PCF7936AS datasheet(17/32 Pages) PHILIPS

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NXP Semiconductors

Product Specification

Security Transponder (HITAG2)

PCF7936AS

2010 May 04

CONFIDENTIAL

START_AUTH (Password Mode)

If configured for Password mode, START_AUTH triggers

the mutual device authentication sequence. If completed

successfully, the device enters AUTHORIZED state and

subsequently supports plain read and write access of the

Transponder Memory, TM. Device authentication employs

the

Password

Basestation,

PSW B,

and

Password

Transponder, PSW T, see Figure 13.

After acceptance of the 5 bit command sequence, the initial

device Response consist of the 32 bit Identifier (IDE) that is

stored in the Transponder Memory. Subsequently, the

interrogating system (e.g. basestation) has to identify itself

towards the device, by issuing the matching 32 bit

Password Basestation, PSW B. The device verifies the

Password received with the one stores in the page 1. If

identical, the final device Response consist of the content

of page 3 that contains the Transponder and Memory

configuration (TMCF) and device Password Transponder

(PSW T). The MSB is send first.

In case the authentication process fails, an error condition

occurs that causes the device to terminate the command

and to enter WAIT state. The device will send no further

Response in this case.

Subsequent commands may be issued after termination of

the final tWAIT,Bs.

For proper command execution, the interrogating system

has to identify itself towards the device within the specified

IDLE time, otherwise the device may generate a power-on

reset condition, upon which the circuitry would be reset and

the transponder initialized, causing the device to enter the

WAIT state.

SEND to

Transponder

RECEIVED from

Transponder

1 1 1 1 1

tWAIT,Tr

IDE

tWAIT,Bs

1 1 0 0 0

CM[4:0]

START_AUTH

bit 31 ..............bit 0

tWAIT,Bs

bit 31 ..............bit 0

Page 1

bit 31 ..............bit 0

tWAIT,Tr

Page 3

1 1 1 1 1

tIDLE

SEND to

Transponder

RECEIVED from

Transponder

Figure 13. START_AUTH timing

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