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TLC5949: Datasheet is unclear on how to set the grayscale values

Part Number: TLC5949

Hi, I'm confused by some of the information in the TLC5949 datasheet, specifically on page 27 where the common shift register is referred to as 193 bits long but then the 'low 256 bits' of the common shift register are referenced. Is the 256 a typo?

Also, in the diagram below, the total number of bits seems to be 16 (OUT0 .. OUT15) multiplied by 16 (Bit 0 .. Bit 15) which would indeed add up to 256 rather than 192.

The rest of the datasheet seems to imply that the # of bits is indeed 192, but I'm getting strange results when I try to set the grayscale values. Can someone from TI clarify please?