USB2524 datasheet(20/58 Pages) MICROCHIP

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USB2524

DS00001588B-page 20

 2013 - 2016 Microchip Technology Inc.

7.1.4.8

MTT_ENABLE

Multi-TT enable: Enables one transaction translator per port operation.

Selects between a mode where only one transaction translator is available for

all ports (Single-TT), or each port gets a dedicated transaction translator

(Multi-TT) {Note: The host may force Single-TT mode only}. When using the

internal default option, the MTT_EN pin enables/disables MTT support.

0 = single TT for all ports.

1 = one TT per port (multiple TT’s supported)

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).

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 hardware implementation dependent.

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 hardware implementation dependent.

0 = Ganged switching (all ports together)

1 = Individual port-by-port switching.

Bit Number

Bit Name

Description

DYNAMIC

Dynamic Power Enable: Controls the ability of the Hub to automatically

change from Self-Powered operation to Bus- Powered operation if the local

power source is removed or is unavailable (and from Bus-Powered to Self-

Powered if the local power source is restored). {Note: If the local power

source is available, the Hub will always switch to Self-Powered operation.}

When Dynamic Power switching is enabled, the Hub detects the availability

of a local power source by monitoring the external SELF_PWR pin. If the Hub

detects a change in power source availability, the Hub immediately

disconnects and removes power from all downstream devices and

disconnects the upstream port. The Hub will then re-attach to the upstream

port as either a Bus-Powered Hub (if local-power in unavailable) or a Self-

Powered Hub (if local power is available).

0 = No Dynamic auto-switching.

1 = Dynamic Auto-switching capable.

Reserved

Reserved, always = ‘0’.

5:4

OC_TIMER

OverCurrent Timer: Over Current Timer delay.

00 = 0.1ms

01 = 2ms

10 = 4ms

11 = 6ms

Bit Number

Bit Name

Description

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