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): 70/136頁(yè)
文件大小: 602K
代理商: PCF5083
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1996 Oct 29
70
Philips Semiconductors
Objective specification
GSM signal processing IC
PCF5083
CM_encoder_RACH
Channel encoder random access channel. The encoded RACH message is
stored in SCRATCH_BUFF.
bsic contains the 6 bits B(0) to B(5) of the base station identity code in
accordance with “GSM Rec. 05.03” B(0) is stored in the LSB (bit 0) of bsic,
B(5) in bit 5 of bsic. B(0) = MSB of PLMN colour code, B(5) = LSB of BS
colour code.
rach_msg[1] contains the RACH message consisting out of 8 bits. The bits
are stored in LSB first order. Unused MSBs are set to zero.
CM_encoder_TCHDATA
13
bsic
rach_msg[1]
Channel encoder and interleaver for data channels, FACCH and DTX
uplink control.
The dtx_flag determines whether discontinuous transmission (DTX) is
applied:
dtx_flag = 1; DTX is applied
dtx_flag = 0; DTX is not applied.
DTX is valid only for the encoder for full-rate 9.6 kbits/s and half-rate
4.8 kbits/s.
The facch_flag indications:
facch_flag = 0; indicates that no FACCH data must be encoded
facch_flag = 1; indicates that a FACCH message must be encoded.
The facch_msg[12] contains the 184 bits of the FACCH message. The bits
are stored in a packed format with 16-bits per word and LSB first order.
The return value txen is only useful if DTX is applied. It indicates whether
the TCH block will be transmitted over the air interface.
txen = 1; TCH block will be transmitted over the air interface
txen = 0; TCH block will not be transmitted over the air interface.
For data services other than full-rate 9.6 kbits/s and half-rate 4.8 kbits/s
txen will be set to logic 1.
CM_encoder_TCHDATA_init
74
dtx_flag
facch_flag
facch_msg[12]
txen
Initialization of CM_ENCODER_TCHDATA. The parameter data_service
may be one of the following values:
data_service = 0; full-rate = 9.6 kbits/s
data_service = 1; full-rate = 4.8 kbits/s
data_service = 2; full-rate
2.4 kbits/s
data_service = 3; half-rate = 4.8 kbits/s
data_service = 4; half-rate
2.4 kbits/s.
75
data_service
DESCRIPTION
ID
PARAMETERS
RETURN
VALUES
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