JPH02126317A - Data format converting system - Google Patents

Data format converting system

Info

Publication number
JPH02126317A
JPH02126317A JP63279931A JP27993188A JPH02126317A JP H02126317 A JPH02126317 A JP H02126317A JP 63279931 A JP63279931 A JP 63279931A JP 27993188 A JP27993188 A JP 27993188A JP H02126317 A JPH02126317 A JP H02126317A
Authority
JP
Japan
Prior art keywords
value
data
prescribed
digits
mantissa
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP63279931A
Other languages
Japanese (ja)
Inventor
Toshitaka Shirasaka
白坂 俊孝
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Fuji Facom Corp
Original Assignee
Fujitsu Ltd
Fuji Facom Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujitsu Ltd, Fuji Facom Corp filed Critical Fujitsu Ltd
Priority to JP63279931A priority Critical patent/JPH02126317A/en
Publication of JPH02126317A publication Critical patent/JPH02126317A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To attain the high speed conversion of floating point form data to prescribed fixed point format data by shifting the bits of only the number of shifts with a mantissa part as an index part and with the number of cut-off digits as the number of shifts by fixed point format data. CONSTITUTION:An adding means 1 prepares a sum 6 with a value 5 to invert the value of an index part 4 and respective digits of the binary expression of the number of the digits of the prescribed digits or below and obtains the value related to the number of shifts. A selecting means 2 identifies the value of the sum 6, and at the time of being the size in the prescribed range, the value composed of the bit column of the prescribed digit or below of the sum 6 is outputted as the number 7 of controls. At the time of being smaller than the prescribed range, the prescribed value to obtain the result of the underflow is outputted as the number 7 of controls and at the time of being larger than the range, the prescribed value to obtain the result of the overflow is outputted as the number 7 of controls respectively. A memory 3 has respective storing positions corresponding to the number 7 of the controls concerning all respective values capable of obtaining by a mantissa part 8. By the address specified by the mantissa part 8 and the number 7 of the controls, the necessary data format converting result 9 is held at the storing position read from the memory 3.

Description

【発明の詳細な説明】 〔概 要〕 データ処理における、浮動小数点形式データから固定小
数点形式データへの変換方式に関し、浮動小数点形式デ
ータを所定の固定小数点形式データへ高速に変換できる
、経済的なデータ形式変換方式を目的とし、 仮数部と指数部(4)からなる浮動小数点形式データを
、所定桁以下を切り捨てた固定小数点形式にするデータ
形式変換において、該指数部の値と該所定桁以下の桁数
の2進数表現の各桁を反転した値との和を生成する加算
手段と、該和の大きさが、所定の範囲内の場合は該和の
所定桁以下のビット列からなる値、該範囲より小さい場
合は所定値、該範囲より大きい場合は別の所定値を、そ
れぞれ制御数とする選択手段と、該仮数部のとり得るす
べての各値について、該制御数に対応する各記憶位置を
有するメモリとを設け、該仮数部と該制御数とによって
定まるアドレスによって該メモリから読み出すデータを
、該仮数部と該制御数に該当する該浮動小数点形式デー
タの該形式変換結果とするように構成する。
[Detailed Description of the Invention] [Summary] Regarding a conversion method from floating point format data to fixed point format data in data processing, an economical method that can convert floating point format data to predetermined fixed point format data at high speed is provided. For the purpose of data format conversion method, in data format conversion from floating point format data consisting of a mantissa and exponent part (4) to a fixed point format with truncated below a predetermined digit, the value of the exponent part and the below predetermined digit are calculated. an addition means for generating a sum with a value obtained by inverting each digit of a binary representation of the number of digits, and when the size of the sum is within a predetermined range, a value consisting of a bit string of a predetermined digit or less of the sum; a selection means for setting a predetermined value as a control number if it is smaller than the range, and another predetermined value if it is larger than the range; and each memory corresponding to the control number for each possible value of the mantissa. A memory having a location is provided, and data read from the memory at an address determined by the mantissa part and the control number is the format conversion result of the floating point format data corresponding to the mantissa part and the control number. Configure.

〔産業上の利用分野〕[Industrial application field]

本発明は、データ処理における浮動小数点形式データか
ら固定小数点形式データへの変換を行うためのデータ形
式変換方式に関する。
The present invention relates to a data format conversion method for converting floating point format data to fixed point format data in data processing.

