LAN9250 datasheet(255/421 Pages) MICROCHIP

255 / 421 page

 2015 Microchip Technology Inc.

DS00001913A-page 255

LAN9250

12.2.18.18 PHY Special Control/Status Indication Register (PHY_SPECIAL_CONTROL_STAT_IND)

This read/write register is used to control various options of the PHY.

Index (decimal): 27

Size:

16 bits

Bits

Description

Type

Default

Auto-MDIX Control (AMDIXCTRL)

This bit is responsible for determining the source of Auto-MDIX control for the

port. When set, the Manual MDIX and Auto MDIX straps (manual_mdix-

_strap_1/auto_mdix_strap_1) are overridden, and Auto-MDIX functions are

controlled using the AMDIXEN and AMDIXSTATE bits of this register. When

cleared, Auto-MDIX functionality is controlled by the Manual MDIX and Auto

MDIX straps by default. Refer to Section 7.0, "Configuration Straps," on

page 54 for configuration strap definitions.

0: Port Auto-MDIX determined by strap inputs (Table 12-14)

1: Port Auto-MDIX determined by bits 14 and 13

Note:

The value of auto_mdix_strap_1 is indicated in the AMDIX_EN

Strap State bit of the Hardware Configuration Register (HW_CFG).

R/W

NASR

Note 19

Auto-MDIX Enable (AMDIXEN)

When the AMDIXCTRL bit of this register is set, this bit is used in conjunction

with the AMDIXSTATE bit to control the Port Auto-MDIX functionality as

shown in Table 12-13.

Auto-MDIX is not appropriate and should not be enabled for 100BASE-FX

mode.

R/W

NASR

Note 19

Auto-MDIX State (AMDIXSTATE)

When the AMDIXCTRL bit of this register is set, this bit is used in conjunction

with the AMDIXEN bit to control the Port Auto-MDIX functionality as shown in

Table 12-13.

R/W

NASR

Note 19

RESERVED

SQE Test Disable (SQEOFF)

This bit controls the disabling of the SQE test (Heartbeat). SQE test is

enabled by default.

0: SQE test enabled

1: SQE test disabled

R/W

NASR

Note 19

10:6

RESERVED

Far End Fault Indication Enable (FEFI_EN)

This bit enables Far End Fault Generation and Detection. See Section

12.2.16.1, "100BASE-FX Far End Fault Indication," on page 229 for more

information.

R/W

Note 20

10Base-T Polarity State (XPOL)

This bit shows the polarity state of the 10Base-T.

0: Normal Polarity

1: Reversed Polarity

LAN9250 Datasheet(PDF) 255 Page - Microchip Technology

LAN9250 Datasheet(HTML) 255 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL