HBLXT9785HC.C2 Cortina Systems Inc, HBLXT9785HC.C2 Datasheet - Page 154

• Manufacturer Part Number: HBLXT9785HC.C2
• Manufacturer: Cortina Systems Inc

Specifications of HBLXT9785HC.C2

• Lead Free Status / Rohs Status: Supplier Unconfirmed

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.
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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
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