〔従来の技術と発明が解決しようとする課題〕計算機に
よって数値を扱うデータ処理において、数値データとし
て入力された浮動小数点形式データを処理の都合から固
定小数点形式データに変換することがしばしばある。
[Prior Art and Problems to be Solved by the Invention] In data processing in which numerical values are handled by a computer, floating point format data input as numerical data is often converted to fixed point format data for convenience of processing.

ここで浮動小数点形式データとは公知のようにそれぞれ
所定のビット長を有する仮数部と指数部によって数値を
表現するようにしたデータであって、例えばその表現に
よって、 〔仮数部〕×〔2の〔指数部〕乗〕 の数値を表し、仮数部は絶対値を表す最下位ビットの右
或いは最上位ビットの左に小数点があり、指数部は整数
であるものと定義する。
Here, floating-point format data is data in which a numerical value is expressed by a mantissa part and an exponent part, each having a predetermined bit length, as is well known, and for example, by the expression, [mantissa part] [Exponent part] power] It is defined that the mantissa part has a decimal point to the right of the least significant bit or to the left of the most significant bit representing the absolute value, and the exponent part is an integer.

他方、固定小数点形式データとは、公知のように所定の
ビット長で整数(即ち、最下位ビットの右に小数点があ
る数)を表すようにしたデータである。なおこの表現は
、例えば整数の下位の一定桁数を切り捨てた表現形式、
即ち、 〔データの表す整数〕×〔2の一定数乗〕を表すものと
して扱うこともできる。
On the other hand, fixed-point format data, as is well known, is data that represents an integer (that is, a number with a decimal point to the right of the least significant bit) using a predetermined bit length. Note that this expression is, for example, a representation format in which a certain number of lower digits of an integer are truncated,
That is, it can also be treated as representing [an integer represented by data]×[2 to the power of a fixed number].

前記のようにデータの形式を浮動小数点形式から固定小
数点形式に変換する場合には、前記のような浮動小数点
形式の指数部の表す値で定まるビット数だけ仮数部を左
又は右にシフトすることにより、小数点の位置が所要の
固定位置に来るようにする処理を実行することにより固
定小数点形式データを得るが、この処理はデータから指
数部を取り出し、指数部からシフト量と方向を決定して
仮数部をシフトし、その結果オーバーフローした場合に
は、それを検出して所要の処置をする等の処理を要する
ので比較的実行時間の長い処理となる。
When converting the data format from floating point format to fixed point format as described above, shift the mantissa part to the left or right by the number of bits determined by the value represented by the exponent part of the floating point format as described above. Fixed-point format data is obtained by executing processing to bring the decimal point to the required fixed position, but this processing extracts the exponent part from the data and determines the shift amount and direction from the exponent part. If the mantissa is shifted and an overflow occurs as a result, processing such as detecting it and taking necessary measures is required, resulting in processing that takes a relatively long time to execute.

このために、リアルタイム処理で採取される浮動小数点
形式データを、固定小数点形式データにリアルタイムで
変換して画像処理の入力データにする場合等、特に高速
性を要求される場合のために、経済的にその要求を満足
する方式が望まれている。
For this reason, we have developed an economical method for cases where high speed is required, such as when converting floating-point format data collected in real-time processing into fixed-point format data in real time and using it as input data for image processing. A system that satisfies these requirements is desired.

本発明は、浮動小数点形式データを所定の固定小数点形
式データへ高速に変換できる、経済的なデータ形式変換
方式を目的とする。
An object of the present invention is to provide an economical data format conversion method that can convert floating point format data into predetermined fixed point format data at high speed.

〔課題を解決するための手段〕[Means to solve the problem]

第1図は、本発明の構成を示すブロック図である。 FIG. 1 is a block diagram showing the configuration of the present invention.

図は浮動小数点形式データを所定の固定小数点形式デー
タに変換するためのデータ形式変換方式の構成を示し、
lは浮動小数点形式データの指数部人力4と所定桁数の
2進表現の反転値5との和を出力する加算手段、2は加
算手段1の出力する和6から制御数7を生成する選択手
段、3は浮動小数点形式データの仮数部8と選択手段2
の出力する制御数7とをアドレス入力として、データ形
式変換結果のデータ9を読み出すようにしたメモリであ
る。
The figure shows the configuration of a data format conversion method for converting floating point format data to predetermined fixed point format data.
1 is an addition means that outputs the sum of the exponent part 4 of the floating point format data and the inverted value 5 of the binary representation of a predetermined number of digits, and 2 is a selection that generates the control number 7 from the sum 6 output by the addition means 1. 3 is a mantissa part 8 of floating point format data and a selection means 2
This memory is configured to read out data 9 as a result of data format conversion by using the control number 7 outputted by the controller as an address input.

