Patent Number: 
Section: claims

1. An electron beam lithography apparatus comprising:a first setting unit configured to set a drawing position on a semiconductor substrate based on layout information of the semiconductor substrate;a second setting unit configured to set a valid range on the semiconductor substrate based on shape information of the semiconductor substrate;a determination unit configured to determine whether or not the drawing position falls within the valid range; andan irradiation unit configured to irradiate the semiconductor substrate with an electron beam when the determination unit determines that the drawing position falls within the valid range. 2. The apparatus according to claim 1, wherein the layout information includes information of chip positions, frame positions, and stripe positions. 3. The apparatus according to claim 2, wherein the first setting unit adds the chip position, the frame position, and a main-deflection position to calculate the drawing position. 4. The apparatus according to claim 1, which further comprises:a correction unit configured to correct an irradiation position by the irradiation unit. 5. The apparatus according to claim 4, wherein the determination unit appends a control flag that instructs to turn off a beam to the correction unit when it is determined that the drawing position falls outside the valid range. 6. The apparatus according to claim 4, wherein the correction unit and the determination unit are included in one circuit. 7. The apparatus according to claim 1, wherein the drawing position set by the first setting unit is a drawing position in a sub deflection region. 8. The apparatus according to claim 1, wherein the shape information of the semiconductor substrate is generated based on intersections between a valid range of the semiconductor substrate in a chip layout on the semiconductor substrate and positions of the respective stripes in one axis direction. 9. The apparatus according to claim 1, wherein the first setting unit, the second setting unit, and the determination unit are configured using a DSP. 10. An electron beam lithography method comprising:setting a drawing position on a semiconductor substrate based on layout information of the semiconductor substrate;setting a valid range on the semiconductor substrate based on shape information of the semiconductor substrate;determining whether or not the drawing position falls within the valid range; andirradiating the semiconductor substrate with an electron beam when it is determined that the drawing position falls within the valid range. 11. The method according to claim 10, wherein the layout information includes information of chip positions, frame positions, and stripe positions. 12. The method according to claim 11, wherein the set drawing position is calculated by adding the chip position, the frame position, and a main deflection position. 13. The method according to claim 10, which further comprises:correcting an irradiation position of the electron beam. 14. The method according to claim 13, which further comprises:outputting an instruction to turn off a beam when it is determined that the drawing position falls outside the valid range. 15. The method according to claim 10, wherein the set drawing position is a drawing position in a sub deflection region. 16. The method according to claim 10, wherein the shape information of the semiconductor substrate is generated based on intersections between a valid range of the semiconductor substrate in a chip layout on the semiconductor substrate and positions of the respective stripes in one axis direction. 17. An electron beam lithography program which is stored in a storage medium readable by a computer, the program making the computer:set a drawing position on a semiconductor substrate based on layout information of the semiconductor substrate;set a valid range on the semiconductor substrate based on shape information of the semiconductor substrate;determine whether or not the drawing position falls within the valid range; andirradiate the semiconductor substrate with an electron beam when it is determined that the drawing position falls within the valid range. 18. A manufacturing method of a semiconductor device which manufactures a semiconductor device by use of a semiconductor substrate on which a lithography process is performed, the lithography process comprising:setting a drawing position on a semiconductor substrate based on layout information of the semiconductor substrate;setting a valid range on the semiconductor substrate based on shape information of the semiconductor substrate;determining whether or not the drawing position falls within the valid range; andirradiating the semiconductor substrate with an electron beam when it is determined that the drawing position falls within the valid range. 19. The method according to claim 18, wherein the layout information includes information of chip positions, frame positions, and stripe positions. 20. The method according to claim 18, wherein the shape information of the semiconductor substrate is generated based on intersections between a valid range of the semiconductor substrate in a chip layout on the semiconductor substrate and positions of the respective stripes in one axis direction.