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bq40z50-R3 HMAC SHA-1 Authentication question

Other Parts Discussed in Thread: BQ26100, BQ40Z50

Generate SHA-1 input block B2 of 512 bits(total input = 128-bit authentication key KD + 160-bit hash HMAC1 +1 +159  0s + 100100000).

what's "+1 +159  0s + 100100000" mean?     I can't understand the above formula how to get a 512-bit message.