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ZL50015 Datasheet(PDF) 88 Page - Zarlink Semiconductor Inc |
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ZL50015 Datasheet(HTML) 88 Page - Zarlink Semiconductor Inc |
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88 / 122 page  ZL50015 Data Sheet 88 Zarlink Semiconductor Inc. When CMM is one, the device is programmed to perform one of the special per-channel transmission modes. Bits PCC0 and PCC1 from connection memory are used to select the per-channel tristate, message or BER test mode as shown in Table 52 on page 88. 24.3 Connection Memory High (CM_H) Bit Assignment Connection memory high provides the detailed information required for µ-law and A-law conversion. ICL and OCL bits describe the Input Coding Law and the Output Coding Law, respectively. They are used to select the expected PCM coding laws for the connection, on the TDM inputs, and on the TDM outputs. The V/D bit is used to select the class of coding law. If the V/D bit is cleared (to select a voice connection), the ICL and OCL bits select between A-law and µ-law specifications related to G.711 voice coding. If the V/D bit is set (to select a data connection), the ICL and OCL bits select between various bit inverting protocols. These coding laws are illustrated in the following table. If the ICL is different than the OCL, all data bytes passing through the switch on that particular connection are translated between the indicated laws. If the ICL and the OCL are the same, no coding law translation is performed. Bit Name Description 15 UAEN Conversion between µ-law and A-law Enable (Message mode only) When this bit is low, message mode has no µ-law/A-law conversion. Connec- tion memory high will be ignored. When this bit is high, message mode has µ-law/A-law conversion, and con- nection memory high controls the conversion method. 14 - 11 Unused Reserved In normal functional mode, these bits MUST be set to zero. 10 - 3 MSG7 - 0 Message Data Bits 8-bit data for the message mode. Not used in the per-channel tristate and BER test modes. 2 - 1 PCC1 - 0 Per-Channel Control Bits These two bits control the corresponding entry’s value on the STio stream. 0 CMM = 1 Connection Memory Mode = 1 If this is high, the connection memory is in the per-channel control mode which is per-channel tristate, per-channel message mode or per-channel BER mode. Note: For proper µ-law/A-law conversion, the CM_H bits should be set before Bit 15 (UAEN bit) is set to high. Table 52 - Connection Memory Low (CM_L) Bit Assignment when CMM = 1 15 14 13 12 11 10 9 876 54 321 0 UA EN 000 0 MSG 7 MSG 6 MSG 5 MSG 4 MSG 3 MSG 2 MSG 1 MSG 0 PCC 1 PCC 0 CMM =1 PC C1 PC C0 Channel Output Mode 0 0 Per Channel Tristate 0 1 Message Mode 10 BER Test Mode 11 Reserved |
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