XRT94L33IB-L Exar Corporation, XRT94L33IB-L Datasheet - Page 286

• 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

XRT94L33
Rev.1.2.0.
STEP 2 – Begin providing the values of the “outbound” Z3 byte to the “TxPOH_n” input port.
The procedure for applying the Z3 byte to the “TxPOH_n” input port is presented below.
Using the “TxPOH” Input Port to insert the Z3 byte value into the outbound STS-1 SPE data-stream
If the user intends to externally insert the Z3 byte into the outbound STS-1 SPE, via the “TxPOH_n” input port,
then they must design some external circuitry (which can be realized in an ASIC, FPGA or CPLD solution) to
do to the following.
• Continuously sample the “TxPOHEnable_n” and the “TxPOHFrame_n” output pins upon the rising edge of
the “TxPOHClk_n” output clock signal.
A simple illustration of this “external circuit” being interfaced to the “TxPOH Input Port” is presented below in
Figure 54.
Figure 54 : A Simple Illustration of the “External Circuit” being interfaced to the “TxPOH Input Port”
Note:
• Whenever the “external circuit” samples both the “TxPOHEnable_n” and “TxPOHFrame_n” output pins
“high”, then it should enter a “WAIT STATE” (e.g., where it will wait for 48 periods of “TxPOHClk_n” to
elapse). Afterwards, the external circuit should exit this “WAIT STATE” and then place the very first bit (e.g.,
the most significant bit) of the “outbound” Z3 byte onto the “TxPOH_n” input pin, upon the very next falling
edge of “TxPOHClk_n”. This data bit will be sampled and latched into the “Transmit SONET POH Processor”
block circuitry, upon the very next rising edge of “TxPOHClk_n”.
Note:
• Afterwards, the “external circuit” should serially place the remaining seven bits (of the Z3 byte) onto the
“TxPOH_n” input pin, upon each of the next seven falling edges of “TxPOHClk_n”.
• The “external circuit” should then revert back to continuously sampling the states of the “TxPOHEnable_n”
and “TxPOHFrame_n” output pins and repeat the above-mentioned process.
The “TxPOHIns_n” line (inFigure 54) is “dashed” because controlling this signal is not necessary if the user has
This “WAIT STATE” period is necessary because the Z3 byte is the seventh byte within the POH.
executed “STEP 1” above.
XRT95L34 Device
3-CHANNEL DS3/E3/STS-1 TO STS-3/STM-1 MAPPER IC DATA SHEET
TxPOHEnable_n
TxPOHFrame_n
TxPOHClk_n
TxPOHIns_n
TxPOH_n
286
TxPOHData_OUT
TxPOHFrame_IN
TxPOHEnable_IN
TxPOH_INSERT
TxPOHClk_IN
External Circuit
xr