cp2200 Silicon Laboratories, cp2200 Datasheet - Page 47

• Manufacturer Part Number: cp2200
• Description: Single-chip Ethernet Controller
• Manufacturer: Silicon Laboratories

11. Transmit Interface
11.1. Overview
The CP2200/1 provides a simple interface for transmitting Ethernet packets requiring the host to only load the
source and destination addresses, length/type, and data into the transmit buffer. All other IEEE 802.3
requirements, such as the preamble, start frame delimiter, CRC, and padding (full-duplex only), are automatically
generated. Figure 16 shows a typical Ethernet packet.
Figure 16. Typical Ethernet Packet
(Automatically padded with
zeros if less than 46 bytes)
Preamble and Start Frame
Destination MAC Address
Data (46 to 1500 bytes)
Length/Type (2 bytes)
Source MAC Address
Delimiter (8 bytes)
CRC (4 bytes)
(6 bytes)
(6 bytes)
Rev. 1.0
CP2200/1
47