Entity: MdioSeqCore

Title : MDIO Support

Company : SLAC National Accelerator Laboratory

Description: Execute sequence(s) of MDIO transaction(s). A list (array) of all possible transaction sequences is passed in the MDIO_PROG_G generic. Individual (sub-) sequences are separated by the asserted 'theLast' flag in the last instruction of each individual sequence.

A typical MDIO_PROG_G is a concatenation of sequences:

constant MDIO_PROG_C : MdioProgramArray := ( SEQ_1_C & SEQ_2_C & SEQ_3_C );

where each sequence (SEQ_1_C, SEQ_2_C, …) is itself a MdioProgramArray and has in its last instruction the 'last' flag set. E.g.,:

constant SEQ_1_C : MdioProgramArray := ( mdioWriteInst( PHY, REG_0, DATA_0 ); mdioWriteInst( PHY, REG_1, DATA_2 ); mdioReadInst ( PHY, REG_2, true); );

The user would then trigger execution of a particular sequence by

1) setting 'pc' to the index of the starting position of the first instruction of the desired sequence. 2) asserting 'trg' high for one clock cycle.

The sequencer then executes all instructions up to (and including) the last one of a sequence. When done, 'don' is asserted for a single clk cycle. When any read transaction completes 'rs' is asserted for one cycle and readback

data is presented at 'din' (valid while 'don' is asserted).

This file is part of 'SLAC Firmware Standard Library'. It is subject to the license terms in the LICENSE.txt file found in the top-level directory of this distribution and at: https://confluence.slac.stanford.edu/display/ppareg/LICENSE.html. No part of 'SLAC Firmware Standard Library', including this file, may be copied, modified, propagated, or distributed except according to

the terms contained in the LICENSE.txt file.