USB84604 datasheet(30/61 Pages) MICROCHIP

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USB84604

DS60001295C-page 30

 2014-2016 Microchip Technology Inc.

6.3.2

SPI SPEED SELECT (SPI_SPD_SEL)

This strap is used to select the speed of the SPI as follows:

6.4

SPI External Flash

All SPI EEPROM programming is performed via the upstream USB connection of the hub. The hub must be powered

on and enumerated (connected) to the USB host PC.

Two types of files may be programmed to the SPI EEPROM:

• Complete firmware file obtained from Microchip.

• User generated configuration file created with ProTouch2.

The external flash can be programmed using the Microchip ProTouch2 MPT software tool which can be downloaded

from the Microchip website at http://www.microchip.com/ProTouch.

6.4.1

COMPATIBLE DEVICES

The SPI EEPROM must conform to the following requirements in order to be compatible with Microchip hubs:

• 60 MHz clock rate

• Dual data read capable

• 2 MB or larger capacity (recommended)

6.4.2

OBTAINING FIRMWARE IMAGES

Firmware images alter the base functionality of the UCH Hub. Firmware images must be provided by Microchip, they

are not user-generated. To obtain the latest firmware releases, consult the product pages (Documentation and Software

section) of the devices above.

6.4.3

OBTAINING CONFIGURATION FILES

Configuration files are user-generated files that change basic operational parameters of the hub such as changing ven-

dor Ids, disabling downstream ports, or adjusting the PHYBoost or VariSense settings. Configuration files can be gen-

erated using the original ProTouch graphical user interface.

TABLE 6-2:

SPI_SPD_SEL CONFIGURATION DEFINITIONS

SPI_SPD_SEL

Definition

‘0’

30 MHz SPI operation (default)

‘1’

60 MHz SPI operation

Note:

If the latched value on reset is 1, this pin is tri-stated when the chip is in the suspend state. If the latched

value on reset is 0, this pin is driven low during a suspend state.

Note:

Refer to the Protouch MPT user manual on using this software to program the configuration. It can be

downloaded from the same website.

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