Output (MDIO) Module User's Guide

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4.12 MDIO User PHY Select Register 0 (USERPHYSEL0)

MDIO Registers

The MDIO user PHY select register 0 (USERPHYSEL0) is shown in Figure 38 and described in

Table 36 .

Figure 38. MDIO User PHY Select Register 0 (USERPHYSEL0)

31 16

Reserved

R-0

15 8 7 6 5 4 0

Reserved LINKSEL LINKINTENB Rsvd PHYADRMON

R-0 R/W-0 R/W-0 R-0 R/W-0

LEGEND: R/W = Read/Write; R = Read only; - n = value after reset

Table 36. MDIO User PHY Select Register 0 (USERPHYSEL0) Field Descriptions

Bit Field Value Description

31-8 Reserved 0 Reserved

7 LINKSEL Link status determination select bit. Default value is 0, which implies that the link status is

determined by the MDIO state machine. This is the only option supported on this device.

0 The link status is determined by the MDIO state machine.

1 Not supported.

6 LINKINTENB Link change interrupt enable. Set to 1 to enable link change status interrupts for PHY address

specified in PHYADRMON. Link change interrupts are disabled if this bit is set to 0.

0 Link change interrupts are disabled.

1 Link change status interrupts for PHY address specified in PHYADDRMON bits are enabled.

5 Reserved 0 Reserved

4-0 PHYADRMON 0-1Fh PHY address whose link status is to be monitored.

SPRUEQ6 – December 2007 Ethernet Media Access Controller (EMAC)/Management Data Input/Output (MDIO) 81

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