CLRC63201TSLASH0FE datasheet(79/163 Pages) PHILIPS

79 / 163 page

Philips Semiconductors

Product Specification Rev. 3.0; May 2003

Multiple Protocol Contactless Reader IC

CL RC632

Confidential

6.4.1

KEY FORMAT

To store a key in the E²PROM, it has to be written in a specific format. Each key byte has to be split into the

lower four bits k0 to k3 (lower nibble) and the higher four bits k4 to k7 (higher nibble). Each nibble is stored

twice in one byte and one of the two nibbles is bit-wise inverted. This format is a precondition for successful

execution of the LoadKeyE2- (see 18.9.1) and the LoadKey-Command (see 18.9.2).

With this format, 12 bytes of the E²PROM memory are needed to store a 6 byte long key.

This is shown in the following table:

Example: For the actual key A0 A1 A2 A3 A4 A5hex the value 5A F0 5A E1 5A D2 5A C3 5A B4 5A A5hex

must be written into the E²PROM.

Note: Although it is possible to load data of any other format into the key storage location of the E²PROM, it

is not possible to obtain a valid card authentication with such a key. The LoadKeyE2-Command (see 18.9.1)

will fail.

6.4.2

STORAGE OF KEYS IN THE E²PROM

The CL RC632 reserves 384 bytes of memory area in the E²PROM to hold Crypto1 keys. It uses no memory

segmentation to mirror the 12 bytes structure of key storage. Thus, every byte of the dedicated memory area

may be the start of a key.

Example: If a key loading cycle starts at the last byte address of an E²PROM block, e.g. key byte 0 is stored

at 12Fhex, the following bytes are stored in the next E²PROM block , e.g. key byte 1 is stored at 130hex, byte 2

at 131hex, up to byte 11 at 13Ahex.

With 384 bytes of memory and 12 bytes needed for one key, 32 different keys may be stored in the

E²PROM.

Note: It is not possible to load a key exceeding the E²PROM byte location 1FFhex.

0 (LSB)

5 (MSB)

n+1

n+2

n+3

n+10

n+11

hex

Master Key Byte

Master Key Bits

E²PROM Byte

Address

Example

k3 k2 k1 k0 k3 k2 k1 k0

k7 k6 k5 k4 k7 k6 k5 k4

Table 6-8: Key Storage Format

CLRC63201T/0FE Datasheet(PDF) 79 Page - NXP Semiconductors

CLRC63201T/0FE Datasheet(HTML) 79 Page - NXP Semiconductors

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL