XRT86L30
REV. 1.0.1
SINGLE T1/E1/J1 FRAMER/LIU COMBO
RECEIVE SERIAL DATA OUTPUT
S
IGNAL
NAME
P
IN
#
TYPE
DESCRIPTION
RxSYNC
33
I/O
Receive Single Frame Sync Pulse Input/Output
This pin is configured to be an input if the slip buffer is enabled in the receive
path. Otherwise, this pin is an output signal.
DS1/E1 (RxSYNC as an Input)
RxSYNC must pulse "High" for one period of RxSERCLK and repeat every
125µS. The framer will output the first bit of an inbound DS1/E1 frame during
the provided RxSYNC pulse.
NOTE
:
It is imperative that the RxSYNC input signal be synchronized with
RxSERCLK.
DS1/E1 (TxSYNC as an output)
RxSYNC will pulse "High" for one period of RxSERCLK when the receive pay-
load data Input Interface is processing the first bit of an inbound DS1/E1 frame.
Framer Bypass Mode
In framer bypass mode, RxSYNC is used for the negative digital output pin to
the LIU.
RxCRCSYNC
RxCASYNC
RxSERCLK
39
30
42
O
O
Multiframe Sync Pulse Output
This DS1 only signal will pulse "High" for one period of RxSERCLK the instant
that the Receive payload data Interface is processing the first bit of a DS1 Multi-
frame.
Receive CAS Multiframe Sync Output Signal
This E1 only signal will pulse "High" for one period of RxSERCLK the instant
that the Receive payload data Interface is processing the first bit of an E1 CAS
Multi-frame.
I/O
Receive Serial Clock Signal
This clock signal is used by the Receive payload data Output Interface to latch/
update the contents of RxSER. The output data on RxSER can be updated on
either the rising edge or the falling edge of RxSERCLK. This pin is configured to
be an input if the slip buffer is enabled in the receive path. Otherwise, this pin is
an output signal.
DS1/E1 Non-Multiplexed High-Speed Backplane Interface (Input Only)
In the non-multiplexed high-speed interface mode, this pin is used as the timing
source for the high-speed output data to RxSER. The non-multiplexed modes
supported are MVIP 2.048MHz, 4.096MHz, and 8.192MHz.
NOTE: For DS1 mode, the DS-0 data is mapped into an E1 frame by ignoring
every fourth time slot (don’t care).
DS1/E1 Multiplexed High-Speed Backplane Interface (Input Only)
In the multiplexed high-speed interface mode, this pin is used as the timing
source for the high-speed output data to RxSER. The multiplexed modes sup-
ported are 12.352MHz (DS1 only), 16.384MHz, 16.384MHz HMVIP, and
16.384MHz H.100.
For DS1 mode in 16.384MHz rate, the DS-0 data is mapped into an E1
frame by ignoring every fourth time slot (don’t care).
Framer Bypass Mode:
In framer bypass mode, RxSERCLK is used for the receive clock to the LIU.
12
EXAR [ EXAR CORPORATION ]
