% vim:ts=2 sw=2:
\begin{tikzpicture}[
		brace/.style = {
			decorate,
			decoration = {
				calligraphic brace,
				amplitude = 3mm,
				raise = 1mm,
				mirror,
			},
			very thick,
			pen colour = {black} 
		},
	]
	\matrix[
		column sep = -1pt,
		nodes = {
			draw, rectangle, very thick,
			minimum height = 12mm,
			text width = 20mm,
			align = center,
		},
	]{
		\node[] {Preamble \\ \(k\) Bytes}; &
		\node[fill=lightgray!20] (pad) {Padding \\ 1 Bit}; &
		\node[fill=red!10] (id) {ID \\ 5 Bits}; &
		\node[fill=red!10] {Length \\ 21 Bits}; &
		\node[fill=red!10] (par) {Parity \\ 5 Bits}; &
		\node[] {Payload \\ \(\ell\) Bytes}; \\
		% \node{Padding }; \\
	};

	\draw[brace] (id.south west) --
		node[midway, below = 5mm] {(31, 26) Hamming ECC}
		(par.south east);

	% \draw[brace] (par.north east) --
	% 	node[midway, above = 5mm] {4 Bytes}
	% 	(pad.north west);

\end{tikzpicture}