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MT9075AL Datasheet(PDF) 3 Page - Mitel Networks Corporation |
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MT9075AL Datasheet(HTML) 3 Page - Mitel Networks Corporation |
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3 / 78 page  Preliminary Information MT9075A 4-131 Pin Description Pin # Name Description PLCC MQFP 1 66 OSC1 Oscillator Input. This pin is either connected via a 20.000 MHz crystal to OSC2 where a crystal is used, or is directly driven when a 20.000 MHz oscillator is employed (see Figures 6 and 7). Not suitable for TTL compatible oscillator. 2 67 OSC2 Oscillator Output. Not suitable for driving other devices. 368 VSS Negative Power Supply (Input). Digital ground. 469 VDD Positive Power Supply (Input). Digital supply (+5V ± 5%). 5 70 CSTo Control ST-BUS Output. CSTo carries one of the following two serial streams for CAS and CCS respectively: (i) A 2.048 Mbit/s ST-BUS status stream which contains the 30 receive signalling nibbles (ABCDZZZZ or ZZZZABCD). The most significant nibbles of each ST-BUS time slot are valid and the least significant nibbles of each ST-BUS time slot are tristated when control bit MSN (page 01H, address 1AH, bit 1) is set to 1. If MSN=0, the position of the valid and tristated nibbles is reversed. (ii) A 64 kb/s output when the 64 KHz common channel signalling option is selected (page 01H, address 1AH, bit 0, 64KCCS =1) for channel 16. 6 71 CSTi Control ST-BUS Input. CSTi carries one of the following two serial streams for CAS and CCS respectively: (i) A 2.048 Mbit/s ST-BUS control stream which contains the 30 transmit signalling nibbles (ABCDXXXX or XXXXABCD) when page 01H, address 1AH, bit 3, RPSIG=0. When RPSIG=1 this pin has no function. The most significant nibbles of each ST-BUS time slot are valid and the least significant nibbles of each ST-BUS time slot are ignored when control bit MSN (page 01H, address 1AH, bit 1) is set to 1. If MSN=0, the position of the valid and ignored nibbles is reversed. (ii) A 64 kb/s input when the 64 KHz common channel signalling option is selected (page 01H, address 1AH, bit 0, 64KCCS =1) for channel 16. 7 72 DSTo Data ST-BUS Output. A 2.048 Mbit/s serial stream which contains the 30 PCM or data channels received on the PCM 30 line. 8 73 DSTi Data ST-BUS Input. A 2.048 Mbit/s serial stream which contains the 30 PCM or data channels to be transmitted on the PCM 30 line. 974 DS/RD Data/Read Strobe (Input). In Motorola mode (DS), this input is the active low data strobe of the microprocessor interface. In Intel mode (RD), this input is the active low read strobe of the microprocessor interface. 10 83 CS Chip Select (Input). This active low input enables the non-multiplexed parallel microprocessor interface of the MT9075A. When CS is set to high, the microprocessor interface is idle and all bus I/O pins will be in a high impedance state. 11 84 RESET RESET (Input). This active low input puts the MT9075A in a reset condition. RESET should be set to high for normal operation. The MT9075A should be reset after power- up. The RESET pin must be held low for a minimum of 1 µsec. to reset the device properly. 12 85 IRQ Interrupt Request (Output). A low on this output pin indicates that an interrupt request is presented. IRQ is an open drain output that should be connected to VDD through a pull-up resistor. An active low CS signal is not required for this pin to function. 13 - 16 86- 89 D0 - D3 Data 0 to Data 3 (Three-state I/O). These signals combined with D4-D7 form the bidirectional data bus of the microprocessor interface (D0 is the least significant bit). |
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