1,004
edits
Changes
Jump to navigation
Jump to search
mLine 180:
Line 180: + + + +
Programming the Ethernet controller (view source)
Revision as of 17:28, 14 November 2007
, 17:28, 14 November 2007→Reusable Components
Performs the same function as the Byte Fetcher (described above) but is hard-wired to address the RXAUTORD (0x01). This is convenient because the Ethernet Controller's AutoRead interface will be used extensively to parse through packets. <tt>AutoRd</tt> is in fact just a wrapper around <tt>GetByte</tt> passing through all signals accept the fixed address input.
Performs the same function as the Byte Fetcher (described above) but is hard-wired to address the RXAUTORD (0x01). This is convenient because the Ethernet Controller's AutoRead interface will be used extensively to parse through packets. <tt>AutoRd</tt> is in fact just a wrapper around <tt>GetByte</tt> passing through all signals accept the fixed address input.
=== Random Access Write (<tt>RAwrToAddr</tt>)
Writing directly to Ethernet Controller RAM requires more work in random access mode requires more work. A 16-bit address needs to be passed in 8 bits at a time and the actual 8-bit data is sent on the third transaction. Because the buffer is sometimes loaded in sequentially, this unit is designed to just increment the address of the previous random access write if the passed in address has a '1' in the MSB. (This would never be a legal address, being out of range.) The calling module, therefore, does not need to store the current write location of the RAM. <tt>wr2BtoAddr</tt> and <tt>wrToAddr</tt> are very convenient for these three transactions.
=== Miscellaneous Components ===
=== Miscellaneous Components ===