公开(公告)号：EP2330870A1

公开(公告)日：2011-06-08

申请号：EP09168897.8

申请日：2009-08-28

申请人： Freescale Semiconductor, Inc. ,  STMicroelectronics (Rousset) SAS

发明人： Naspolini, Gustavo ,  Scobie, James Andrew Collier ,  Kinowski, Paul

IPC分类号： H05B37/02 ,  H02M3/156 ,  H03K7/08

CPC分类号： H05B37/02 ,  H02M3/156 ,  H03K7/08

摘要： A pulse-width-modulated (PWM) signal [303] controls a driver signal [304] applied to a load device, such as a lamp [106]. A feedback loop samples the driver signal and software at the device adjusts a pulse width of the PWM signal to ensure that a current level of the driver signal is maintained within specified limits. The feedback loop employs a sampling trigger signal [305] to control sampling of the driver signal. An asserting edge and successive negating edge of the sampling trigger signal are established based on comparison of a counter value to a single programmable time value. Accordingly, the sampling trigger signal will have a fixed pulse width.

摘要翻译： 脉冲宽度调制（PWM）信号[303]控制施加到诸如灯[106]的负载装置的驱动器信号[304]。 反馈回路对驱动器信号进行采样，器件上的软件会调整PWM信号的脉冲宽度，以确保驱动器信号的电流电平保持在指定的限度内。 反馈回路采用采样触发信号[305]来控制驱动器信号的采样。 基于计数器值与单个可编程时间值的比较来建立采样触发信号的断言边缘和连续的反相边缘。 因此，采样触发信号将具有固定的脉冲宽度。

公开(公告)号：EP2587376A3

公开(公告)日：2014-04-02

申请号：EP12187977.9

申请日：2012-10-10

申请人： Freescale Semiconductor, Inc.

发明人： Circello, Joseph ,  Scobie, James Andrew Collier

IPC分类号： G06F9/52

CPC分类号： G06F9/526

摘要： An electronic system (100) includes multiple data access components (102, 103, 104) (DACs), a semaphores module (108), and a memory protection unit (110) (MPU). Any of the DACs may issue an access request, which requests access to a shared system resource. A region descriptor associated with the shared system resource specifies default access permissions for the DACs. The semaphores module (108) implements a semaphore for the shared system resource, and produces semaphore signals indicating which one, if any, of the DACs has locked the semaphore for the shared system resource. More particularly, an access evaluation circuit (610, 612) of the MPU receives the default access permissions and the semaphore signals. When the semaphore is properly enabled, as indicated in the region descriptor, the access evaluation circuit (610, 612) produces effective access permissions for the DACs by potentially altering the default access permissions based on the semaphore signals. The MPU grants or denies the access request based on the effective access permissions.

公开(公告)号：EP2587376A2

公开(公告)日：2013-05-01

申请号：EP12187977.9

申请日：2012-10-10

申请人： Freescale Semiconductor, Inc.

发明人： Circello, Joseph ,  Scobie, James Andrew Collier

IPC分类号： G06F9/52

CPC分类号： G06F9/526

摘要： An electronic system (100) includes multiple data access components (102, 103, 104) (DACs), a semaphores module (108), and a memory protection unit (110) (MPU). Any of the DACs may issue an access request, which requests access to a shared system resource. A region descriptor associated with the shared system resource specifies default access permissions for the DACs. The semaphores module (108) implements a semaphore for the shared system resource, and produces semaphore signals indicating which one, if any, of the DACs has locked the semaphore for the shared system resource. More particularly, an access evaluation circuit (610, 612) of the MPU receives the default access permissions and the semaphore signals. When the semaphore is properly enabled, as indicated in the region descriptor, the access evaluation circuit (610, 612) produces effective access permissions for the DACs by potentially altering the default access permissions based on the semaphore signals. The MPU grants or denies the access request based on the effective access permissions.

摘要翻译： 一种电子系统（100）包括多个数据访问部件（102，103，104）（DAC）的，一个信号量模块（108），和一个存储器保护单元（110）（MPU）。 任何DAC的可发出访问请求，请求访问共享系统资源的。 与共享系统资源相关联的区域描述符指定了DAC的默认访问权限。 信号量模块（108）用于实现共享系统资源信号量，并产生信号指示的信号是哪一个，如果有的话，这些DAC的已锁定的共享系统资源的信号量。 更具体地，访问MPU的评估电路（610，612）接收到默认的访问权限和信号量的信号。 当信号量被适当地激活，正如所指出的，该区域描述符，访问评估电路（610，612）基于所述信号量信号潜在地改变默认访问权限产生用于DAC的有效的访问权限。 所述MPU授予或拒绝基于有效的访问权限的访问请求。