参数资料
型号: PC87393F-VJG
厂商: NATIONAL SEMICONDUCTOR CORP
元件分类: 外设及接口
英文描述: 100-Pin LPC SuperI/O Devices for Portable Applications
中文描述: MULTIFUNCTION PERIPHERAL, PQFP100
封装: TQFP-100
文件页数: 109/148页
文件大小: 1733K
代理商: PC87393F-VJG
2.0 Device Architecture and Configuration (Continued)
63
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Usage Hints: To operate GMP enhanced features, make sure to locate its base address within the LPC Wide Generic ad-
dress range.
When bit 3 of the GMP configuration register is set to 0 (default), the GMP operates in Legacy mode. In this mode, only the
Game Port Legacy Status (GMPLST) register of the GMP is accessible, and is mapped to the base address of the GMP.
For example, if GMP configuration bit 3 is set to 0 and the base address is programmed to 203h, the GMPLST register is
mapped to address 203h, and is the only user-accessible GMP register.
The GMP is also forced to operate in Legacy mode if the programmed base address is not 16-byte aligned; i.e. bits 3-0 of
the base address are not all 0’s.
When bit 3 of the GMP register is set to 1 and the programmed GMP base address is 16-byte aligned; i.e., bits 3-0 of the
base address are all 0’s, the GMP can be operated in Enhanced mode. In this condtion, all the registers listed in the GMP
chapter are accessible.
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