Usbfs Features; Functional Description; Data Structures - NXP Semiconductors MKL27Z128VFM4 Reference Manual

Table of Contents

For additional information, see the USB 2.0 specification.

Figure 33-5. Example USB 2.0 system configuration

33.2.3 USBFS Features

• USB 1.1 and 2.0 compatible FS device controller

• 16 bidirectional endpoints

• DMA or FIFO data stream interfaces

• Low-power consumption

• with clock-recovery is supported to eliminate the 48 MHz crystal. It is used for USB

device-only implementation.

33.3 Functional description

USBFS communicates with the processor core through status registers, control registers,

and data structures in memory.

To efficiently manage USB endpoint communications, USBFS implements a Buffer

Descriptor Table (BDT) in system memory. See

KL27 Sub-Family Reference Manual , Rev. 5, 01/2016

External Hub

USB Peripherals

Freescale Semiconductor, Inc.