NEC Network Controller uPD98502 - Manual (Page 273)

CHAPTER 4 ATM CELL PROCESSOR
Preliminary User’s Manual S15543EJ1V0UM 273
Figure 4-33. Raw Cell Data Format
WORD0 CELL HEADER
WORD1 BYTE2 BYTE1 BYTE0 HEC
:
:
:
WORD12 BYTE46 BYTE45 BYTE44 BYTE43
WORD13 UINFO 0 BYTE47
WORD14 TIME STAMP
WORD15 1 VC NUMBER CE 0
Cell Header Header of the cell except HEC.
HEC HEC field pattern of the cell.
BYTE0 – BYTE47 Payload data of the cell.
UINFO User information. The pattern which user set in UINFO field in VC table.
TIME STAMP A_TSR register value when ATM Cell Processor received the cell.
VC NUMBER VC Number of the cell.
CE CRC-10 check result
0: No error.
1: CRC-10 error is detected.
4.8.3.3 Receive indication
For each packet, ATM Cell Processor writes a receive indication as the reception completion status in the mailbox.
The mailbox used for reception is mailbox 0 and 1. More specifically, ATM Cell Processor writes a receive indication
at the following case:
(1) All cell data that belong to a packet are received.
- No error is detected
- "CRC-32 error" or "Length error " is detected
(2) An error is detected before the last cell of a packet is received. The error is other than "CRC-32 error" or
"Length error ".
A receive indication contains the start address and size of the batch that ATM Cell Processor uses to store the cell,
and other information. By reading the receive indication, the V R 4120A can process the received packet that is
composed of received cells.
The format of a receive indication is as follows: