HBLXT9785HE.D0 Intel, HBLXT9785HE.D0 Datasheet - Page 117
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HBLXT9785HE.D0
Manufacturer Part Number
HBLXT9785HE.D0
Description
Manufacturer
Intel
Datasheet
1.HBLXT9785HE.D0.pdf
(221 pages)
Specifications of HBLXT9785HE.D0
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Part Number:
HBLXT9785HE.D0
Manufacturer:
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LXT9785/LXT9785E
Datasheet
249241, Revision 11.0
16 April 2007
4.3.1
Table 41
4.3.2
Figure 8
Cortina Systems
Global MII Mode Select
The mode select pins are used for MII interface configuration settings upon power-up
sequencing. All ports are configured the same and cannot be intermixed.
MII Mode Select
Internal Loopback
Register bit 0.14 must be set to enable internal loopback operation. Register bits 16.14
and 0.8 must be set for 10 Mbps operation. Cortina recommends that auto-negotiation be
disabled while internal loopback is enabled. The normal auto-negotiation process code
word exchange cannot be completed.The following two-step sequence is recommended
for the most efficient mode change when enabling forced 100 Mbps internal loopback
mode directly from auto-negotiation mode:
This two-step process ensures the 100 Mbps link comes up quickly. If the one-write
process of writing 0x6100h is followed, it may take up to 1.5 seconds before link is
established and data is received on the port. The 1.5 second delay is due to the IEEE
auto-negotiation Break Link Timer (BLT) requirement. The timer must expire before link is
established when changing modes directly from auto-negotiation to internal loopback
forced 100 Mbps mode. Use the above two-step process to eliminate the auto-negotiation
BLT timer requirement.
Internal Loopback
®
1. Invalid for the BGA15 package.
1. Write Register 0 with 0x2100h (forced 100 Mbps), and
2. Write Register 0 with 0x6100h (enable internal loopback with forced 100 Mbps)
LXT9785 and LXT9785E Advanced 8-Port 10/100 Mbps PHY Transceivers
Configuration
Reserved
SS-SMII
RMII
SMII
1
RMII/
SMII/
ModeSel1
inter
SMII
face
SS-
0
0
1
1
Digital
Block
LXT9785/9785E
Loopback
ModeSel0
0
1
0
1
Analog
Block
Driver
Driver
Tx
Fx
Interface (MII) Interfaces
4.3 Media Independent
Page 117
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