Intel Intel Gigabit Ethernet Controllers, PCI-X manual Overall Data Flow

Receive and Transmit Description

		PCI FIFO
IP/TCP Header		Header		Checksum
		Update		Calculation
Packet Data
Packet Data
				TX Packet FIFO
Packet Data
HOST Memory
		IP/TCP Header Buf f er
	TCP Segmentation Data Flow
		Header processing	Header processing
	IP/TCP Header	Data Fetch Pause	Data Fetch	Data Fetch Pause
Descriptors f etch		Packet Data Fetch Checksum Header		Checksum Header
	Prototy pe f etch		resume
		Insertion		Insertion
		Checksum	Checksum
		Calculations	Calculations
		Time
		Ev ents Scheduling

Figure 3-19. Overall Data Flow

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