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CS89712 датащи(PDF) 166 Page - Cirrus Logic |
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CS89712 датащи(HTML) 166 Page - Cirrus Logic |
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166 / 170 page ![]() CS89712 166 DS502PP2 • Inter-Packet Gap Time interval between packets on the Ethernet. Minimum interval is 9.6 ms. • Jabber A condition that results when an Ethernet node transmits longer than between 20 ms and 150 ms. • Packet The entire serial string of bits transmitted over an Ethernet network. This includes the pream- ble, Start-of-Frame Delimiter, Destination Ad- dress, Source Address, Length field, Data field, pad bits (if necessary), and Frame Check Se- quence (FCS, also called CRC). A packet is a frame plus the Preamble and SFD. • Slot Time Time required for an Ethernet Frame to cross a maximum length Ethernet network. One Slot Time equals 512 bit times. • Suspend Used to conserve power. When in Suspend mode, the Ethernet port can be awakened only by software command. •Transfer Moving frame data across the memory bus from the Ethernet port RAM to system RAM. During receive operations, only frame data are transferred (preamble and SFD are stripped off by the CS89712’s MAC engine). The FCS may or may not be transferred, depending on the configuration. Transfers are counted in bytes. • Transmit Collision The receive inputs, RXD+/RXD- (10BASE-T) are active while a packet is being transmitted. • Transmit Request A Transmit Request is issued by the software to initiate the start of a new packet transmission. Suffixes Specific to the Ethernet port These have meaning only at the end of a term: A Accept CMD Command CFG Configure CTL Control Dis Disable E Enable h Indicates the number is hexadecimal iE Interrupt Enable ST Status |
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