USB3803 datasheet(36/99 Pages) MICROCHIP

36 / 99 page

USB3803

DS00001691B-page 36

 2014-2015 Microchip Technology Inc.

5.3.37

5.3.38

Default = 0x00h

Bit Number

Bit Name

Description

ClkSusp

(Read/Write)

1 = Force device to run internal clock even during USB suspend (will cause

device to violate USB suspend current limit - intended for test or self-powered

applications which require use of serial port during USB session.)

0 = Allow device to gate off its internal clocks during suspend mode in order to

meet USB suspend current requirements.

IntSusp

(Read/Write)

1 = INT_N pin function is a level sensitive USB suspend interrupt indication.

Allows system to adjust current consumption to comply with USB specification

limits when hub is in the USB suspend state.

0 = INT_N pin function retains event sensitive role of a general serial port inter-

rupt.

See Section 3.3.4, "Interrupt," on page 14 for more information.

5:4

CfgTout

(Read Only)

Specifies timeout value for allowing SOC to configure the device. Corresponds

to the Thubconfig parameter. See Table 4-2, “Timing Parameters for Hub Stages,”

on page 19.

Reserved

2:0

Reserved

Bit Number

Bit Name

Description

Reserved

6:4

UP_SQUELCH These two bits control the Squelch setting of the upstream PHY.

‘000’ = Nominal value

‘001’ = 90% of Nominal value

‘010’ = 80% of Nominal value

‘011’ = 70% of Nominal value

‘100’ = 60% of Nominal value

‘101’ = 50% of Nominal value

‘110’ = 120% of Nominal value

‘111’ = 110% of Nominal value

Reserved

2:0

DN3_SQUELC

These two bits control the Squelch setting of the downstream port 3.

‘000’ = Nominal value

‘001’ = 90% of Nominal value

‘010’ = 80% of Nominal value

‘011’ = 70% of Nominal value

‘100’ = 60% of Nominal value

‘101’ = 50% of Nominal value

‘110’ = 120% of Nominal value

‘111’ = 110% of Nominal value

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