〔作 用〕[For production]

仮数部noビット、指数部ncビットの浮動小数点形式
データを、noビットで表される桁数の下位桁(以下に
おいて切り捨て桁数という)を切り捨てた固定小数点形
式のn0ビツトのデータに変換する場合に、仮数部の小
数点は最下位ビットの右にあるものとして、固定小数点
形式データは仮数部を「指数部−切り捨て桁数」をシフ
ト数として、シフト数だけのビットをシフト(但しシフ
ト数が正なら左シフト、負なら右シフト)することによ
り得られる。
When converting floating point format data with no bits in the mantissa and nc bits in the exponent to data in fixed point format with n0 bits in which the lower digits of the number of digits represented by the no bits (hereinafter referred to as the number of truncated digits) are truncated. Assuming that the decimal point of the mantissa is to the right of the least significant bit, for fixed-point format data, the mantissa is shifted by the number of bits equal to the number of shifts, with the number of shifts equal to "exponent part - number of digits to be truncated" (however, if the number of shifts is If it is positive, shift it to the left; if it is negative, shift it to the right).

この場合にシフトビット数がn0以上であれば、左シフ
トの場合は仮数部のビットパターン如何に関わらず無条
件にオーバフローして、正しい結果を得ることができず
、又右シフトの場合には無条件にアンダフローして結果
は0になるので、シフト数が−(no −1) 〜+ 
(no−1)までの2n、、 −1個の範囲に限って、
個々の仮数部の値に応じて有効な数値を持つ結果を得る
可能性があり、この範囲より小さい場合は無条件に結果
を0、この範囲より大きい場合は結果が得られないこと
を示す表示を無条件にすればよい。本発明は、これに基
づいて結果を保持するメモリの所要量の減少を可能にす
る。
In this case, if the number of shift bits is n0 or more, in the case of a left shift, it will overflow unconditionally regardless of the bit pattern of the mantissa, and a correct result cannot be obtained, and in the case of a right shift, Since it will underflow unconditionally and the result will be 0, the number of shifts will be −(no −1) ~+
Only within the range of 2n,, -1 up to (no-1),
It is possible to obtain a result with a valid numerical value depending on the value of each mantissa, and if it is smaller than this range, the result is unconditionally 0, and if it is larger than this range, the result is not obtained. should be made unconditional. The invention allows for a reduction in the memory requirements for holding results on this basis.

そのために、先ず第1図の加算手段1で指数部4の値と
所定桁以下の桁数の2進数表現の各桁を反転した値5と
の和6を生成して、前記シフト数に関わる値を得、選択
手段2が和6の値を識別し、和6が所定の範囲内の大き
さである場合は前記の範囲内として和6の所定桁以下の
ビット列からなる値を制御数7として出力する。又、そ
の範囲より小さい場合は前記アンダフローの結果を得る
ための所定値、その範囲より大きい場合は前記オーバフ
ローの結果を得るための別の所定値を、それぞれ制御数
7として出力する。
To do this, first, the adding means 1 shown in FIG. 1 generates a sum 6 of the value of the exponent part 4 and the value 5 obtained by inverting each digit of the binary representation of the number of digits below a predetermined number, which is related to the shift number. The selection means 2 identifies the value of the sum 6, and if the sum 6 is within a predetermined range, the control number 7 selects a value consisting of a bit string of a predetermined digit or less of the sum 6 as being within the range. Output as . Further, if it is smaller than the range, a predetermined value for obtaining the underflow result is output, and if it is larger than the range, another predetermined value for obtaining the overflow result is output as the control number 7, respectively.

メモリ3は仮数部8のとり得るすべての各僅について制
御数7に対応する各記憶位置を有し、仮数部8と制御数
7とによって定まるアドレスによってメモリ3から読み
出す記憶位置に、所要のデータ形式変換結果を保持する
ように構成する。
The memory 3 has storage locations corresponding to the control number 7 for all possible fractions of the mantissa part 8, and the required data is stored in the storage location read from the memory 3 according to the address determined by the mantissa part 8 and the control number 7. Configure to retain format conversion results.

