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STANDARD PRODUCT
PM8315 TEMUX
DATASHEET
PMC-1981125
ISSUE 7
HIGH DENSITY T1/E1 FRAMER WITH
INTEGRATED VT/TU MAPPER AND M13 MUX
PROPRIETARY AND CONFIDENTIAL
63
SDV5
Output
Tristate
A9
System Drop Bus Payload Indicator (SDV5).
The
payload indicator locates the position of the floating
payloads for each tributary within the SBI bus structure.
Timing differences between the tributary timing and the
synchronous SBI bus are indicated by adjustments of
this payload indicator relative to the fixed SBI bus
structure.
All timing adjustments indicated by this signal are
accompanied by appropriate adjustments in the SDPL
signal.
The TEMUX only drives the payload Indicator signal
during the tributary timeslots assigned to this device.
SDV5 is updated on the rising edge of SREFCLK.
This signal shares a pin with IFP[28].
SBIACT
Output A8
SBI Output Active (SBIACT).
The SBI Output Active
indicator is high whenever the TEMUX is driving the
SBI drop bus signals. This signal is used by other
TEMUXs or other SBI devices to detect SBI
configuration problems by detecting other devices
driving the SBI bus during the same tributary as the
device listening to this signal.
This output is updated on the rising edge or SREFCLK.
SBIDET[0]
SBIDET[1]
Input
C8
A7
SBI Bus Activity Detection (SBIDET[1:0]).
The SBI
bus activity detect input detects tributary collisions
between devices sharing the same SBI bus. Each SBI
device driving the bus also drives an SBI active signal
(SBIACT). This pair of activity detection inputs monitors
the active signals from two other SBI devices. When
unused this signal should be connected to ground.
A collision is detected when either of SBIDET[1:0]
signals are active concurrently with this device driving
SBIACT. When collisions occur the SBI drivers are
disabled and an interrupt is generated to signal the
collision.
These signals are sampled on the rising edge of
SREFCLK.
SBIDET[1] is shared with serial interface signal ED[7].
Microprocessor Interface