Receive and Transmit Description

66 Software Developer’s Manual

Figure 3-19. Overall Data Flow

IP/TCP Header
Packet Data
Packet Data
Packet Data
HOST Memory
PCI FIFO
Header
Update
Checksum
Calculation
TX Packet FIFO
IP/TCP Header Buff er

TCP Segmentation Data Flow

Descriptors fetch IP/TCP Header
Prototy pe f etch Packet Data Fetch
Header processing
Checksum
Calculations
Data Fetch Pause
Checksum Header
Insertion
Data Fetch
resume
Header processing
Checksum
Calculations
Data Fetch Pause
Checksum Header
Insertion
Tim e

Events Scheduling