LAN7500 datasheet(21/58 Pages) MICROCHIP

21 / 58 page

Hi-Speed USB 2.0 to 10/100/1000 Ethernet Controller

Datasheet

 2014 Microchip Technology Inc.

DS00001734A-page 21

Table 3.2 describes the Configuration Flags 0 byte. If a configuration descriptor exists in the EEPROM,

it will override the values in Configuration Flags 0.

Table 3.2 Configuration Flags 0

BITS

DESCRIPTION

Port Swap

This bit facilitates swapping the mapping of USBDP and USBDM.

0 = USBDP maps to the USB D+ line and USBDM maps to the USB D- line.

1 = USBDP maps to the USB D- line. USBDM maps to the USB D+ line.

6:5

PHY Boost

This field provides the ability to boost the electrical drive strength of the HS output current to the

upstream port.

00 = Normal electrical drive strength.

01 = Elevated electrical drive strength (+4% boost).

10 = Elevated electrical drive strength (+8% boost).

11 = Elevated electrical drive strength (+12% boost).

Duplex Detection

This bit determines whether duplex operational mode is detected automatically or manually set.

0 = Manual

1 = Automatic

Speed Detection

This bit determines whether operational speed is detected automatically or manually set.

0 = Manual

1 = Automatic

SPD_LED_FUNCTION

This bit specifies the functionality of speed LEDs (LED0 and LED1). The Speed LEDs’ behavior is

determined by line speed and the setting of this bit, as indicated in following table:

When SPD_LED_FUNCTION = 0, the LEDs function solely as Link and Speed LEDs. When

SPD_LED_FUNCTION = 1, the LEDs function as Link and Speed and Activity LEDs. In those cases,

the table entry “Blink” indicates the LED will remain on when no transmit or receive activity is detected

and will blink at an 80 mS rate whenever TX or RX activity is detected.

Note:

GPIOEN[1:0] in Configuration Flags 1 must be set in order to properly control speed LED

operation. If only one of the bits is set, then untoward operation and unexpected results may

occur. If both bits are clear, then SPD_LED_FUNCTION is ignored.

SPD_LED_FUNCTION

SPEED (Mbps)

LED0

LED1

No Link

Off

100

Off

1000

No Link

Off

Blink

Off

100

Off

Blink

1000

Blink

LAN7500 Datasheet(PDF) 21 Page - Microchip Technology

LAN7500 Datasheet(HTML) 21 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

Datasheet Download

Link URL