XRT94L43
157
SONET/SDH OC-12 TO 12XDS3/E3 MAPPER
REV. 1.0.2
U4
RxD_DP
I
TTL
STS-12/STM-4 Receive Telecom Bus - Parity Input Pin:
This input pin can be configured to function as one of the following.
1. The EVEN or ODD parity value of the bits which are input via the
RXD_D[7:0] input pins.
2. The EVEN or ODD parity value of the bits which are being input via the
RXD_D[7:0] input and the states of the RXD_PL and RXD_C1J1 input
pins.
The Receive STS-12/STM-4 Telecom Bus Interface will use this pin to
compute and verify the parity within the incoming STS-12/STM-4 data-
stream.
NOTES:
1.
Any one of these configuration selections can be made by writing
the appropriate value into the Telecom Bus Control register
(Indirect Address = 0x00, 0x37, direct Address = 0x0137.
2.
Tie this pin to GND if the STS-12/STM-4 Telecom Bus Interface is
configured to operate in the Re-Phase ON Mode or is disabled.
T2
RxD_ALARM
I
TTL
Receive STS-12/STM-4 Telecom Bus - Alarm Indicator Input:
This input pin pulses "High" corresponding to any STS-1 signal that is car-
rying the AIS-P indicator.
More specifically, this input pin will be pulsed "High" coincident to when-
ever a byte, corresponding to given STS-1 signal (that is carrying the AIS-P
indicator) is being placed on the Receive STS-12/STM-4 Telecom Bus -
Data Bus Input pins (RxD_D[7:0]). This input pin should be pulled "Low" at
all other times.
NOTES:
1.
If the RxD_ALARM input signal pulses "High" for any given STS-1
signal (within the incoming STS-12), then the XRT94L43 will
automatically declare the AIS-P defect for that particular STS-1
channel.
2.
Tie this pin to GND if the STS-12/STM-4 Telecom Bus Interface
has been configured to operate in the Re-Phase ON Mode or is
disabled.
U3
V3
U2
T1
V5
U1
W1
V1
RxD_D0
RxD_D1
RxD_D2
RxD_D3
RxD_D4
RxD_D5
RxD_D6
RxD_D7
I
TTL
Receive STS-12/STM-4 Receive Telecom Bus - Receive Input Data Bus
pins:
These 8 input pins function as the "Receive STS-12/STM4 Receive Tele-
com Bus" Receive Input data bus. All Incoming STS-12/STM-4 data is
sampled and latched (into the XRT94L43 via these input pins) upon the
rising edge of the RXA_CLK input pin.
NOTES:
1.
1.The user must insure that the MSB (Most Significant bit) of each
incoming byte is input to the RXD_D7 input pin.
2.
The user must also insure that the LSB (Least Significant bit) of
each incoming byte is input to the RXD_D0 input pin.
3.
The user should tie these pins to GND if the STS-12/STM-4
Telecom Bus is not enabled.
STS-12/STM-4 TELECOM BUS INTERFACE - RECEIVE DIRECTION
PIN #SIGNAL NAME
I/O
SIGNAL
TYPE
DESCRIPTION