xrt94l33 Exar Corporation, xrt94l33 Datasheet - Page 54

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

XRT94L33
Rev.1.2.0.
C21
STS1TXA_DP_1
RXDS3POS_1
3-CHANNEL DS3/E3/STS-1 TO STS-3/STM-1 MAPPER IC DATA SHEET
I
TTL
STS-1 Transmit Telecom Bus – Parity Input pin/Receive
DS3/E3/STS-1 Positive-Polarity Data Input from LIU
Channel 1:
The exact function of this input pin depends upon whether
STS-1 Telecom Bus Interface # 1 has been enable or not.
If STS-1 Telecom Bus (Channel 1) has been enabled –
STS1TXA_DP_1: STS-1 Transmit Telecom Bus Interface #
1 – 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_1[7:0]” input pins.
The EVEN or ODD parity value of the bits which are being
input via the “STS1TXA_D_1[7:0]” input and the states of the
“STS1TXA_PL_1” and “STS1TXA_C1J1_1” input pins.
Note:
If STS-1 Telecom Bus (Channel 1) has NOT been enabled -
RXDS3POS_1 (Receive DS3/E3/STS-1 Positive-Polarity
data input from LIU – Channel 1)
The DS3/E3 Framer block and the Receive STS-1 TOH
Processor block (associated with Channel 1) will sample the
data being applied to this input pin upon the user-selected
edge of the “RXDS3LINECLK_1” input signal.
If the user has configured Channel 1 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 1 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.
54
selections by writing the appropriate value into the
“Interface Control
(Address Location = 0x013A).
The user can make any one of these configuration
Register – Byte 1” register
xr
–