mcf5272 Freescale Semiconductor, Inc, mcf5272 Datasheet - Page 263

• Manufacturer Part Number: mcf5272
• Description: Mcf5272 Coldfire Integrated Microprocessor User
• Manufacturer: Freescale Semiconductor, Inc

MOTOROLA
12.2 Module Operation
The MCF5272 USB system consists of a protocol state machine which controls the
transmitter and receiver modules. The state machine implements only the USB function
state diagram. The MCF5272 USB controller can serve as a USB function endpoint, but
cannot serve as a USB host.
12.2.1 USB Module Architecture
A block diagram of the USB module is shown in Figure 12-2. The module is partitioned
into five functional blocks. These blocks are USB internal transceiver, clock generator,
USB control logic, USB request processor, and endpoint controllers.
USB_D-
USB_D+
USB_TxEN
USB_ExtCLK
USB_Susp
USB_RxD
To USB
USB_VDD
USB_GND
USB_RN
• Detects start-of-frame and missed start-of-frame for isochronous endpoint
• Notification of start-of-frame, reset, suspend, and resume events
Cable
USB_TN
USB_RP
USB_TP
synchronization
External Transceiver
Transceiver
Internal
Interface
Figure 12-2. USB Module Block Diagram
Chapter 12. Universal Serial Bus (USB)
System Clock
Generator
Clock
OUT FIFO
512-Byte
USB Control
Controllers
Endpoint
Logic
Internal Bus
512-Byte
IN FIFO
Module Operation
USB Request
Configuration
1024-Byte
Processor
RAM
12-3