XRT94L33IB-L Exar Corporation, XRT94L33IB-L Datasheet - Page 318

• 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 – Write the value “0” into Bit 4 (E1 Insert Method) within the “Transmit STS-3c Transport –
SONET Transmit Control Register – Byte 1; as depicted below.
Transmit STS-3Transport – SONET Transmit Control Register – Byte 1 (Address = 0x1902)
This step configures the Transmit STS-3c TOH Processor block to use the “TxPOH Input” port as the source
for the E1 byte, within each outbound STS-3c frame. In this mode, the Transmit STS-3c TOH Processor
block will accept the value, corresponding to the E1 byte (via the “TxPOH_n” input port) and it will write this
data into the E1 byte position, within the “outbound” STS-3c frame.
Using the “TxPOH_n Input” port to insert the E1 byte value into the “outbound” STS-3c data-stream
If the user intends to externally insert the E1 byte into the outbound STS-3c data-stream, 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 68.
Figure 68 A Simple Illustration of the “External Circuit” being interfaced to the “TxPOH Input Port”
Note:
B
R/O
IT
0
7
The “TxPOHIns_n” line (in Figure 68) is “dashed” because this controlling this signal is not necessary if the user
Reserved
has executed “STEP 2” above.
B
R/O
IT
0
6
XRT94L43 Device
E2 Insert
Method
B
R/W
IT
X
3-CHANNEL DS3/E3/STS-1 TO STS-3/STM-1 MAPPER IC DATA SHEET
5
TxPOHEnable_n
TxPOHFrame_n
TxPOHClk_n
TxPOHIns_n
TxPOH_n
E1 Insert
Method
B
R/W
IT
0
4
318
F1 Insert
Method
B
R/W
IT
X
3
TxPOHData_OUT
TxPOHFrame_IN
TxPOHEnable_IN
TxPOH_INSERT
TxPOHClk_IN
External Circuit
S1 Insert
Method
B
R/W
IT
X
2
K1K2 Insert
Method
B
R/W
IT
X
1
xr
M0M1 Insert
Method[1]
B
R/W
IT
X
0