TMS320DM647 datasheet(86/166 Pages) TI

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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.

Reserved

R-0

Reserved

SRST

MRST

WRST

POR

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

Field

Value

Description

31:4

Reserved

Reserved. The reserved bit location is always read as 0. A value written to this field has no effect.

SRST

System reset

System Reset was not the last reset to occur.

System Reset was the last reset to occur.

MRST

Max reset

Max Reset was not the last reset to occur.

Max Reset was the last reset to occur.

WRST

Warm reset

Warm Reset was not the last reset to occur.

Warm Reset was the last reset to occur.

POR

Power-on reset

Power-on Reset was not the last reset to occur.

Power-on Reset was the last reset to occur.

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

tw(POR)

Pulse duration, POR low

(3)ns

tw(RESET)

Pulse duration, RESET low

(1)

C = 1/CLKIN1 clock frequency in ns.

(2)

D = 1/CLKIN2 clock frequency in ns.

(3)

If CLKIN2 is not used, tw(POR) must be measured in terms of CLKIN1 cycles; otherwise, use CLKIN2 cycles.

Peripheral Information and Electrical Specifications

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