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The bottom 5 bits contain the number of bytes remaining in the FIFO which is trivial to implement with Fifo8 (the remaining bits are unimplemented and left as 0 for now). Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Reviewed-by: Laurent Vivier <laurent@vivier.eu> Message-Id: <20210304221103.6369-41-mark.cave-ayland@ilande.co.uk>