USB2640 datasheet(34/60 Pages) MICROCHIP

34 / 60 page

USB2640/USB2641

DS00001947C-page 34

 2015-2021 Microchip Technology Inc.

7.3.5.8

E5h: Configuration Data Byte 2 (CFG_DAT_BYT2)

HS_DISABLE

Hi-Speed Disable: Disables the capability to attach as either a Hi-/Full-Speed

device, and forces attachment as Full-Speed only (i.e. no Hi-Speed support).

‘0’ = Hi-/Full-Speed

‘1’ = Full-Speed-Only (Hi-Speed disabled!)

Reserved

Always reads ‘0’.

EOP_DISABLE

EOP Disable: Disables EOP generation of EOF1 when in Full-Speed mode.

During FS operation only, this permits the hub to send EOP if no downstream

traffic is detected at EOF1. See Section 11.3.1 of the USB 2.0 Specification

for additional details. Note: generation of an EOP at the EOF1 point may

prevent a Host Controller (operating in FS mode) from placing the USB bus

in suspend.

‘0’ = An EOP is generated at the EOF1 point if no traffic is detected.

‘1’ = EOP generation at EOF1 is disabled (Note: This is normal USB

operation).

Note:

This is a rarely used feature in the PC environment, existing drivers

may not have been thoroughly debugged with this feature enabled.

It is included because it is a permitted feature in Chapter 11 of the

USB 2.0 Specification.

2:1

CURRENT_SNS

Over-Current Sense: Selects current sensing on a port-by-port basis, all ports

ganged, or none (only for bus-powered hubs). The ability to support current

sensing on a port or ganged basis is dependent upon the hardware

implementation.

‘00’ = Ganged sensing (all ports together)

‘01’ = Individual port-by-port

‘1x’ = Over-current sensing not supported (must only be used with bus-

powered configurations!)

PORT_PWR

Port Power Switching: Enables power switching on all ports simultaneously

(ganged), or port power is individually switched on and off on a port- by-port

basis (individual). The ability to support power enabling on a port or ganged

basis is dependent upon the hardware implementation.

‘0’ = Ganged switching (all ports together)

‘1’ = Individual port-by-port switching

Bit

Name

Description

7:6

Reserved

Always reads ‘0’.

5:4

OC_TIMER

OverCurrent Timer: Over-current Timer delay.

00 = 50 ns

01 = 100 ns

10 = 200 ns

11 = 400 ns

COMPOUND

Compound Device: Allows OEM to indicate that the hub is part of a compound

(see the USB 2.0 Specification for definition) device. The applicable port(s)

must also be defined as having a "non-removable device".

When configured via strapping options, declaring a port as non-removable

automatically causes the hub controller to report that it is part of a Compound

Device.

‘0’ = No

‘1’ = Yes, the hub is part of a Compound Device

2:0

Always reads ‘0’.

Bit

Name

Description

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