Chapter 2. Operational Modes; Introduction; Figure 2-1. Operation Mode Block Diagrams - Cirrus Logic CS485 Series User Manual

Introduction

CS485xxr Hardware User's Manual
2.1 Introduction
The CS485xx has several operational modes that can be used to conform to many system configurations.
The operational modes for the CS485xx specify both the communication mode and boot mode. This chapter
discusses the selection of operational modes, booting procedures and process of performing a soft reset.
The CS485xx can be either a slave device or a master device for the boot procedure. In Master Boot Mode,
the CS485xx is the master boot device and can automatically boot the application code from external serial
ROM (the slave boot device). In Slave Boot Mode, the CS485xx is the slave boot device and requires the
system host controller (the master boot device) to load the application code. Please see
Thus, there are two boot modes for the CS485xx:
• Master Boot (From serial SPI or I
• Slave Boot (Using SPI or I
When the CS485xx is configured for an operational mode where it is the slave boot device, one of the below
communication modes must be specified by the host controller (i.e. the master boot device). These
communication modes are described in detail in
block diagrams and flowcharts depicting each of the Slave and Master boot modes.
2-1
2
C FLASH/EEPROM)
2
C)
Chapter 3, "Serial Control
Control Bus
System Host
Controller
(Master)
Slave Boot
External
Memory Bus
CS4953xx
(Master)
Master Boot

Figure 2-1. Operation Mode Block Diagrams

Copyright 2009 Cirrus Logic, Inc.
Operational Modes
Port". Please see this section for
CS4953xx
(Slave)
External ROM
(Slave)
Chapter 2
Figure 2-1 .
DS734UM7