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Programming the Ethernet controller (view source)
Revision as of 18:21, 19 May 2008
, 18:21, 19 May 2008→The eight states
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=== State interconnect ===
=== State interconnect ===
As described above, these states form the outline of the functional block diagram. This implementation calls for a central ''state register''. Each block reads the state value in the register and enables itself upon seeing its own value. After completion of its function, a block will write a new value to the state register to enable the next block. With several modules writing to the register, usual precautions must be taken to avoid more than one drivers forcing a line simultaneously. All modules must be designed to go to high impedance on their output lines when they are not active.
As described above, these states form the outline of the functional block diagram. This implementation calls for a central ''state register''. Each block reads the state value in the register and enables itself upon seeing its own value. After completion of its function, a block will write a new value to the state register to enable the next block. With several modules writing to the register, usual precautions must be taken to avoid more than one drivers forcing a line simultaneously. All modules must be designed to go to high impedance on their output lines when they are not active.
== Interface ==
== Interface ==