FIGnition FUZE Hardware Reference Manual page 20

SRAM Buffering. A consequence of using a tiled video image format is that it must be
read in and converted to scan lines for the TV and this means 16 scans of SRAM must be
buffered in internal RAM. That's because the end of the first scan line in a row of tiles will
require reading in the last tile in the row, so all the tiles must be read in first. Similarly, the
generating the last scan line in a row of tiles requires all the tiles in the row to be kept in
internal RAM and therefore the next row of tiles will need to be read into internal RAM
ready for the following scan [Fig 3.10].
Fig 3.8
Fig 3.9
Fig 3.10