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PCF7936AS

Security Transponder (HITAG2)

NXP Semiconductors. 

NXP Semiconductors

Security Transponder (HITAG2)

Product Specification

PCF7936AS

Error

LF Field

Power On Reset

READ ONLY

time-out (tWAIT,SA)

&

Read Only = enabled

WAIT

START_AUTH

READ_PAGE

READ_PAGE_INV

WRITE_PAGE

AUTHORIZED

HALT

HALT

Figure 7. Transponder State Diagram

7.2 Transponder State Diagram

Device operation is controlled by commands issued from

the basestation, see Figure 7.

After a LF Field Power-On Reset condition the circuitry is

reset and the transponder is initialized, which causes the

device to enter the WAIT state.

If one of the Read Only modes is enabled, the device will

enter READ ONLY state after the specified time-out

(tWAIT,SA), if no command is being issued.

To authenticate the transponder and to access the

Transponder Memory for read and write the AUTHORIZED

state has to be entered, by means of a START_AUTH

command and successful completion of the authentication

sequence. Subsequent memory read and write operations

may be executed.

Operation of the transponder commands depend on the

device configuration (Password or Cipher Mode).

If the device is forced into HALT state, by means of the

HALT command, the transponder circuitry is muted.

A violation of the command sequence coding or command

timing in any state causes an error condition, which causes

the device to enter WAIT state and to reset the time-out

(tWAIT,SA).

7.2.1 WAIT State

In WAIT state general memory access is denied.

Commands may be issued to start device authentication, in

order to enter the AUTHORIZED state, see Table 2.

Table 2. Command Set in WAIT State

NAME

Reserved 1)

Reserved 1)

Reserved 1)

Reserved 1)

Reserved 1)

START_AUTH

COMMAND, CMD

CM4 CM3 CM2 CM1 CM0

0XXXX

X0XXX

XX1XX

XXX1X

XXXX1

1

1

0

0

0

Note

1. This command is reserved for future use and subject to

change without notice. The actual implementation

causes the device to generate an error condition and to

enter the WAIT state, if this command is being issued.

Upon entering the WAIT state the time-out (tWAIT,SA) is

reset. In case tWAIT,SA is allowed to time-out, the device

enters READ ONLY state, if one of the Read Only modes is

enabled. In case a START_AUTH command is issued,

device authentication is triggered and the READ ONLY

state is not entered. At least the first two bits of

START_AUTH need to be recognized by the device within

the time-out period specified by tWAIT,SA.

2010 May 04

11

CONFIDENTIAL

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