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M-986-2R2PL Scheda tecnica(PDF) 2 Page - Clare, Inc. |
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M-986-2R2PL Scheda tecnica(HTML) 2 Page - Clare, Inc. |
2 / 13 page Configuration Bytes Configuration Byte 1 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 0 0 ECLK IOM ENC1 EOD1 CMP1 FB1 ECLK Channels 1 & 2 1 = External codec clock; 0 = Internal codec clock IOM Channels 1 & 2 1 = Binary input/output; 0 = 2-of-6 input/output ENC1 Channel 1 1 = Enable channel; 0 = Disable channel EOD1 Channel 1 1 = Indicate end of digit; 0 = No end of digit indication CMP1 Channel 1 1 = Automatic Compelled mode; 0 = Manual mode FB1 Channel 1 1 = Forward mode (Tx forward frequencies and Rx backward frequencies) 0 = Backward mode (Tx backward frequencies and Rx forward frequencies) Configuration Byte 2 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 0 1 0 0 ENC2 EOD2 CMP2 FB2 ENC2 Channel 2 1 = Enable channel; 0 = Disable channel EOD2 Channel 2 1 = Indicate end of digit; 0 = No end of digit indication CMP2 Channel 2 1 = Automatic Compelled mode; 0 = Manual mode FB2 Channel 2 1 = Forward mode (Tx forward frequencies and Rx backward frequencies) 0 = Backward mode(Tx backward frequencies and Rx forward frequencies) www.clare.com 2 M-986-2R2 Rev. 3 Function Description The M-986 can be set up for various operating modes by writing two configuration bytes to the coprocessor port. Configuration Options External/Internal Codec Clock (ECLK): If external codec clocking is selected, an external clocking source provides an 8kHz transmit framing clock and an 8kHz receive framing clock. It also provides a serial bit clock with a frequency that is a multiple of 8 kHz between 2.496 MHz and 216 kHz for exchange of data via the serial ports. When internal codec clocking is selected, the M-986 provides an 8kHz framing clock and a 2.048 MHz serial bit clock. Binary/2 of 6 Input/Output (IOM): When the 2-of-6 input/output is selected, the M-986 encodes the received R2 MF tone pair into in a 6-bit format, where each bit represents one of the six possible frequencies. A logic high level indicates the presence of a frequen- cy. The digital input to the M-986 that selects the trans- mitted R2 MF tone pair must also be coded in the 2-of-6 format. When binary input/output is selected, the M-986 encodes the received R2 MF tone pair into a 4 bit bina- ry format. The digital input to the M-986 that selects the transmitted R2 MF tone pair must also be coded in a 4 bit binary format. Enable/Disable Channel (ENC): When a channel is disabled, the receiver does not process its codec input for R2 MF tones, and the transmitter does not respond to transmit commands. If a transmit command is given while the channel is enabled, the “tone off” command must be given before the channel is disabled. Disabling the channel does not automatically shut off the transmitter. When a channel is enabled, the receiv- er and transmitter for that channel function normally. End-of-Digit Indication (EOD): The end-of-digit indica- tion option configures the M-986 to inform the host processor when the far end terminates transmission of the R2 MF tone it is sending. If this option is disabled, the host processor will not be notified when tone transmission terminates. Automatic Compelled/Manual Sequence Signaling (CMP): When manual mode is selected, R2 MF tone transmission is turned on and off only via command from the host processor. If the automatic mode is selected, the transmitter and receiver perform the compelled signaling handshake automatically. The specifics of operation are different for the forward and backward configurations. In forward mode, the transceiver can exist in two states, STATE 1 and STATE 2: • STATE 1: No backward signal detected. Transmitter under control of the host. • STATE 2: Backward signal detected. Transmitter off unconditionally. |
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