MT8960 데이터 시트보기 (PDF) - Mitel Networks
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MT8960 Datasheet PDF : 22 Pages
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MT8960/61/62/63/64/65/66/67 ISO2-CMOS
Logic Control Outputs SD0-5
These outputs are directly controlled by the logic
states of bits 0-5 in Register B. A logic low (GNDD)
in Register B causes the SD outputs to assume an
inactive state. A logic high (VDD) in Register B
causes the SD outputs to assume an active state
(see Table 3). SD0-2 switch between GNDD and VDD
and may be used to control external logic or
transistor circuitry, for example, that employed on the
line card for performing such functions as relay drive
for application of ringing to line, message waiting
indication, etc.
SD3-5 are used primarily to drive external analog
circuitry. Examples may include the switching in or
out of gain sections or filter sections (eg., ring trip
filter) (Figure 7).
MT8962/63/66/67 provides all six SD outputs.
MT8960/61/64/65 each packaged in an 18-pin DIP
provide only four control outputs, SD0-3.
Telephone Set
2 Wire
Analog
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Figure 6 - Typical Line Termination
BITS 0-2
0
1
BIT 3
0
1
LOGIC CONTROL OUTPUTS SD0-SD2
Inactive state - logic low (GNDD).
Active state - logic high (VDD).
LOGIC CONTROL OUTPUT SD3
Inactive state - High Impedance.
Active state - GNDA.
BITS 4,5
0
1
LOGIC CONTROL OUTPUTS SD4, SD5
Inactive state - High Impedance.
Active state - GNDD.
BIT 7 BIT 6
CHIP TESTING CONTROLS
0
0 Normal operation.
0
1 Transmit filter testing, i.e.:
Transmit filter input connected to VX input
Receive filter and Buffer disconnected from VR
1
0 Receive filter testing, i.e.:
Receive filter input connected to VX input
Receive filter input disconnected from codec
1
1 Codec testing i.e.:
Codec analog input connected to VX
Codec analog input disconnected from transmit filter output
Codec analog output connected to VR
VR disconnected from receive filter output
Table 3. Control States - Register B
6-26
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