xrt94l33 Exar Corporation, xrt94l33 Datasheet - Page 50
xrt94l33
Manufacturer Part Number
xrt94l33
Description
Multi-channel, Multi-function Device Aggregates 3 Ds3/e3/sts-1 Into Oc3/stm-1
Manufacturer
Exar Corporation
Datasheet
1.XRT94L33.pdf
(465 pages)
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XRT94L33
Rev.1.2.0.
D14
RXDS3LINECLK_0
STS1TXA_C1J1_0
3-CHANNEL DS3/E3/STS-1 TO STS-3/STM-1 MAPPER IC DATA SHEET
I
TTL
STS-1 Transmit Telecom Bus C1/J1 Byte Phase Indicator
Input Signal/Receive DS3/E3/STS-1 Clock Input from LIU
(Channel 0):
The exact function of this pin depends upon whether the STS-
1 Telecom Bus Interface for Channel 0 has been enabled or
not.
If STS-1 Telecom Bus (Channel 0) has been enabled - STS-
1 Transmit Telecom Bus C1/J1 Byte Phase Indicator Input
Signal (Channel 0):
This input pin should be pulsed “high” during both of the
following conditions.
Whenever the C1 byte is being input to the STS-1 Transmit
Telecom Bus (TXA_D_0[7:0]) input pins.
Whenever the J1 byte is being input to the STS-1 Transmit
Telecom Bus (TXA_D_0[7:0]) input pins.
This input pin should be pulled “low” at all other times.
If STS-1 Telecom Bus (Channel 0) has NOT been enabled -
RXDS3LINECLK_0 (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 0) uses this input
pin to sample and latch the data that is present on the
RxDS3POS_0 and RxDS3NEG_0 (for Dual-Rail Operation
only) inputs.
timing source for the Ingress Direction signal and circuitry
within the DS3/E3 Framer block of Channel 0.
The user is expected to connect this input to the Recovered
Clock Output of a DS3/E3/STS-1 LIU IC.
50
This input clock signal also functions as the
xr
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