xrt94l33 Exar Corporation, xrt94l33 Datasheet - Page 188

• 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.
Figure 25: Byte-Format of the ATM Cell that is to be loaded into the “Transmit Cell Insertion” Memory
As a consequence, the user must write in a total of 14 “32-bit words” into the “Transmit Cell Insertion” buffer
for each ATM cell that is written into the “Transmit Cell Insertion” Buffer.
Procedure for Writing a Cell into the “Transmit Cell Insertion Buffer”
The user can write an ATM cell into the “Transmit Cell Insertion Buffer” within the Transmit ATM Cell
Processor block, by executing the following steps.
STEP 1 – Flush the contents of the “Transmit Cell Insertion Buffer”
This is accomplished by executing a “Transmit Cell Insertion Buffer” RESET. The user can perform this
“Transmit Cell Insertion Buffer” RESET by doing the following.
STEP 1a – Write a “0” into Bit 2 (Insertion Memory RESET*), within the “Transmit ATM Cell – Memory
Control” register; as depicted below.
Transmit ATM Cell – Memory Control Register (Address = 0xNF13)
B
R/O
IT
0
7
Unused
B
R/O
IT
0
6
B
R/O
IT
0
3-CHANNEL DS3/E3/STS-1 TO STS-3/STM-1 MAPPER IC DATA SHEET
5
Cell Payload Bytes (48 Bytes)
User Defined Field (3 Bytes)
Header Bytes (4 Bytes)
HEC Byte (1 Byte)
Extraction
RESET*
Memory
B
R/W
IT
1
4
188
Extraction
Memory
CLAV
B
R/W
IT
0
3
Insertion
RESET*
Memory
B
R/W
1->0
IT
2
Insertion
Memory
ROOM
B
R/W
IT
1
1
xr
Write SoC
Insertion
Memory
B
R/W
IT
0
0