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    • 4. 发明申请
    • DMA CONTROL DEVICE AND DATA TRANSFER METHOD
    • DMA控制设备和数据传输方法
    • US20110196994A1
    • 2011-08-11
    • US12675460
    • 2008-08-12
    • Masaaki HaradaTomohiko KitamuraTsutomu Sekibe
    • Masaaki HaradaTomohiko KitamuraTsutomu Sekibe
    • G06F13/28
    • G06F13/28G06F21/85
    • A DMA control device and a data transfer method, which make it possible to use a DMA channel independent of an operation mode of a processor and realize the protection of DMA control parameters during DMA operation (during a data transfer), while reducing the number of shift of an operating mode of the processor as small as possible, are provided. In requesting a DMA start by locking an access to a ch-0 DMA control register 114 in a secure mode, a CPU 101 instructs an unlock set register 118 to release an access lock when the transfer is completed. Then, when a parameter controlling circuit 119 receives a notification of transfer completion from a ch-0 state managing circuit 116, such parameter controlling circuit instructs a lock set register 115 to release the lock in accordance with the setting of the unlock set register 118.
    • 一种DMA控制装置和数据传输方法,其可以独立于处理器的操作模式使用DMA通道,并且在DMA操作期间(在数据传输期间)实现对DMA控制参数的保护,同时减少 提供了尽可能小的处理器的操作模式的移动。 在通过在安全模式下锁定对ch-0 DMA控制寄存器114的访问来请求DMA开始时,CPU 101指示解锁设置寄存器118在传送完成时释放访问锁定。 然后,当参数控制电路119从ch-0状态管理电路116接收到传送完成的通知时,该参数控制电路根据解锁设定寄存器118的设定指示锁定设定寄存器115释放锁定。
    • 6. 发明授权
    • Bus system and a master device that stabilizes bus electric potential during non-access periods
    • 总线系统和主设备,可在非访问期间稳定总线电位
    • US06477606B1
    • 2002-11-05
    • US09378548
    • 1999-08-20
    • Osamu KawamuraTomohiko KitamuraTsutomu Sekibe
    • Osamu KawamuraTomohiko KitamuraTsutomu Sekibe
    • G06F1314
    • G06F13/423Y02D10/14Y02D10/151
    • A master device in a system including a bidirectional bus and at least one device manages whether the system is in an access state in which the master device permits an access to or from one device or a non-access state in which the master device permits an access to none of the devices. The master device drives the bidirectional bus using a predetermined current to transfer data to or from one device connected to the bidirectional bus when the system is in the access state. When the state of the system changes from the access state to the non-access state, the master device drives the bidirectional bus in order to stabilize the potential of the bidirectional bus to keep the bus potential from changing when the system is in a non-access state, thereby eliminating the need for conventional pull-up/pull-down resistors for stabilizing the bus potential during a non-access state.
    • 包括双向总线和至少一个设备的系统中的主设备管理系统是否处于主设备允许接入或来自一个设备的接入状态或主设备允许的非接入状态 无法访问任何设备。 当系统处于访问状态时,主设备使用预定的电流来驱动双向总线,以将数据传送到连接到双向总线的一个设备。 当系统的状态从访问状态变为非访问状态时,主设备驱动双向总线,以便稳定双向总线的电位,以便在系统处于非接入状态时保持总线电位不变, 从而消除了在非访问状态期间稳定总线电位的常规上拉/下拉电阻的需要。
    • 8. 发明授权
    • System integrated circuit
    • 系统集成电路
    • US06804742B1
    • 2004-10-12
    • US09711432
    • 2000-11-13
    • Tomohiko KitamuraMasataka OsakaTsutomu Sekibe
    • Tomohiko KitamuraMasataka OsakaTsutomu Sekibe
    • G06F1336
    • G06F11/366G06F11/364G06F11/3648
    • A system integrated circuit that identifies the cause of a malfunction even if the number of output terminals of a system LSI to be assigned to internal buses in the system LSI is strictly restricted. Comparators 11 to 15 are connected to any of a plurality of buses. Each comparator judges whether a certain expected value matches data transferred on a bus connected to the comparator. The selector unit 10 selects one of the plurality of buses in accordance with the judgement result of the comparator, and outputs data transferred on the selected bus to outside the system integrated circuit so that an observer can observe internal state of the system integrated circuit from outside.
    • 即使系统LSI中分配给内部总线的系统LSI的输出端子数量受到严格限制,也能够识别故障原因的系统集成电路。 比较器11至15连接到多个总线中的任一个。 每个比较器判断某个预期值是否匹配与连接到比较器的总线上传输的数据。 选择器单元10根据比较器的判断结果选择多个总线中的一个,并将在所选择的总线上传送的数据输出到系统集成电路外部,使得观察者可以从外部观察系统集成电路的内部状态 。