XM014034B datasheet(9/83 Pages) XMOS

9 / 83 page

XU6--QF6A Datasheet

usb pins ()

Signal

Function

Type

Properties

USB_DM

USB Data-

I/O

USB_DP

USB Data+

I/O

All IO domains are .8V only. Other packages of this product offer programmable voltages

for some of the IO domains.

The GPIO pins have software programmable drive strengths, slew rate control, and schmitt

trigger:

When a port is used for output, the default drive settings for each IO pin are to drive at

mA nominally, with no slew rate control (fast edge). When a port is used as input, the

default settings when you use a port as an input port is to not have a Schmitt-trigger,

and not have a pull resistor. From software, the drive strength can be reduced to mA

in order to reduce EMI, or they can be driven at 8 or

mA in order to increase speed.

The total current that can be supplied by each IO domain is limited and specied in

Section .

When used as an input, IO pins can be programmed to have a Schmitt trigger enabled,

and two programmable pull resistors can be set to either provide a weak pull-down, a

weak pull-up, or a bus keep function where the current level is kept until it is changed by

a strong low or a strong high. Pins that are not in use have a weak pull-down enabled

to keep them in a dened state.

The controls are set on a per-port basis by either using the API functions, or by setting

six bits using the SETC instruction.

XM014034B Datasheet(PDF) 9 Page - Xmos Ltd.