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6.7.7
Reset Controller Register
6.7.8
Reset Electrical Data/Timing
TMS320DM647/TMS320DM648
Digital Media Processor
SPRS372–MAY 2007
The reset type status (RSTYPE) register is the only register for the reset controller.
6.7.7.1
Reset Type Status Register Description
The reset type status (RSTYPE) register latches the cause of the last reset. If multiple reset sources occur
simultaneously, this register latches the highest priority reset source. The reset type status register is
shown in
Figure 6-9
and described in
Table 6-22
.
31
16
Reserved
R-0
15
4
3
2
1
0
Reserved
SRST
MRST
WRST
POR
R-0
R-0
R-0
R-0
R-0
LEGEND:
R/W = Read/Write; R = Read only; -
n
= value after reset
Figure 6-9. Reset Type Status Register (RSTYPE)
Table 6-22. Reset Type Status Register (RSTYPE) Field Descriptions
Bit
31:4
3
Field
Reserved
SRST
Value
Description
Reserved. The reserved bit location is always read as 0. A value written to this field has no effect.
System reset
System Reset was not the last reset to occur.
System Reset was the last reset to occur.
Max reset
Max Reset was not the last reset to occur.
Max Reset was the last reset to occur.
Warm reset
Warm Reset was not the last reset to occur.
Warm Reset was the last reset to occur.
Power-on reset
Power-on Reset was not the last reset to occur.
Power-on Reset was the last reset to occur.
0
1
2
MRST
0
1
1
WRST
0
1
0
POR
0
1
NOTE
If a configuration pin must be routed out from the device, the internal pullup/pulldown
(IPU/IPD) resistor should not be relied upon; TI recommends the use of an external
pullup/pulldown resistor.
Table 6-23. Timing Requirements for Reset
(1)(2)
(see
Figure 6-10
and
Figure 6-11
)
-720
-900
NO.
UNIT
MIN
MAX
5
6
t
w(POR)
t
w(RESET)
Pulse duration, POR low
Pulse duration, RESET low
(3)
ns
ns
(1)
(2)
(3)
C = 1/CLKIN1 clock frequency in ns.
D = 1/CLKIN2 clock frequency in ns.
If CLKIN2 is not used, t
w(POR)
must be measured in terms of CLKIN1 cycles; otherwise, use CLKIN2 cycles.
Peripheral Information and Electrical Specifications
86
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