SPRUIM2H May 2020 – October 2023 AM2431 , AM2432 , AM2434 , AM6411 , AM6412 , AM6421 , AM6422 , AM6441 , AM6442
The following sequence will occur for each VBUSM read which is sent to the source interface:
RINGACC extracts ring number from incoming read transaction address
RINGACC looks up ring state using ring number
RINGACC calculates effective read address using ring base + ring_index
RINGACC increments HW index and decrements HW occupancy for ring
RINGACC re-evaluates pending bit for ring
RINGACC munges cid to add indicator in 4 MSBs to reconstitute routeid for returning read data
RINGACC pushes altered caddress, cid and unaltered remainder of command attributes to output fifo (note routeid is not included)
At a later time when read data returns:
RINGACC recovers original cid, crouteid, and ring number from scoreboard
RINGACC increments SW index and decrements SW occupancy for ring
RINGACC pushes restored rrouteid, rid, and unaltered read data,status, and other control signals to output read FIFO