Print engine/controller with printhead interface
    53.
    发明申请
    Print engine/controller with printhead interface 失效
    打印带有打印头接口的引擎/控制器

    公开(公告)号:US20040095609A1

    公开(公告)日:2004-05-20

    申请号:US10713091

    申请日:2003-11-17

    摘要: A print engine/controller (10) configured to be coupled with others to drive an ink drop printhead (33). It has an interface (27) at which to receive compressed page data. Image decoders (28, 88) decode compressed image planes image decoders to perform an expansion, in pipeline fashion, for the received compressed page data. A half-toner/compositer (29) composites respective strips of the decoded image planes and sends output to a printhead interface (32). A printhead interface (32) interfaces with the printhead. A synchronization signal generator (89, 90) may output a synchronization signal that is used to synchronize print engine/controllers. One printhead interface (32) preferably acts as master generating the synchronization signal to synchronize all the print engine/controllers to drive the printhead at any one or more of higher speed, higher input resolution, higher outlet resolution or wider format. The printhead interface comprises two LineSyncGen units, a first LineSyncGen unit providing a synchronization signal for multiple print engine/controller chips and a second LineSyncGen unit adapted to pulse a paper drive stepping motor.

    摘要翻译: 打印引擎/控制器(10),被配置为与其他装置相连以驱动墨滴打印头(33)。 它具有用于接收压缩页面数据的接口(27)。 图像解码器(28,88)解码压缩图像平面图像解码器,以流水线方式对接收到的压缩页面数据进行扩展。 半色调/合成器(29)复合各个解码图像平面的条,并将输出发送到打印头接口(32)。 打印头接口(32)与打印头接口。 同步信号发生器(89,90)可以输出用于同步打印引擎/控制器的同步信号。 优选地,一个打印头接口(32)充当主产生同步信号以同步所有打印引擎/控制器以以更高速度,更高输入分辨率,更高出口分辨率或更宽格式的任何一个或多个来驱动打印头。 打印头接口包括两个LineSyncGen单元,第一LineSyncGen单元为多个打印引擎/控制器芯片提供同步信号,以及第二LineSyncGen单元,适用于脉冲纸驱动步进电机。

    Validating untrusted objects and entities
    56.
    发明申请
    Validating untrusted objects and entities 失效
    验证不受信任的对象和实体

    公开(公告)号:US20040049678A1

    公开(公告)日:2004-03-11

    申请号:US10636283

    申请日:2003-08-08

    IPC分类号: H04L009/00

    摘要: This invention is a validation method for determining whether an untrusted chip is valid, or not. In another aspect it concerns a validation system for the method. The method may be used to determine the physical presence of a valid chip. A trusted chip generates a random number and a digital signature for it, encrypts them with a first key and then calls a prove function in the untrusted chip. The prove function decrypts the random number and signature, and calculates another signature from the decrypted random number, for comparison with the decrypted one. If the comparison is successful the random number is encrypted with another key and sent back as a second number. Finally, a test function is called in the trusted chip to generate its own encrypted version of the random number using the second key and then compare it with the received version to validate the untrusted chip. The untrusted chip may be associated with a consumable so that validation of the untrusted chip authenticates the consumable.

    摘要翻译: 本发明是用于确定不可信芯片是否有效的验证方法。 另一方面,它涉及该方法的验证系统。 该方法可用于确定有效芯片的物理存在。 可信芯片为其生成随机数和数字签名,用第一个密钥对其进行加密,然后在不可信芯片中调用证明功能。 证明函数解密随机数和签名,并从解密的随机数中计算另一个签名,以便与解密的随机数进行比较。 如果比较成功,则使用另一个密钥对随机数进行加密,并作为第二个数字返回。 最后,在可信芯片中调用测试功能,使用第二个密钥生成自己的加密版本的随机数,然后将其与接收的版本进行比较,以验证不可信芯片。 不可信芯片可以与消耗品相关联,使得不可信芯片的验证对消耗品进行认证。