XRT94L33IB-L Exar Corporation, XRT94L33IB-L Datasheet - Page 71

• Manufacturer Part Number: XRT94L33IB-L
• Description: IC MAPPER DS3/E3/STS-1 504TBGA
• Manufacturer: Exar Corporation

Specifications of XRT94L33IB-L

• Applications: Network Switches
• Interface: Bus
• Voltage - Supply: 3.14 V ~ 3.47 V
• Package / Case: 504-LBGA
• Mounting Type: Surface Mount
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

xr
3-CHANNEL DS3/E3/STS-1 TO STS-3/STM-1 MAPPER IC DATA SHEET
AE13
AF13
C15
D21
D15
E20
RxOHENABLE_0
RxOHENABLE_1
RxOHENABLE_2
RxOHCLK_0
RxOHCLK_1
RxOHCLK_2
O
O
CMOS
CMOS
Receive Overhead Data Output Interface – Enable Output
This output pin functions as the “Receive Overhead Enable”
output for the receive system side interface when the
XRT94L33 is configured to operate in DS3/E3 mode, however,
it functions as the “Receive STS-1 Overhead Data” output
when the device is configured to operate in the STS-1 mode.
When configured to operate in DS3/E3 mode:
The channel will assert this output signal for one “RxOHClk_n”
period when it is safe for the local terminal equipment to
sample the data on the “RxOH_n” output pin.
When configured to operate in STS-1 mode:
These output pins, along with “RxOHClk_n”, “RxOHFrame_n”
and “RxOH_n” function as the “Receive STS-1 TOH and POH
Output Port”.
These output pins indicate whether POH or TOH data is being
output via the “RxOH_n” output pins.
These output pins will toggle “high” coincident with when POH
data is being output via the “RxOH_n” output pins.
Conversely, these output pins will toggle “low” coincident with
when TOH data is being output via the “RxOH_n” output pins.
“RxOHClk_n”. As a consequence, external circuitry, receiving
this data, should sample this data upon the rising edge of
“RxOHClk_n”.
Receive Overhead Data Output Interface – clock
This output pin functions as the “Receive Overhead Clock”
output for the receive system side interface when the
XRT94L33 is configured to operate in DS3/E3 mode, however,
it functions as the “Receive STS-1 Overhead Clock” output
when the device is configured to operate in the STS-1 mode.
When configured to operate in DS3/E3 mode:
The channel will output the overhead bits (within the incoming
DS3 or E3 frames) via the RxOH_n output pin, upon the falling
edge of this clock signal.
As a consequence, the user’s local terminal equipment should
use the rising edge of this clock signal to sample the data on
both the “RxOH” and “RxOHFrame” output pins.
Note:
When configured to operate in STS-1 mode:
These output pins, along with “RxOH_n”, “RxOHFrame_n”,
and “RxOHEnable_n” function as the “Receive STS-1 TOH
and POH Output Port”.
These output pins function as the “Clock Output” signals for
the Receive STS-1 TOH and POH Output Port.
“RxOH_n”, “RxSTS1Frame_n” and “RxOHEnable_n” output
pins are updated upon the falling edge of this clock signal.
These output pins are updated upon the falling edge of
71
This clock signal is always active.
XRT94L33
Rev.1.2.0.
The