PCF5083HSLASH5V2SLASHF3 datasheet(66/136 Pages) PHILIPS

66 / 136 page

1996 Oct 29

Philips Semiconductors

Objective speciﬁcation

GSM signal processing IC

PCF5083

CI_decrypt_init (note 1)

Initialization for CI_decrypt. The decrypt_ﬂag enables or disables

decryption.

decrypt_ﬂag = 0, means no decryption.

decrypt_flag = 1, decryption according to A5/1.

decrypt_flag = 2, decryption according to A5/2

t1 is absolute Frame Number (FN) divisor 26

× 51 (0 to 2047,11 bits).

t2 is absolute Frame Number (FN) modulo 26 (0 to 25, 5 bits)

t3 is absolute Frame Number (FN) modulo 51 (0 to 50, 6 bits)

key[0 to 3] contains 64 bits of the ciphering key Kc in accordance with

“GSM Rec. 03.20”. The bits are loaded by the algorithm in LSB ﬁrst order

(ﬁrst bit = LSB {key[0]}, last bit = MSB {key[3]}).

The A8 algorithm delivers 8 bytes kc[0] to kc[7]. The mapping between kc

and key is as follows:

key[0] = kc[6] << 8; kc[7]

key[1] = kc[4] << 8; kc[5]

key[2] = kc[2] << 8; kc[3]

key[3] = kc[0] << 8; kc[1]

decrypt_ﬂag

key[4]

−

CI_encrypt

Encryption of n_bursts normal bursts, info_buff_id determines the buffer

where the information bits of the ﬁrst burst are stored.

info_buff_id

n_bursts

−

CI_encrypt_init

Initialization for CI_encrypt. The encrypt_ﬂag enables or disables

encryption.

decrypt_ﬂag = 0, means no encryption.

decrypt_ﬂag = 1, encryption according to A5/1.

decrypt_ﬂag = 2, encryption according to A5/2.

t1 is absolute Frame Number (FN) divisor 26

× 51 (0 to 2047,11 bits).

t2 is absolute Frame Number (FN) modulo 26 (0 to 25, 5 bits)

t3 is absolute Frame Number (FN) modulo 51 (0 to 50, 6 bits)

Key[0 to 3] contains 64 bits of the ciphering key Kc in accordance with

“GSM Rec. 03.20”. The bits are loaded by the algorithm in LSB ﬁrst order

(ﬁrst bit = LSB {key[0]}, last bit = MSB {key[3]}).

The A8 algorithm delivers 8 bytes kc[0] to kc[7]. The mapping between kc

and key is as follows:

key[0] = kc[6] << 8; kc[7]

key[1] = kc[4] << 8; kc[5]

key[2] = kc[2] << 8; kc[3]

key[3] = kc[0] << 8; kc[1]

encrypt_ﬂag

key[4]

−

DESCRIPTION

PARAMETERS

RETURN

VALUES

PCF5083H/5V2/F3 数据表(PDF) 66 Page - NXP Semiconductors

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