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• Densely_packed_decimal abstract "Densely packed decimal (DPD) is an efficient method for binary encoding decimal digits.The traditional system of binary encoding for decimal digits, known as binary-coded decimal (BCD), uses four bits to encode each digit, resulting in significant wastage of binary data bandwidth (since four bits can store 16 states and are being used to store only 10). Densely packed decimal is a more efficient code that packs three digits into ten bits using a scheme that allows compression from, or expansion to, BCD with only two or three gate delays in hardware.The densely packed decimal encoding is a refinement of Chen–Ho encoding; it gives the same compression and speed advantages, but the particular arrangement of bits used confers additional advantages: Compression of one or two digits (into the optimal four or seven bits respectively) is achieved as a subset of the three-digit encoding. This means that arbitrary numbers of decimal digits (not just multiples of three digits) can be encoded efficiently. For example, 38=12×3+2 decimal digits can be encoded in 12×10+7=127 bits – that is, 12 sets of three decimal digits can be encoded using 12 sets of ten binary bits and the remaining two decimal digits can be encoded using a further seven binary bits. The subset encoding mentioned above is simply the rightmost bits of the standard three-digit encoding; the encoded value can be widened simply by adding leading 0 bits. All seven-bit BCD numbers (0 through 79) are encoded identically by DPD. This makes conversions of common small numbers trivial. (This must break down at 80, because that requires eight bits for BCD, but the above property requires that the DPD encoding must fit into seven bits.) The low-order bit of each digit is copied unmodified. Thus, the non-trivial portion of the encoding can be considered a conversion from three base-5 digits to seven binary bits. Further, digit-wise logical values (in which each digit is either 0 or 1) can be manipulated directly without any encoding or decoding being necessary.↑".
• Densely_packed_decimal wikiPageExternalLink dense.
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• Densely_packed_decimal wikiPageID "4036694".
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• Densely_packed_decimal wikiPageWikiLink Binary-coded_decimal.
• Densely_packed_decimal wikiPageWikiLink Binary_number.
• Densely_packed_decimal wikiPageWikiLink Category:Binary_arithmetic.
• Densely_packed_decimal wikiPageWikiLink Chen–Ho_encoding.
• Densely_packed_decimal wikiPageWikiLink Decimal.
• Densely_packed_decimal wikiPageWikiLink Decimal128_floating-point_format.
• Densely_packed_decimal wikiPageWikiLink Decimal32_floating-point_format.
• Densely_packed_decimal wikiPageWikiLink Decimal64_floating-point_format.
• Densely_packed_decimal wikiPageWikiLink Floating_point.
• Densely_packed_decimal wikiPageWikiLink IEEE_floating_point.
• Densely_packed_decimal wikiPageWikiLink Irving_T._Ho.
• Densely_packed_decimal wikiPageWikiLink Mike_Cowlishaw.
• Densely_packed_decimal wikiPageWikiLink Prefix_code.
• Densely_packed_decimal wikiPageWikiLink Tien_Chi_Chen.
• Densely_packed_decimal wikiPageWikiLink Truth_value.
• Densely_packed_decimal wikiPageWikiLinkText "DPD".
• Densely_packed_decimal wikiPageWikiLinkText "Densely packed decimal".
• Densely_packed_decimal wikiPageWikiLinkText "densely packed decimal".
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• Densely_packed_decimal wikiPageUsesTemplate Template:Densely_packed_decimal.
• Densely_packed_decimal wikiPageUsesTemplate Template:Reflist.
• Densely_packed_decimal subject Category:Binary_arithmetic.
• Densely_packed_decimal hypernym Method.
• Densely_packed_decimal type Software.
• Densely_packed_decimal type Redirect.
• Densely_packed_decimal comment "Densely packed decimal (DPD) is an efficient method for binary encoding decimal digits.The traditional system of binary encoding for decimal digits, known as binary-coded decimal (BCD), uses four bits to encode each digit, resulting in significant wastage of binary data bandwidth (since four bits can store 16 states and are being used to store only 10).".
• Densely_packed_decimal label "Densely packed decimal".
• Densely_packed_decimal sameAs Q5259312.
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• Densely_packed_decimal sameAs m.0bdsgb.
• Densely_packed_decimal sameAs Q5259312.
• Densely_packed_decimal wasDerivedFrom Densely_packed_decimal?oldid=704020171.
• Densely_packed_decimal isPrimaryTopicOf Densely_packed_decimal.