Output Flag Register; Input Flag Register; Sdb Update - Sundance Spas SMT335E User Manual

Version 3.0

Output Flag Register

31–24
R,00000000

Input Flag Register

31–24
R,00000000
Field
OTRIGGER
ITRIGGER
OFLAG in the SDB status register will be 1 when there are at least OTRIGGER
spaces available in the output FIFO. OTRIGGER must be programmed with a value
between 1 and 255.
IFLAG in the SDB status register will be 1 when there are at least ITRIGGER words
in the input FIFO. This register must be programmed with a value between 1 and
255.
CLRIF and CLROF do not affect OTRIGGER or ITRIGGER.

SDB update

You should be aware that revisions of the SDB before V3.0.6 have a significantly
different treatment of the status flags and a different address is used to program the
SDB flag levels for input and output. When upgrading from versions before V3.0.6,
you will need to change the code for flag programming and accessing the status bits.
You should use version V3.3.6 or above because previous versions could generate
spurious interrupts on input.
Page 23 of 53
23–16
OTRIGGER
RW,10000000
23–16
R,10000000
Description
Outgoing FIFO trigger. Set to 128 after reset.
Incoming FIFO trigger. Set to 128 after reset.
SMT335E SMT375E User Manual
SDBA_OUTPUTFLAG 0x034C0000
SDBB_OUTPUTFLAG 0x035C0000
15–8
R,00000000
SDBA_INPUTFLAG 0x03440000
SDBB_INPUTFLAG 0x03540000
15–8
R,00000000
7–0
R,10000000
7–0
ITRIGGER
RW,10000000