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: 93/128页
文件大小: 1560K
代理商: RTPXA270C0C312
Electrical, Mechanical, and Thermal Specification
6-3
Intel PXA270 Processor
AC Timing Specifications
5. The processor asserts the PWR_EN signal to enable the power supplies VCC_CORE,
VCC_SRAM, and VCC_PLL. These supplies can turn on in any order but must all be
established within 125 milliseconds of the assertion of PWR_EN.
6. The external power-control subsystem de-asserts nVDD_FAULT to signal that all system
power supplies have been properly established.
7. The processor de-asserts nRESET_OUT and enters run mode, executing code from the reset
vector.
Note: nBATT_FAULT must be high before nRESET is de-asserted. Otherwise, the processor will not
begin the power-on sequencing event. nVDD_FAULT is sampled only when the SYS_DEL and
PWR_DEL timers have expired. Refer to the Intel PXA27x Processor Family Developer’s
Manual, “Initial Power On” and “Deep-Sleep Exit States” for a state diagram.
Figure 6-2. Power On Reset Timing
Table 6-2. Power-On Timing Specifications (Sheet 1 of 2)(OSCC[CRI] = 0)
Symbol
Description
Min
Typical
Max
Units
t1
Delay from VCC_BATT assertion to
nRESET de-assertion
10
ms
t2
Delay from nRESET de-assertion to
SYS_EN assertion
101
ms
t3
Delay from SYS_EN assertion to
PWR_EN assertion
125
ms
t4
Power supply stabilization time (time to
the deassertion of nVDD_FAULT after the
assertion of PWR_EN)
120
ms
t5
Delay from the assertion of PWR_EN to
the de-assertion of nRESET_OUT
125
ms
tbramp
VCC_BATT power-on Ramp Rate
10
12
mV/uS
VCC_USB, VCC_IO, VCC_MEM,
VCC_BB, VCC_LCD, VCC_USIM
VCC_CORE, VCC_SRAM,
VCC_PLL
nBATT_FAULT
nRESET
SYS_EN
PWR_EN
nVDD_FAULT
VCC_BATT
nRESET_OUT
t1
t3
t5
t2
t4
tsysramp
tbramp
tpwrramp
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