xrt94l33 Exar Corporation, xrt94l33 Datasheet - Page 51

• Manufacturer Part Number: xrt94l33
• Description: Multi-channel, Multi-function Device Aggregates 3 Ds3/e3/sts-1 Into Oc3/stm-1
• Manufacturer: Exar Corporation

xr
3-CHANNEL DS3/E3/STS-1 TO STS-3/STM-1 MAPPER IC DATA SHEET
A24
RXDS3LINECLK_1/
STS1TXA_C1J1_1
RxSTS1LineClk_1
I
TTL
Transmit STS-1 Telecom Bus Interface - C1/J1 Byte Phase
Indicator Input Signal – Channel 1/Receive DS3/E3/STS-1
Clock Input from LIU – Channel 1:
The exact function of this pin depends upon whether the STS-
1 Telecom Bus Interface for Channel 1 has been enabled or
not.
If the STS-1 Telecom Bus (Channel 1) has been enabled -
Transmit STS-1 Telecom Bus Interface - C1/J1 Byte Phase
Indicator Input Signal (Channel 1):
This input pin should be pulsed “high” during both of the
following conditions.
Whenever the C1 byte is being input to the Transmit STS-1
Telecom Bus Interface input pins (TXA_D_1[7:0]).
Whenever the J1 byte is being input to the Transmit STS-1
Telecom Bus Interface input pins (TXA_D_1[7:0]).
This input pin should be pulled “low” at all other times.
If the STS-1 Telecom Bus (Channel 1) has NOT been
enabled - RXDS3LINECLK_1 (Receive DS3/E3/STS-1 clock
input from LIU)
The DS3/E3 Framer block and the Receive STS-1 TOH
Processor block (associated with Channel 1) uses this input
pin to sample and latch the data that is present on the
RxDS3POS_1 and RxDS3NEG_1 (for Dual-Rail Operation
only) inputs.
timing source for the Ingress Direction signal and circuitry
within the DS3/E3 Framer block of Channel 1.
The user is expected to connect this input to the Recovered
Clock Output pin of an off chip DS3/E3/STS-1 LIU IC.
51
This input clock signal also functions as the
XRT94L33
Rev.1.2.0.