专利名称：Map drawing device and map data display
control method
发明人：Yasuhiro Koido申请号：US12632227申请日：20091207公开号：US08437955B2公开日：20130507
专利附图：
摘要：A map drawing device can reduce the use amount of a video memory and powerconsumption. The map drawing device comprises an arithmetic processing unit thatoperates according to a map drawing program and outputs an address of map data to be
drawn; an address difference detection circuit that makes comparison of each address ofmap data output one by one from the arithmetic processing unit and determines whetheror not to output a transfer start trigger signal to a data transfer control unit; and a datatransfer control unit that directly transfers the map data with the address instructed bythe arithmetic processing unit from a map data storage medium to the video memorybased on the transfer start trigger signal output from the address difference detectioncircuit.
申请人：Yasuhiro Koido
地址：Yokohama JP
国籍：JP
代理机构：Sughrue Mion, PLLC
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