Information

Table 45-78. Matching possibilities and resulting reception structures
RFEN IRMQ MRP Matched in MB Matched in
FIFO
Reception
structure
Description
No FIFO, only MB, match is always MB first
0 0 X
1
None
2
-
3
None Frame lost by no
match
0 0 X Free
4
- FirstMB
0 1 X None - None Frame lost by no
match
0 1 X Free - FirstMb
0 1 X NotFree - LastMB Overrun
FIFO enabled, no match in FIFO is as if FIFO does not exist
1 0 X None None
5
None Frame lost by no
match
1 0 X Free None FirstMB
1 1 X None None None Frame lost by no
match
1 1 X Free None FirstMb
1 1 X NotFree None LastMB Overrun
FIFO enabled, Queue disabled
1 0 0 X NotFull
6
FIFO
1 0 0 None Full
7
None Frame lost by
FIFO full (FIFO
Overflow)
1 0 0 Free Full FirstMB
1 0 0 NotFree Full FirstMB
1 0 1 None NotFull FIFO
1 0 1 None Full None Frame lost by
FIFO full (FIFO
Overflow)
1 0 1 Free X FirstMB
1 0 1 NotFree X FirtsMb Overrun
FIFO enabled, Queue enabled
1 1 0 X NotFull FIFO
1 1 0 None Full None Frame lost by
FIFO full (FIFO
Overflow)
1 1 0 Free Full FirstMB
1 1 0 NotFree Full LastMb Overrun
1 1 1 None NotFull FIFO
1 1 1 Free X FirstMB
1 1 1 NotFree NotFull FIFO
1 1 1 NotFree Full LastMb Overrun
1. This is a don’t care condition.
2. Matched in MB “None” means that the frame has not matched any MB (free-to-receive or non-free-to-receive).
Functional description
K20 Sub-Family Reference Manual, Rev. 1.1, Dec 2012
1158
Preliminary
Freescale Semiconductor, Inc.
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