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MT91L62AN Datasheet(PDF) 4 Page - Mitel Networks Corporation |
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MT91L62AN Datasheet(HTML) 4 Page - Mitel Networks Corporation |
4 / 17 page MT91L62 Advance Information 7-176 Table 2: Bit Clock Rate Selection TxMute pin is high. When either of these pins are low their respective paths function normally. The -Zero entry of Table 1 is used for the quiet code definition. SSI Mode The SSI BUS consists of input and output serial data streams named Din and Dout respectively, a Clock input signal (CLOCKin), and a framing strobe input (STB). A 4.096 MHz master clock is also required for SSI operation if the bit clock is less than 512 kHz. The timing requirements for SSI are shown in Figures 5 & 6. In SSI mode the MT91L62 supports only B-Channel operation. Hence, in SSI mode transmit and receive B-Channel data are always in the channel defined by the STB input. The data strobe input STB determines the 8-bit timeslot used by the device for both transmit and receive data. This is an active high signal with an 8 kHz repetition rate. SSI operation is separated into two categories based upon the data rate of the available bit clock. If the bit clock is 512 kHz or greater then it is used directly by the internal MT91L62 functions allowing synchronous operation. If the available bit clock is 128 kHz or 256 kHz, then a 4096 kHz master clock is required to derive clocks for the internal MT91L62 functions. Applications where Bit Clock (BCL) is below 512 kHz are designated as asynchronous. The MT91L62 will re-align its internal clocks to allow operation when the external master and bit clocks are asynchronous. Control pins CSL2, CSL1 and CSL0 are used to program the bit rates. For synchronous operation, data is sampled from Din, on the falling edge of BCL during the time slot defined by the STB input. Data is made available, on CSL2 CSL1 CSL0 External Clock Bit Rate (kHz) CLOCKin (kHz) 1 0 0 128 4096 1 0 1 256 4096 0 0 0 512 512 0 0 1 1536 1536 0 1 0 2048 2048 0 1 1 4096 4096 Figure 3 - Audio Gain Partitioning Serial Port Filter/Codec and Analog Interface PCM Receive Filter Gain 0 dB Receiver Driver 0 dB Aout + Aout- 20k Ω Internal To Device External To Device Default Bypass AIN+ AIN- Transmit Gain 6 dB PCM Analog Input Din Dout Decoder Encoder |
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