STR720 datasheet(126/401 Pages) STMICROELECTRONICS

Part #	STR720

Description	ARM720T 16/32-BIT MCU WITH 16K RAM, USB, CAN, 3 TIMERS, ADC, 6 COMMUNICATIONS INTERFACES

PDF	401 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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126 / 401 page

STR720 - ATAPI-IDE INTERFACE

126/401

12 ATAPI-IDE INTERFACE

12.1 Introduction

The ATAPI-IDE controller allows the STR720 to interface to up to 2 devices such as Hard Disk

or CD-ROM drives. Communication over the IDE bus is performed in PIO mode only. IDE

communication in DMA or UDMA modes is not supported. The STR720 initiates

communication with the IDE device by writing IDE commands directly in the IDE registers. To

save CPU time, the STR720 DMA controller may be used in “memory-to-memory” transfer

mode to access the IDE registers.

12.2 Main Features

The ATAPI-IDE controller supports the following features:

•

Primary-only channel, supporting up to two IDE devices

•

Support for CD-ROM and tape peripherals

•

Independently programmable timing for each device

•

Programmable posted writes and read-prefetch

•

Software selectable endianness for data read from CDROM / tape peripheral

•

Support for I/O Channel Ready

•

Support for PIO modes 0, 2, 3 and 4

•

Variable IDE:AHB clock ratio

STR720 Datasheet(PDF) 126 Page - STMicroelectronics