MT8926AE Zarlink Semiconductor, MT8926AE Datasheet - Page 4

• Manufacturer Part Number: MT8926AE
• Description: MT8926 - T1 Performance Monitoring Adjunct Circuit (PMAC)
• Manufacturer: Zarlink Semiconductor

Pin Description Table (continued)
MT8926
4
Pin #
18
19
20
21
22
23
24
25
26
27
28
Name
DSTi0 Data ST-BUS Input 0. A 2.048 MBit/sec. serial input stream, which contains the 24 PCM or
DSTi1 Data ST-BUS Input 1. A 2.048 MBit/sec. serial input stream, which contains the 24 PCM or
1SEC
FDLo
DSTo
IRQ
V
V
IC
IC
IC
SS
DD
Facility Data Link Output. When bit-oriented messaging is enabled (i.e., PMAC Control
Word bit 0, FDLEn, is high), data in the Transmit BOM register will be appended to a 1111
1111 (FF) flag and clocked out of the device at this output. The output timing for this signal
is shown in Figure 18 on page 30. When bit-oriented messaging is disabled (FDLEn low),
data received at the FDLi pin is routed back out transparently on this pin (it is not re-timed).
See Figure 19 on page 30 for timing information.
1 Second Output. A one second timing signal derived from the ST-BUS F0i signal is output
on this pin. The output is low for 0.5 seconds and high for 0.5 seconds. It can be used as an
interrupt source to generate T1.403 message-oriented performance reports. See Figure 16
on page 29 for timing information.
Interrupt Request Output. An open drain output that is to be externally connected to V
through a pull-up resistor. The PMAC will pull this pin low to assert an interrupt request.
Interrupting events and their groupings are described in Table 16 on page 19 and Table 17
on page 20. IRQ is released by making bit 1 (Interrupt Acknowledge - INTA) of the PMAC
Control Word low. Once INTA is set, all interrupting signals of a particular group must be
inactive before the next interrupt of that group can assert IRQ. See Figure 17 on page 30 for
functional timing information.
Internal Connection. Must be left open for normal operation.
System Ground.
Internal Connection. Must be left open for normal operation.
Data ST-BUS Output. A 2.048 MBit/sec. serial output stream, which contains the 24 PCM
or data channels to be transmitted on the T1 trunk. This data stream is multiplexed from
either input DSTi0 (Normal Mode) or input DSTi1 (Payload Loopback Mode). The selection
of either the Normal or Payload Loopback mode is made through the Loopback Control
Word. This output should be connected to DSTi of the MT8976/77. When the loopback
control word is set for line loopback code generation, the 24 PCM channels will contain the
line loopback activate or deactivate code stream. See Figure 14 on page 28 for timing
information.
data channels to be transmitted on the T1 trunk in Normal Mode. This input should be
connected to the system side output stream.
data channels to be transmitted on the T1 trunk in Payload Loopback Mode. This input
should be connected to DSTo of the MT8976/77.
Internal Connection. Must be tied to V
Supply Voltage Input (+5 V).
SS
Description
for normal operation.
Data Sheet
SEMICMF.019
DD