MT9075B Datasheet, PDF (4/102 Pages) Mitel Networks Corporation – E1 Single Chip Transceiver

MT9075B
Data Sheet
Pin Description
Pin #
PLCC MQFP
Name
Description
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). CMOS input switching level.
2 67 OSC2 Oscillator Output. Not suitable for driving other devices.
3 68
V_SS Negative Power Supply (Input). Digital ground.
4 69
V_DD 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.
9 74 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 MT9075B. 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 MT9075B in a reset condition. RESET
should be set to high for normal operation. The MT9075B should be reset after power-
up. The RESET pin must be held low for a minimum of 1µsec. to reset the device
properly.
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