AS39513 datasheet(44/108 Pages) AMSCO

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[v1-10] 2018-Apr-25

AS39513 − Detailed Description

Memory Access Levels

Every address in the memory map is assigned to one of four

types of access levels: Application, Measurement, System, and

Factory. The properties of each access level are described in this

section and shown in Figure 32.

Figure 32:

Memory Map

Application Access Region

The Application access region is for application parameters that

are protected from data logging. This region begins at byte

address 0x000 and ends at byte address 4*APPBLKS[7:0] + 3.

This region is readable by both the RFID and SPI memory access

commands. It is writeable through RFID only if Application

access has been granted through the Set Access command. It

is always writeable through the SPI.

Memory Area

Location

Contents

RFID Access

SPI Access

Application

0x000

-4*APPBLKS[7:0]+3

Application data

not logged data

Readable by RFID.

Writeable by RFID

if Application

access has been

granted through

Set Access

Read/Write by SPI

Measurement

4*APPBLKS[7:0]+4

to 0x3FF

Logged data

Readable by RFID.

Writeable by RFID if

Measurement

access has been

granted through

Set Access

Read/Write by SPI

System

See Memory Map

Layout

System-level

parameters (e.g.

logging start time,

logging interval &

limits), data

pointers, and

other control

settings.

Readable by RFID.

Writeable by RFID if

System access has

been granted

through Set Access

Read/Write by SPI

Factory

See Memory Map

Layout

Calibration info,

passwords,

memory lock bits

etc.

Examples are UID,

real time and

system oscillator

trim values

Lock bits can be set

but not read

through the RF

interface using the

Lock Block

command but

otherwise not

accessible through

the RF interface.

Readable through

SPI Writeable

through SPI if

Factory access is

active.

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