TMS320DM647_08 Datasheet, PDF (84/167 Pages) Texas Instruments – Digital Media Processor

TMS320DM647/TMS320DM648
Digital Media Processor
SPRS372A – MAY 2007 – REVISED JUNE 2007
www.ti.com
6.7.7 Reset Controller Register
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
Reserved
4
3
2
1
0
SRST MRST WRST POR
R-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
R-0 R-0 R-0 R-0
Figure 6-9. Reset Type Status Register (RSTYPE)
Bit Field
31:4 Reserved
3 SRST
2 MRST
1 WRST
0 POR
Table 6-22. Reset Type Status Register (RSTYPE) Field Descriptions
Value Description
Reserved. The reserved bit location is always read as 0. A value written to this field has no effect.
System reset
0 System Reset was not the last reset to occur.
1 System Reset was the last reset to occur.
Max reset
0 Max Reset was not the last reset to occur.
1 Max Reset was the last reset to occur.
Warm reset
0 Warm Reset was not the last reset to occur.
1 Warm Reset was the last reset to occur.
Power-on reset
0 Power-on Reset was not the last reset to occur.
1 Power-on Reset was the last reset to occur.
6.7.8 Reset Electrical Data/Timing
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)
NO.
5
t_w(POR)
6
t_w(RESET)
Pulse duration, POR low
Pulse duration, RESET low
-720
-900
MIN
MAX
UNIT
(3)_ns
ns
(1) C = 1/CLKIN1 clock frequency in ns.
(2) D = 1/CLKIN2 clock frequency in ns.
(3) If CLKIN2 is not used, t_w(POR) must be measured in terms of CLKIN1 cycles; otherwise, use CLKIN2 cycles.
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Peripheral Information and Electrical Specifications
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