Patent ID: 8188449

Claim:
A charged particle beam drawing apparatus, comprising: a drawing portion for drawing patterns corresponding to figures included in cells included in a drawing data which has at least figure hierarchy and cell hierarchy, in a drawing area on a workpiece by a charged particle beam; an input buffer, wherein the drawing data inputted to the charged particle beam drawing apparatus and corresponding to all of the drawing area on the workpiece is stored to the input buffer; a dividing portion for dividing the drawing area on the workpiece into rectangular stripe frames and dividing the rectangular stripe frames into block frames; a virtual block frame forming portion for combining at least a first block frame and a second block frame into a virtual block frame, wherein the first block frame and the second block frame are a part of the block frames in one of the stripe frames, and wherein the first block frame is adjacent to the second block frame; an output buffer of an input data dividing module, wherein a data corresponding to the virtual block frame is read from the input buffer and is stored to the output buffer of the input data dividing module, and wherein the data corresponding to the virtual block frame is a part of the drawing data corresponding to all of the drawing area on the workpiece; a transferring portion for transferring the data corresponding to the virtual block frame from the output buffer of the input data dividing module to a common memory; a first converter for converting a data of a first figure into a first drawing apparatus internal format data, wherein the first figure is included in a cell extending over the first block frame and the second block frame, and is included in the first block frame, and wherein the data of the first figure is a part of the data corresponding to the virtual block frame transferred to the common memory; and a second converter for converting a data of a second figure into a second drawing apparatus internal format data in parallel with the first converter, wherein the second figure is included in the cell extending over the first block frame and the second block frame, and is included in the second block frame, and wherein the data of the second figure is a part of the data corresponding to the virtual block frame transferred to the common memory of the first converter corresponding to the first block frame and the second converter corresponding to the second block frame.