AS39513 datasheet(45/108 Pages) AMSCO

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ams Datasheet

Page 45

[v1-10] 2018-Apr-25

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AS39513 − Detailed Description

Measurement Access Region

The Measurement access region is for data logging. If

APPBLKS[7:0] is not 8’d255, this region begins at address

4*APPBLKS[7:0] + 4 and ends at address 0x3FF. (If APPBLKS[7:0]

equals 8’d255, there is no Measurement region.) This region is

readable by both the RFID and SPI memory access commands.

It is writeable through RFID only if Measurement access has

been granted through the Set Access command. It is always

writeable through the SPI. The logging functions do not need

Measurement access in order to write to this region; the

Measurement access is only required for direct writing via the

RFID interface.

System Access Region

The System access region is for system-level calibration

parameters, data pointers, and other control settings. This

region is readable by both the RFID and SPI memory access

commands. It is writeable through the RFID interface only if

System access has been granted through the Set Access

command. It is always writeable through the SPI.

There are two sub-regions of System access. The EEPROM region

is from address 0x400 through 0x43F. All values in this region

are readable and writable with the correct access.

The second sub-region of System access is the mirrored

registers. It is for EEPROM parameters that are read and copied

into registers at startup. This region is from address 0x600

through 0x63F. All values in this region are write-only (with the

correct access). All bytes in this region will read back as 0x00

(with no error).

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