USB2513 datasheet(30/63 Pages) MICROCHIP

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USB 2.0 Hi-Speed Hub Controller

Datasheet

Revision 2.2 (02-17-12)

SMSC USB251xB/xBi

DATASHEET

5.1.7

BIT

NUMBER

BIT NAME

DESCRIPTION

SELF_BUS_PWR

Self or Bus Power: selects between self- and bus-powered operation.

The hub is either self-powered (draws less than 2 mA of upstream bus

power) or bus-powered (limited to a 100 mA maximum of upstream power

prior to being configured by the host controller).

When configured as a bus-powered device, the SMSC hub consumes less

than 100 mA of current prior to being configured. After configuration, the bus-

powered SMSC hub, along with all associated hub circuitry, any embedded

devices (if part of a compound device), and all externally available

downstream ports (max 100 mA) must consume no more than 500 mA of

upstream VBUS current. The current consumption is system dependent and

must not violate the USB 2.0 Specification [1].

When configured as a self-powered device, < 1 mA of upstream VBUS

current is consumed and all ports are available. Each port is capable of

sourcing 500 mA of current.

This field is set over either the SMBus or I2C EEPROM interface options.

0 : bus-powered operation

1 : self-powered operation

If dynamic power switching is enabled (Section 5.1.8), this bit is ignored and

LOCAL_PWR is used to determine if the hub is operating from self or bus

power.

rsvd

HS_DISABLE

Hi-Speed Disable: disables the capability to attach as either a hi- or full-

speed device, forcing full-speed attachment only (i.e., no hi-speed support).

0 : hi-/full-speed

1 : full-speed only (hi-speed disabled)

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).

0 : single TT for all ports

1 : multi-TT (one TT per port)

EOP_DISABLE

EOP Disable: disables End Of Packet (EOP) generation at End Of Frame

Time #1 (EOF1) when in full-speed mode.

During full-speed operation only, the hub can send EOP when no

downstream traffic is detected at EOF1. See the USB 2.0 Specification,

Section 11.3.1

for details.

0 : EOP generation is normal

1 : EOP generation is disabled

2:1

CURRENT_SNS

Over-Current Sense: selects current sensing on all ports (ganged); a port-

by-port basis (individual); or none (for bus-powered hubs only). The ability to

support current sensing on a ganged or port-by-port basis is hardware

implementation dependent.

00 : ganged sensing

01 : individual sensing

1x : over-current sensing not supported (use with bus-powered

configurations)

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