| 摘要 |
A plug-in unit, usable for digital video/audio compression, is composed of integrated circuit devices 102, 103, 104 and is connected via a parallel port interface 117, 118 to a host computer 124 so that the device 103 can access memory in the host as if the memory were directly connected to the device. A test interface, such as the IEEE 1149.1 boundary-scan port, is used to find out the state of the address pins of device 103, whereby external connections to these pins are unnecessary. Data compression (details are given) is performed partly in the unit and partly in the host computer. The unit is software-(re)configurable whilst in operation.
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