LM3S5R31 Datasheet, PDF (544/1275 Pages) Texas Instruments – Stellaris® LM3S5R31 Microcontroller

External Peripheral Interface (EPI)
Bit/Field
16
15:7
6:4
3
2:0
Name
RSERR
reserved
WRFIFO
reserved
RDFIFO
Type
R/W
RO
R/W
RO
R/W
Reset
0
0x00
0x3
Description
Read Stall Error
Value Description
0 The Read Stalled error interrupt is disabled. Reads behave as
normal and are stalled until any preceding writes have completed
and the read has returned a result.
1 This bit enables the Read Stalled error interrupt (RSTALL in the
EPIEISC register) to be generated when a read is attempted
and the WFIFO is not empty. The read is still stalled during the
time the WFIFO drains, but this error notifies the application
that this excess delay has occurred.
Note that the configuration of this bit has no effect on non-blocking reads.
Software should not rely on the value of a reserved bit. To provide
compatibility with future products, the value of a reserved bit should be
preserved across a read-modify-write operation.
Write FIFO
This field configures the trigger point for the WFIFO.
Value Description
0x0 Trigger when there are any spaces available in the WFIFO.
0x1 reserved
0x2 Trigger when there are up to 3 spaces available in the WFIFO.
0x3 Trigger when there are up to 2 spaces available in the WFIFO.
0x4 Trigger when there is 1 space available in the WFIFO.
0x5-0x7 reserved
0
Software should not rely on the value of a reserved bit. To provide
compatibility with future products, the value of a reserved bit should be
preserved across a read-modify-write operation.
0x3
Read FIFO
This field configures the trigger point for the NBRFIFO.
Value Description
0x0 reserved
0x1 Trigger when there are 1 or more entries in the NBRFIFO.
0x2 Trigger when there are 2 or more entries in the NBRFIFO.
0x3 Trigger when there are 4 or more entries in the NBRFIFO.
0x4 Trigger when there are 6 or more entries in the NBRFIFO.
0x5 Trigger when there are 7 or more entries in the NBRFIFO.
0x6 Trigger when there are 8 entries in the NBRFIFO.
0x7 reserved
544
January 20, 2012
Texas Instruments-Production Data