User`s manual

Master Boot Procedure

CS485xxr Hardware User’s Manual

Table 2-5 is a quick reference showing the different boot commands understood by the CS485xx, in

mnemonic and actual hex value, used in

CS485xx boot sequences.

2.4 Master Boot Procedure

A master boot sequence is initiated immediately after the rising edge of RESET. The location of the overlay

to boot is outlined in Table 2-1. Once the rising edge of RESET

has occurred, the CS485xx will load a single

overlay from address 0x0. It should be noted that the loaded overlay must reconfigure one of the control

ports to be slave to the bus for a system host controller to configure the part. Thus, this type of boot process

will be useful in systems without a system host controller or with a simple controller that only performs a

monitoring task. Currently this mode is not used for any applications.

Figure 2-3. Master Boot Sequence Flowchart

Table 2-5. Boot Command Messages for CS485xx

MNEMONIC VALUE DETAILED TABLE

SLAVE_BOOT 0x80000000 Table 2-2

SOFT_RESET 0x40000000 Table 2-3

Start

RESET ( Low)

RESET ( High)

Done

Set HS[4:0] Pins For

Operational Mode