Part # User Manual STBUS UM0484 datasheet

Part Manufacturer: ST Microelectronics

ST Microelectronics

Part Description: STBus communication system concepts and definitions


Part Details:

UM0484 User manual STBus communication system concepts and definitions Abstract This document introduces the concepts and definitions referring to the STBus, the communication system (interconnect) developed for system-on-chip (SoC) applications and whose usage inside and outside ST is becoming wider and wider. The basic terminology, the main concepts and the various available protocols are presented at a detailed but accessible level, to allow the reader to gain familiarity with the STBus and gain the background knowledge required to implement an STBus system. Objectives The objective of this document is to provide all the information required to understand the STBus. It covers the communication protocols and the interfaces. Audience This document addresses its audience as the interconnect architects, the interconnect designers, the application engineers and the project leaders. The document can be used as a complete and concise reference about the STBus communication system by anyone starting architectural or design activities about the STBus. November 2007 Rev 1 1/67 www.st.com Contents STBus Contents 1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.1 STBus overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.1.1 Basic terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.1.2 Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.1.3 Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 1.1.4 Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2 STBus signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.1 Control signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.1.1 Initiator to target . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.1.2 Target to initiator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.2 Transaction signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2.2.1 Initiator to target . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2.2.2 Target to initiator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 2.3 Service signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 2.4 Test signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 3 STBus protocols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 3.1 Type 1 protocol (peripheral) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 3.1.1


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