參數(shù)資料
型號(hào): PCF5083
廠商: NXP Semiconductors N.V.
英文描述: STEEL COVER
中文描述: GSM信號(hào)處理IC
文件頁(yè)數(shù): 66/136頁(yè)
文件大?。?/td> 602K
代理商: PCF5083
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1996 Oct 29
66
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 K
c
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]
CI_encrypt
4
decrypt_flag
t1
t2
t3
key[4]
Encryption of n_bursts normal bursts, info_buff_id determines the buffer
where the information bits of the first burst are stored.
CI_encrypt_init
5
info_buff_id
n_bursts
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 K
c
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]
6
encrypt_flag
t1
t2
t3
key[4]
DESCRIPTION
ID
PARAMETERS
RETURN
VALUES
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