xrt94l33 Exar Corporation, xrt94l33 Datasheet - Page 53

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

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3-CHANNEL DS3/E3/STS-1 TO STS-3/STM-1 MAPPER IC DATA SHEET
B14
STS1TXA_DP_0
RXDS3POS_0
I
TTL
STS-1 Transmit Telecom Bus – Parity Input pin/Receive
DS3/E3/STS-1 Positive-Polarity Data 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 –
STS1TXA_DP_0 - STS-1 Transmit Telecom Bus Interface #
0 – Parity Input Pin:
This input pin can be configured to function as one of the
following.
The EVEN or ODD parity value of the bits which are input via
the “STS1TXA_D_0[7:0]” input pins.
The EVEN or ODD parity value of the bits which are being
input via the “STS1TXA_D_0[7:0]” input, and the states of the
“STS1TXA_PL_0” and “STS1TXA_C1J1_0” input pins.
Note:
If STS-1 Telecom Bus (Channel 0) has NOT been enabled -
RXDS3POS_0 (Receive DS3/E3/STS-1 Positive-Polarity
data input from LIU)
The DS3/E3 Framer block and the Receive STS-1 TOH
Processor block (associated with Channel 0) will sample the
data being applied to this input pin upon the user-selected
edge of the “RXDS3LINECLK_0” input signal.
If the user has configured Channel 0 to operate in the STS-1
Mode, or in the Single-Rail Mode (if also configured to operate
in the DS3/E3 Mode), then all Recovered DS3, E3 or STS-1
data (from the DS3/E3/STS-1 LIU IC) should be applied to this
input pin.
If the user has configured Channel 0 to operate in both the
DS3/E3 and the Dual-Rail Mode, then only the “positive-
polarity” portion of the Recovered DS3/E3 data should be
applied to this input pin.
53
The user can make any one of these configuration
selections by writing the appropriate value into the
“Interface Control
(Address Location = 0x013B).
Register – Byte 0” register
XRT94L33
Rev.1.2.0.