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MT8981D Datasheet(PDF) 8 Page - Zarlink Semiconductor Inc |
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MT8981D Datasheet(HTML) 8 Page - Zarlink Semiconductor Inc |
8 / 20 page MT8981D Data Sheet 8 Zarlink Semiconductor Inc. If bit 6 of the Control Register is 0, then bits 2 and 0 of each Connection Memory High location function normally (see Fig. 5). If bit 2 is 1, the associated ST-BUS output channel is in Message Mode; i.e., the byte in the corresponding Connection Memory Low location is transmitted on the stream at that channel. Otherwise, one of the bytes received on the serial inputs is transmitted and the contents of the Connection Memory Low define the ST- BUS input stream and channel where the byte is to be found (see Fig. 6). If the ODE pin is low, then all serial outputs are high-impedance. If it is high and bit 6 in the Control Register is 1, then all outputs are active. If the ODE pin is high and bit 6 in the Control Register is 0, then the bit 0 in the Connection Memory High location enables the output drivers for the corresponding individual ST-BUS output stream and channel. Bit 0=1 enables the driver and bit 0=0 disables it (see Fig. 5). Applications Use in a Simple Digital Switching System Fig. 7 and 8 show how MT8981s can be used with MT8964s to form a simple digital switching system. Fig. 7 shows the interface between the MT8981s and the filter/codecs. Fig. 8 shows the position of these components in an example architecture. The MT8964 filter/codec in Fig. 7 receives and transmits digitized voice signals on the ST-BUS input DR, and ST- BUS output DX, respectively. These signals are routed to the ST-BUS inputs and outputs on the top MT8981, which is used as a digital speech switch. Figure 7 - Example of Typical Interface between 8981s and 8964s for Simple Digital Switching System The MT8964 is controlled by the ST-BUS input DC originating from the bottom MT8981, which generates the appropriate signals from an output channel in Message Mode. This architecture optimizes the messaging capability of the line circuit by building signalling logic, e.g., for on-off hook detection, which communicates on an ST-BUS output. This signalling ST-BUS output is monitored by a microprocessor (not shown) through an ST-BUS input on the bottom MT8981. 8981 used as speech switch MT8981 STo0 STi0 STo0 STi0 MT8981 8981 used in message mode for control and signalling DX DR DC MT8964 Filter/Codec Signalling Logic Line Driver and 2- to 4- Wire Converter Line Interface Circuit with 8964 Filter/Codec |
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