PCF7936AS datasheet(15/32 Pages) PHILIPS

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NXP Semiconductors

Product Specification

Security Transponder (HITAG2)

PCF7936AS

2010 May 04

CONFIDENTIAL

HALT

The command HALT may be issued in AUTHORIZED state

and forces the device to enter the HALT state. For data

integrity reasons the 5 bit command and its complement

have to be send, before the device will accept it, see

Figure 10. If accepted, the command Response consist of

the command itself and its complement.

The 10 bit command sequence may be repeated several

times, if desired, to increase the data integrity level. In the

case that one of the 5 bit commands and its complement

do not match, an error condition occurs that causes the

device to terminate the command, to initialize the device

and to enter the WAIT state. No command Response will

be send by the device in this case.

If the device is configured for Password mode (ENC = 0)

the command sequence is transmitted in plain, while in

Cipher mode (ENC = 1) the whole command sequence is

transmitted ciphered.

READ_PAGE

The command READ_PAGE returns the content of the

designated page. The page designated for reading is

specified by the command bits pg2 to pg0. For data

integrity reasons the 5 bit command and its complement

have to be send, before the device will accept it, see

Figure 11. If accepted, the command Response consists of

the 32 bit content of the designated page. The MSB is send

first.

The 10 bit command sequence may be repeated several

times, if desired, to increase the data integrity level. In the

case that one of the 5 bit commands and its complement

do not match, an error condition occurs that causes the

device to terminate the command, to initialize the device

and to enter the WAIT state. No command Response will

be send by the device in this case.

Subsequent commands may be issued after termination of

tWAIT,Bs.

Any attempt to read a page that is protected against

reading, will be detected and cause an error condition,

upon which the device terminates the command during

tWAIT,Tr and enters the WAIT state. No Response will be

send in this case.

If the device is configured for Password mode (ENC = 0)

the command sequence is transmitted in plain, while in

Cipher mode (ENC = 1) the whole command sequence is

transmitted ciphered.

SEND to

Transponder

RECEIVED from

Transponder

0 0 0 0 1

1 1 1 1 1

tWAIT,Tr

0 0 0 0 1

CM[4:0]

HALT

1 1 1 1 0

CM[4:0]

1 1 1 1 0

CM[4:0]

Figure 10. HALT timing

SEND to

Transponder

RECEIVED from

Transponder

1 1, pg2, pg1, pg0

1 1 1 1 1

tWAIT,Tr

CM[4:0]

tWAIT,Bs

READ_PAGE

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

0 0, pg2, pg1, pg0

CM[4:0]

Data

Figure 11. READ_PAGE timing

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