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[v1-10] 2018-Apr-25

AS39513 − Detailed Description

Direct Commands

The direct commands are used for operations that are not

directly related or conveniently mapped to the memory.

The Direct Command Format is below:

where:

DCOM[2:0] – Direct command index. See the table below.

DPARAM[2:0] – Direct command parameter. Its use is

command dependent as described in the table below.

The direct commands that are available are listed in the table

below.

Figure 52:

Direct Commands

Bit

543

Direct Command

DCOM[2:0]

DPARAM[2:0]

DCOM

Command

Description

3’b000

Reset

Create a master reset pulse that, like a POR, will reset all internal registers and

cause the calibrations registers to be loaded from EEPROM. The DOUT signal

will go high when the reset takes effect and will remain high while the

calibration registers are loaded. This is implemented by generating a rising

edge on the trig_rst input to the AFE.

3’b001

Set IO Mode

Force the digital I/O into a fixed state. The I/O will remain in that state until a

reset or changed by another command. The I/O state is set by DPARAM, with

the following values:

3’b000 = Application mode.

3’b001 = SPI mode. (Also forces 1.92 MHz clock to stay running.)

3’b010 = Scan mode (requires factory access).

3’b010

Read Hardware ID

Reads the one-byte hard-coded hardware identifier. DPARAM is ignored. The

following identifiers are defined:

8’h11 = AS39513 version 2.0.

3’b100

Set Mode

Duplicates the functionality of the RFID Set Mode command. (See that

command for more details.) The CMODE[1:0] parameter for the Set Mode

command is taken from DPARAM[1:0].

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