參數(shù)資料
型號(hào): PXA270
廠商: Intel Corp.
英文描述: Electrical, Mechanical, and Thermal Specification
中文描述: 電氣,機(jī)械和熱規(guī)格
文件頁數(shù): 69/126頁
文件大?。?/td> 1563K
代理商: PXA270
Electrical, Mechanical, and Thermal Specification
6-5
Intel PXA270 Processor
AC Timing Specifications
6.2.3
Watchdog Reset Timing
Watchdog reset is generated internally and therefore has no external pin dependencies. The
nRESET_OUT pin is the only indicator of watchdog reset; it stays asserted for t
DHW_OUT
. The
timing is similar to that for GPIO reset — see
Figure 6-4
for details.
6.2.4
GPIO Reset Timing
GPIO reset is generated externally, and the source is reconfigured as a standard GPIO as soon as
the reset propagates internally. The clocks module is not reset by GPIO reset, so the timing varies
based on the selected clock frequency. If the clocks and power manager is in a frequency-change
sequence when GPIO reset is asserted (see
Section 5.5.1, “32.768-kHz Oscillator Specifications”
on page 5-9
.), then
Figure 6-4
shows the timing of GPIO reset, and
Table 6-5
shows the GPIO reset
timing specifications.
Note:
When bit GPROD is set in the Power Manager General Configuration register, nRESET_OUT is
not asserted during GPIO reset. For register details, see the “Clocks and Power Manager” chapter
in the
Intel PXA27x Processor Family Developer’s Manual
.
Table 6-4. Hardware Reset Timing Specifications (OSCC[CRI] = 1)
Symbol
Description
Min
Typical
Max
Units
t
6
Delay between nRESET asserted and
nRESET_OUT asserted
< 100 ns
10
ms
t
7
Assertion time of nRESET
6
ms
t
8
Delay between nRESET de-asserted and
nRESET_OUT de-asserted
2256
3265
ms
Figure 6-4. GPIO Reset Timing
GP[1]
nRESET_OUT
nCS0
tA_GPIO<1>
tDHW_OUT_A
tDHW_OUT
tCS0
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