Manual Mdi/Mdix Setting; Link Speed Downshift - Renesas R-IN32M4-CL2 User Manual

Gigabit ethernet phy edition

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R-IN32M4-CL2 User's Manual Gigabit Ethernet PHY Edition

2.1.4

Manual MDI/MDIX Setting

As an alternative to HP Auto-MDIX detection, the PHY can be forced to be MDI or MDI-X using register 19E1, bits 3:2.

Setting these bits to 10 forces MDI and setting 11 forces MDI-X. Leaving the bits 00 enables the HP Auto-MDIX setting

to be based on register 18, bits 7 and 5.

2.1.5

For operation in cabling environments that are incompatible with 1000BASE-T, the GbE-PHY provides an automatic

link speed downshift option. When enabled, the device automatically changes its 1000BASE-T autonegotiation

advertisement to the next slower speed after a set number of failed attempts at 1000BASE-T. No reset is required to get

out of this state when a subsequent link partner with 1000BASE-T support is connected. This feature is useful in setting

up in networks using older cable installations that include only pairs A and B, and not pairs C and D.

To configure and monitor link speed downshifting, set register 20E1, bits 4:2. For more information, see Table 3.33

ActiPHY Control, Address 20E1 (0x14).

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Mar 4, 2016

2. Functional Descriptions

Page 4 of 39

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