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    • 4. 发明授权
    • Disk player having a system configuration for determining the diameter
of loaded disks
    • 具有用于确定加载的盘的直径的系统配置的磁盘播放器
    • US5508987A
    • 1996-04-16
    • US286401
    • 1994-08-05
    • Masanori MatsunagaKouichi TakenoTakehiro Kataoka
    • Masanori MatsunagaKouichi TakenoTakehiro Kataoka
    • G11B19/12G11B19/22G11B27/10G11B27/36
    • G11B19/12G11B19/22G11B27/10
    • An object of this invention is to provide a disk player in which a plurality of disks different in diameter are driven, and can be identified with high accuracy. Disclosed is the disk player, a digital signal processing section applies to a CPU a synchronization signal which is raised to high level when the frequency of a detection signal outputted by a laser pickup reaches a predetermined value which permits a data reading operation, and a sense signal which is raised to high level when the frequency of the detection signal is shifted from a predetermined frequency. The CPU operates to rotate a spindle motor, and to brake the latter when the synchronization signal is raised to high level. The CPU further operates to detect a period of time which lapses from the time instant the motor is braked until the sense signal is fallen to low level, and to identify the loaded disk from the period of time thus detected.
    • 本发明的目的是提供一种盘驱动器,其中驱动直径不同的多个盘,并且可以高精度地识别。 公开了一种盘播放器,当数字信号处理部分向CPU提供当激光拾取器输出的检测信号的频率达到允许数据读取操作的预定值时升高到高电平的同步信号,以及感测 当检测信号的频率从预定频率偏移时升高到高电平的信号。 CPU操作以使主轴电动机旋转,并且当同步信号升高到高电平时对其进行制动。 CPU进一步操作以检测从电动机制动的时刻到感测信号下降到低电平之间的时间段,并且从所检测的时间段识别加载的磁盘。
    • 7. 发明授权
    • Method and apparatus for updating firmware
    • 更新固件的方法和装置
    • US06357021B1
    • 2002-03-12
    • US09291800
    • 1999-04-14
    • Masayuki KitagawaKoji TsuboiMasanori Matsunaga
    • Masayuki KitagawaKoji TsuboiMasanori Matsunaga
    • G06F1136
    • G06F8/65G06F11/1004G06F11/1433
    • A peripheral device and method are provided for reliably updating and checking firmware or other coded information stored within a nonvolatile memory of the device. The device comprises a microcontroller and a memory with a fixed part and an updateable part. Both the fixed part and the updateable part store firmware. When firmware in the updateable part is updated (such as by using a USB connection with a host PC), a first error detection code is generated and stored in the updateable part. As part of an initialization procedure, the firmware stored in the fixed part generates a second error detection code based on the updated firmware stored in the updateable part and compares the second error detection code to the first error detection code stored in the updateable part. If the error detection codes indicate that the firmware stored in the updateable part is valid, the microcontroller uses the firmware stored in the updateable part to operate the device; otherwise, the microcontroller uses firmware stored in the fixed part to operate the device.
    • 提供了用于可靠地更新和检查存储在设备的非易失性存储器内的固件或其他编码信息的外围设备和方法。 该装置包括微控制器和具有固定部分和可更新部分的存储器。 固定部分和可更新部分都存储固件。 当可更新部分中的固件更新(例如通过使用与主机PC的USB连接)时,将生成第一个错误检测代码并将其存储在可更新部分中。 作为初始化过程的一部分,存储在固定部分中的固件基于存储在可更新部分中的更新的固件生成第二错误检测码,并将第二错误检测码与存储在可更新部分中的第一错误检测码进行比较。 如果错误检测码指示存储在可更新部分中的固件有效,则微控制器使用存储在可更新部分中的固件来操作设备; 否则,微控制器使用存储在固定部分中的固件来操作设备。