when Isolate mode is enabled by
Table 99, RMII Out-of-Band Signaling Register (Address 25, Hex 19), on
stretch
stretch
4.12 Monitoring Operations
Figure 31 on
Page 154
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