XRT94L43_06 Datasheet, PDF (40/328 Pages) Exar Corporation – SONET/SDH OC-12 TO 12XDS3/E3 MAPPER

XRT94L43
REV. 1.0.2
SONET/SDH OC-12 TO 12XDS3/E3 MAPPER
STS-3/STM-1 TELECOM BUS INTERFACE - TRANSMIT DIRECTION
PIN #
SIGNAL NAME
SIGNAL
I/O
TYPE
DESCRIPTION
AD17 STS3TxA_CLK_3
TxSBCLK_3
I
TTL STS-3 Transmit Telecom Bus Clock Input/STM-1 Sub-Rate
Clock/DMO_3 (General Purpose) input Pin:
See definition of Pin # E15 above replacing Channel 0 with Channel
3.
If STS-3/STM-1 Telecom Bus (Channel 3) has been enabled -
STS-3 Transmit Telecom Bus Clock Input - Channel 3:
DMO_3
E14 STS3TxA_PL_0
TxSBFrame_0
RLOL_0
A26 STS3TxA_PL_1
TxSBFrame_1
If STS-3/STM-1 Telecom Bus (Channel 3) is disabled - DMO_3
(General Purpose) Input Pin:
I
TTL Transmit STS-3/STM-1 Telecom Bus Interface - Payload Indica-
tor Signal - Channel 0/RLOL_0 (General Purpose) input Pin:
The function of this input depends upon whether or not theSTS-3/
STM-1 Telecom Bus Interface for Channel 0 has been enabled.
If STS-3/STM-1 Telecom Bus (Channel 0) has been enabled -
Transmit STS-3/STM-1 Telecom Bus Interface - Payload Indica-
tor Signal - Channel 0:
This input pin indicates whether or not Transport Overhead (TOH)
bytes are being input via the TXA_D_0[7:0] input pins.
This input pin should be pulled "Low" for the duration that the STS-3/
STM-1 Transmit Telecom Bus is receiving a TOH byte, via the
TXA_D_0[7:0] input pins.
NOTE: This input signal is sampled upon the falling edge of
STS3TxA_CLK_0.
If STS-3/STM-1 Telecom Bus (Channel 0) is disabled - RLOL_0
(General Purpose) Input Pin.
This input pin can be used as a general purpose input pin.
The state of this input pin can be determined by reading the state of
Bit 1 (RLOL) within the Line Interface Scan Register associated with
Channel 0 (Address = 0x1E, 0x81), (Direct Address = 0x1F81).
NOTE:
For Product Legacy purposes, this pin is called RLOL_0
because one possible application is to tie this input pin to a
RLOL (Receive Loss of Lock) output pin, from one of Exar's
XRT73L0X/XRT75L0X DS3/E3/STS-1 LIU devices.
However, this input pin and the corresponding register bit
can be used for any purpose.
I
TTL Transmit STS-3/STM-1 Telecom Bus Interface - Payload Indica-
tor Signal - Channel 1/RLOL_1 (General Purpose) input Pin:
See definition of Pin # E14 above replacing Channel 0 with Channel
1.
If STS-3/STM-1 Telecom Bus (Channel 1) has been enabled -
Transmit STS-3/STM-1 Telecom Bus Interface - Payload Indica-
tor Signal - Channel 1:
RLOL_1
If STS-3/STM-1 Telecom Bus (Channel 1) is disabled - RLOL_1
(General Purpose) Input Pin:
34