Nope. 480i consists of two images, each stored in the frame as 240 lines in height. The 240-line image you get from each field is expanded into full-height 480p frames by deinterlacing.

If you want 240-line fields from 480i frames, use SeparateFields() in Avisynth. Or use BobDoubler/AlternateFields in Virtualdub. A 720x480i video will be split into 720x240p half-height fields.

I don't know that frames smaller than 240 pixel height accept interlacing in any standard delivery format. 320x240i interlaced would be one really oddball video format with 4:3 320x120 fields.

double post.

Deinterlacing doesn't require woven frames. In this case, the deinterlacer just needs to know that it's received separated fields and then it adds a line in between each existing line by some method of interpolation.

No. What you're describing is 480p30, not 240p60.

480p30 sent as 480i has 2 fields from the same time, alternating spatially 1/60 of a second.
240p60 has 2 frames from different times, occupying the same spatial position, refreshed with a new complete image 1/60 s. (This way the image doesn't twitter up-and-down the way it would if the frames were drawn as fields.)

Sorry folks for the confusion regarding my 480i vs 240p statement - I mustn't have had my coffee that day :)