PCF7936AS datasheet(16/32 Pages) PHILIPS

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NXP Semiconductors

Product Specification

Security Transponder (HITAG2)

PCF7936AS

2010 May 04

CONFIDENTIAL

READ_PAGE_INV

The command READ_PAGE_INV returns the complement

of 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 12. If accepted, the command

Response consists of the complement of the 32 bit content.

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 1, pg2, pg1, pg0

1 1 1 1 1

tWAIT,Tr

CM[4:0]

tWAIT,Bs

READ_PAGE_INV

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

1 0, pg2, pg1, pg0

CM[4:0]

Data

Figure 12. READ_PAGE_INV timing

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