参数资料
型号: RTPXA270C0C312
厂商: INTEL CORP
元件分类: 微控制器/微处理器
英文描述: 312 MHz, RISC PROCESSOR, PBGA356
封装: 13 X 13 MM, 1 MM HEIGHT, 0.50 MM PITCH, LEAD FREE, VFBGA-356
文件页数: 95/128页
文件大小: 1560K
代理商: RTPXA270C0C312
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 tDHW_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
t6
Delay between nRESET asserted and
nRESET_OUT asserted
< 100 ns
10
ms
t7
Assertion time of nRESET
6
ms
t8
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
相关PDF资料
PDF描述
RCPXA270C0C520 520 MHz, MICROPROCESSOR, PBGA356
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