Chapter 3 — Theory of Operation
72 CV30 Fixed Mount Computer Service Manual
Ethernet Controller Diagram
Signal Description Direction
ETH_TXDP Twisted pair transmit positive Output
ETH_TXDN Twisted pair transmit negative Output
ETH_RXINP Twisted pair receive positive Input
ETH_RXINN Twisted pair receive negative Input
ETH_SA [2:0] Address A1-A3 input (for internal
register selection)
Input
nETH_AEN Address enable Input
TXCVR_SD [15:0] D1-D15, 16-bit data bus. Bi-direction
ETH_RESET Controller reset Input
RDY Asynchronous ready Output
ETH_IRQ INTRO, interrupt to the processor Ouput
nETH_IORD nRD, read strobe Input
nETH_IOWR nWR, write strobe Input
nETH_BE [1:0] nByte enable Input
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