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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
53
Pin Name
Type
Pin
No.
Function
LAOE
Output AB11
Line Add Bus Output Enable (LAOE).
The Add Bus
output enable signal is asserted high whenever the
Line Add Bus is being driven which is co-coincident
with the Line Add bus outputs coming out of tri-state.
This pin is intended to control an external multiplexer
when multiple TEMUXs are driving the telecom Add
bus during their individual tributaries. This same
function is accomplished with the Add bus tristate
drivers but increased tolerance to tributary
configuration problems is possible with an external
mux. This output is controlled via the LAOE bit in the
TTMP Tributary Control registers.
LAOE is updated on the rising edge of LREFCLK.
LADATA[0]
LADATA[1]
LADATA[2]
LADATA[3]
LADATA[4]
LADATA[5]
LADATA[6]
LADATA[7]
Output
Tristate
AB8
W7
W8
AB9
W9
Y10
AA10
AB10
Line Add Bus Data (LADATA[7:0]).
The add bus data
contains the SONET transmit payload data in byte
serial format. All transport overhead bytes are set to
00h. The phase relation of the SPE (VC) to the
transport frame is determined by the Add Bus
composite timing signal LAC1J1V1 and is SW
selectable to be either 0 or 522. LADATA[7] is the most
significant bit (corresponding to bit 1 of each serial
word, the first bit to be transmitted).
LADATA[7:0] is only asserted during the SONET/SDH
tributaries assigned to this device as determined by the
LAOE bit in the TTMP Tributary Control registers.
LADATA[7:0] is updated on the rising edge of
LREFCLK.