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PCF5083H/F2 数据表(PDF) 71 Page - NXP Semiconductors |
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PCF5083H/F2 数据表(HTML) 71 Page - NXP Semiconductors |
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71 / 136 page  1996 Oct 29 71 Philips Semiconductors Objective specification GSM signal processing IC PCF5083 CM_encoder_TCHFS Channel encoder and interleaver for traffic channel full-rate speech and 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. The taf determines whether the current traffic frame is aligned with the SACCH multiframe structure as described in “GSM Rec. 05.08”: taf = 0; not aligned with SACCH multiframe structure taf = 1; aligned with SACCH multiframe structure. The facch_flag indications: facch_flag = 0; indicates that no FACCH message need 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. 14 dtx_flag taf facch_flag facch_msg[12] txen CM_encoder_TCHFS_init Initialization of CM_encoder_TCHFS. 15 −− CP_audio_loop Combination of: MP_READ_AUDIO_IN_FIFO (SCRATCH_BUFF, 160, −1); MP_WRITE_AUDIO_OUT_FIFO (SCRATCH_BUFF, 160). 16 −− CP_freq_estim Combination of: MP_READ_BBD_IN_FIFO (IQ_BUFF, 167); FB_FREQ_ESTIM (threshold) The fb_freq_estim processes 156 I and Q samples only. 167 samples are read in order to minimize the number of different burst length 81 threshold fb_qual fb_foi CP_freq_estim_offset (PCF5083-3) Combination of: MP_READ_BBD_IN_FIFO_INIT (i_offset, q_offset); MP_READ_BBD_IN_INFO (IQ_BUFF, 167); FB_FREQ_ESTIM (threshold). 37 threshold i_offset q_offset fb_qual fb_foi DESCRIPTION ID PARAMETERS RETURN VALUES |
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