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MT8982AN Datasheet(PDF) 7 Page - Mitel Networks Corporation |
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MT8982AN Datasheet(HTML) 7 Page - Mitel Networks Corporation |
7 / 19 page ISO-CMOS MT8982 2-37 Write Connect Memory - Set Connection Mode (Cmd0-1: 0,1) The corresponding output channel to the addressed Connect Memory location is configured in connection mode. The Connection Mode Data Byte (Table 2) will be received by the MT8982 in the following data byte. Bits 0 to 4 (SC0-SC4) select the source input channel for switching to this output channel. Bit 5 (STi) selects the input stream. Bit 6 (ODE) enables/ disables tristate for this channel. Bit 7 is unused in connection mode. Read Data Memory (Cmd0-1: 1,0) The contents of the addressed Data Memory location are transmitted to the microcontroller in the following data byte. Write Connect Memory - Set Message Mode (Cmd0-1: 1,1) The corresponding output channel to the addressed Connect Memory location is configured in message mode. The following data byte will be received by the MT8982 and written to the address Connect Memory location. The data byte will be output directly to the corresponding output channel. The following example shows a typical programming sequence for the MT8982. A connection is to be made from stream 1 channel 6 to stream 0 channel 15: • The microcontroller pulls CS low. • The microcontroller transmits eight clock pulses to SCLK and a Command/Address byte, HEX 3E, to RxD. The Command/Address byte addresses output channel 15, stream 0, configures that channel as connection mode and identifies the microcycle as a write to the Connect Memory. • The microcontroller transmits another eight clock pulses to SCLK and sends the Connection Mode Data Byte, HEX 26, to RxD. The Connection Mode Data Byte addresses input channel 6, stream 1 in the Data Memory. Note that at least two microseconds must occur between the two accesses. The connection is now complete. The microcontroller may now check that the connection is correct: • The microcontroller transmits eight clock pulses to SCLK and a Command/Address byte, HEX 3C, to RxD. The Command/Address byte addresses output channel 15, stream 0 and identifies the microcycle as a read from the Connect Memory. • The microcontroller transmits another eight clock pulses to SCLK. The MT8982 outputs the Connect Memory data, HEX 26, on TxD. At least two microseconds must occur between the two accesses to ensure that the MiniDX can clock out the data. • CS goes high to terminate the session. This connection is only in one direction. To make a bidirectional connection the MT8982 must also be programmed to connect stream 0 channel 15 to stream 1 channel 6. Serial Bus Mode When the microport is in serial bus mode the MT8982 is programmed via the two ST-BUS serial streams CSTi0 and CSTi1. Each channel in these two streams is written directly into the corresponding address in the Connect Memory. The data written to the Connect Memory is always the Connection Mode Data Byte as described in Table 2. To set up a connection, the Connection Mode Data Byte is transmitted to the MT8982 on the CSTi stream and channel number which is the same as the desired STo stream and channel number. As long as the device remains in serial bus mode, the Connection Mode Data byte must be transmitted continuously, every frame, to maintain the connection. Message mode is not available when the device is in serial bus mode. Also, neither the Connect Memory nor the Data Memory can be read while the device is in serial bus mode. MITEL’s MT8980, MT9080 and MT8920 devices can all be used as programmable parallel-to-ST-BUS serial interfaces for CSTi0 and CSTi1. Initialization On power up the contents of the Connect Memory can be in any state. In order to prevent false programming of peripheral ST-BUS devices or false data transmission, ODE should be kept low during power up. This will keep the two TDM outputs in high impedance until the MT8982 Connect Memory is programmed. |
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