LM3S9781 Datasheet, PDF (415/1155 Pages) Texas Instruments – Stellaris® LM3S9781 Microcontroller

Stellaris® LM3S9781 Microcontroller
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
1 This bit enables the Read Stalled error interrupt (RSTALL in the
EPIIC 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.
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.
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 1 to 4 spaces available in the WFIFO.
0x1 reserved
0x2 Trigger when there are 1 to 3 spaces available in the WFIFO.
0x3 Trigger when there are 1 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
June 29, 2010
415
Texas Instruments-Advance Information