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BT8110EPJ Datasheet(PDF) 10 Page - List of Unclassifed Manufacturers |
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BT8110EPJ Datasheet(HTML) 10 Page - List of Unclassifed Manufacturers |
10 / 84 page 1.0 Product Description Bt8110/8110B 1.1 Channel Capacity and Configuration Modes High-Capacity ADPCM Processor 1-2 Conexant 100060C 1.1 Channel Capacity and Configuration Modes There are four configurations for the operational mode of the Bt8110/8110B (see Table 1-1). These configurations are established by setting the three mode control bits ([MODE[2:0]) and the enable framer bit [EN_FRMR] in the Mode Control Register [mode; 0x40], in the microprocessor mode or on signal pins in the hardware mode (AD[2:0] and CTRL[0]). Table 1-1 summarizes the configurations and the input code applied to each. In T1 and E1 direct framer interface modes the Bt8110/8110B can connect directly to a T1 or E1 framer providing 24 or 32 full-duplex channels of encoding. These configurations are described in detail in Appendix B and C. 1.1.1 Signal Inputs and Outputs The Bt8110/8110B provides both parallel and serial inputs and outputs. The 8-bit parallel inputs are selected by setting the input PSIGEN high. The serial input is a multiplexed encoder/decoder input to provide interleaved signals. The transfer rate of the serial input and output is one-half the input clock rate (CLOCK). The serial output is also multiplexed in interleaved encoder/decoder operation. ADPCM inputs and outputs appear on the most significant bits. The serial signal input and output words are 8 bits, with the most significant bit (sign bit for PCM) appearing first. When transparent operation is selected for a given channel for either an encoder or a decoder, all 8 bits are transferred without modification from the input to both the serial and parallel outputs. NOTE: The exception is with the Bt8110 when the parallel interface is selected in the direct T1/E1 framer interface mode; then the decoder path PSIG[0] must held at a logic low level. Table 1-1. ADPCM Operational Modes CTRL [1] CTRL [0] Mode Control Function Clock Rate (MHz) Channel Capacity Clock Rate (MHz) Channel Capacity x0 100 Encoder/Decoder Interleaved(1) 6.144 24 Full-duplex 8.192 32 Full-duplex x 0 101 Encoder Only 6.144 48 Half-duplex 8.192 64 Half-duplex x 0 110 Decoder Only 6.144 48 Half-duplex 8.192 64 Half-duplex 0 1 100 Direct Framer Interface 12.352 24 Full-duplex 8.192 32 Full-duplex NOTE(S): (1) Interleaved operation means that the Bt8110/8110B alternates between encoder and decoder operation on consecutive inputs. This requires that the inputs and outputs be interleaved (PCM/ADPCM/PCM, etc.) as well. 2. CTRL[1] and CTRL[0] are available only in the Bt8110B. |
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