Global status register – Sundance SMT335E User Manual
Page 19
Version 1.5
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SMT335E SMT375E User Manual
Global Status Register
STAT 0x033C0000
31–30 29–28 27–26 25–24 23–22 21–20 19–18 17–16
CP0
STAT_INT
CP1
STAT_INT
CP2
STAT_INT
CP3
STAT_INT
CP4
STAT_INT
CP5
STAT_INT
SDBA
STAT_INT
SDBB
STAT_INT
R,10 R,10 R,10 R,10 R,10 R,10 R,10 R,10
15–14
13–12
11–10 9–8 7–6 5–4 3–2 1–0
CP0
STAT
CP1
STAT
CP2
STAT
CP3
STAT
CP4
STAT
CP5
STAT
SDBA
STAT
SDBB
STAT
R,10 R,10 R,10 R,10 R,10 R,10 R,10 R,10
Field
Description (flags active when 1)
CPx STAT(0)
Data available in input FIFO: not(Incoming FIFO Empty Flag)
CPx STAT(1)
Space available in output FIFO: not(Outgoing FIFO Full Flag)
CPx STAT_INT(0)
Input interrupt condition asserted
CPx STAT_INT(1)
Output interrupt condition asserted
The status reflected by STAT_INT depends on the flag settings for the SDBs and the
comm-port burst mode flags, IFBM and OFBM (see comm-port status and control
register).
The Global Status Register is used by the standard boot loader to detect the comm-
port to be used for initial program loading, and is used by interrupt service routines to
detect which link has interrupted in an application using several links simultaneously.