LAN9514 datasheet(31/54 Pages) MICROCHIP

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 2009-2016 Microchip Technology Inc.

DS00002306A-page 31

LAN9514/LAN9514I

TABLE 3-9:

BOOST_4:2 REGISTER (BOOST42) FORMAT

Bits

Description

Default

7:6

Upstream USB Electrical Signaling Drive Strength Boost Bit for Downstream

Port 4 (BOOST_IOUT_4)

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)

00b

5:4

Upstream USB Electrical Signaling Drive Strength Boost Bit for Downstream

Port 3 (BOOST_IOUT_3)

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)

00b

3:2

Upstream USB Electrical Signaling Drive Strength Boost Bit for Downstream

Port 2 (BOOST_IOUT_2)

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)

00b

1:0

RESERVED

00b

TABLE 3-10:

STATUS/COMMAND REGISTER (STCD) FORMAT

Bits

Description

Default

7:2

RESERVED

000000b

Reset (RESET)

Resets the internal memory back to nRESET assertion default settings.

0 = Normal Run/Idle State

1 = Force a reset of the registers to their default state

Note:

During this reset, this bit is automatically cleared to its default value of 0.

USB Attach and Write Protect (USB_ATTACH)

0 = Device is in configuration state

1 = Hub will signal a USB attach event to an upstream device, and the internal

memory (address range 00h - FEh) is “write-protected” to prevent unintentional data

corruption.

Note:

This bit is write once and is only cleared by assertion of the external

nRESET or POR.

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