以上の処理方式により、仮数部のシフト動作の必要無く
メモリから直接に変換結果のデータを高速に得ることが
でき、且つこのために必要なメモリ容量を仮数部の各ビ
ットパターンごとに2no −1語近くに圧縮して経済
化することができる。
With the above processing method, it is possible to obtain conversion result data directly from memory at high speed without the need for a shift operation of the mantissa, and the memory capacity required for this can be reduced to 2no -1 for each bit pattern of the mantissa. It can be made economical by compressing it into words.

〔実施例〕〔Example〕

第2図はDINで示す7ビツトの仮数部と、GINでし
めず5ビツトの指数部からなる浮動小数点形式データを
、Glで示す5ビツトの切り捨て桁数だけ切り捨てた7
ビツトの固定小数点形式データに変換するためのデータ
形式変換方式の構成例を示すブロック図である。
Figure 2 shows floating point format data consisting of a 7-bit mantissa indicated by DIN and a 5-bit exponent not concluded by GIN, and is truncated by the number of 5-bit digits indicated by Gl.
FIG. 2 is a block diagram showing an example of a configuration of a data format conversion method for converting data into bit fixed-point format data.

先ず加算手段をなす加算器10に、GlNとG、の各ビ
ットを反転した値とを入力して加算を実行し5ビツトの
和11と1ビツトのキャリイ12からなる加算結果G 
Aooを得る。GADDは明らかにG、N−G* +(
2’−1)であので、シフト数となるG、N−GRとG
ADDとの関係は表のようになる。
First, GlN and the inverted value of each bit of G are inputted to the adder 10, which serves as an adding means, and the addition is performed, resulting in an addition result G consisting of a 5-bit sum 11 and a 1-bit carry 12.
Get Aoo. GADD is clearly G, NG* + (
2'-1), so G, N-GR and G are the shift numbers.
The relationship with ADD is shown in the table below.

表ニオイ”i’、GAIIE+ カラ(25−1) 即
チ2進11(表現で(11111)を減じたものがシフ
トすべきビット数であり、右又は左7ビツト以上のシフ
トはアンダフロー又はオーバフローを生じ、表の範囲よ
り外では更にシフト量が大きくなることは明らかで、有
効な変換結果を得るのは表における右又は左シフト6ビ
ツト以内の範囲になる。
Table odor "i', GAIIE + color (25-1) Sochi binary 11 (in expression, subtracting (11111) is the number of bits to be shifted, and shifting more than 7 bits to the right or left will result in underflow or overflow. It is clear that the shift amount becomes even larger outside the range of the table, and valid conversion results are obtained within the range of right or left shift of 6 bits in the table.

従ってシフト数6ビツト以内を検出すればよいが、後述
のメモリ構成のアドレス境界を考慮して、表に示す範囲
と、それより小さい場合及び大きい場合について制御数
を決定するようにする。
Therefore, it is sufficient to detect a shift number of 6 bits or less, but the control number is determined for the range shown in the table and for smaller and larger cases, taking into consideration the address boundaries of the memory configuration, which will be described later.

そのために識別回路13はセレクタ14と共に選択手段
を構成し、 GADD が表の範囲にあることを検 出して、 その出力によりセレクタ14を制御して制御数S。LI
? を決定する。
For this purpose, the identification circuit 13 constitutes a selection means together with the selector 14, detects that GADD is within the range shown in the table, and controls the selector 14 with its output to obtain the control number S. L.I.
? Determine.

表 即ち、 GADD が表の範囲内にある場合には、 識 別回路13の出力が1になり、セレクタ14のA側を選
択してG ADDの下位4ビツトをS。U、として出力
する。又GAD、が表の範囲外の場合には、識別回路1
3の出力が0になり、セレクタ14のB側を選択する。
That is, when GADD is within the range of the table, the output of the identification circuit 13 becomes 1, the A side of the selector 14 is selected, and the lower 4 bits of GADD are set to S. Output as U. Also, if GAD is outside the range shown in the table, the identification circuit 1
3 becomes 0, and the B side of the selector 14 is selected.

B側にはG Ag2Oの下位4ビツトの下位3ビツトを
キャリイビットにするように接続し、従って表の範囲よ
り小さい場合は2進表現(1000)、大きい場合は(
0111)をS。U、として出力することになる。
The lower 3 bits of the lower 4 bits of G Ag2O are connected to the B side as carry bits. Therefore, if the range is smaller than the range in the table, it is expressed in binary (1000), and if it is larger, it is expressed as (1000).
0111) to S. It will be output as U.

S outは仮数部DINの下位に連結して、メモリ1
5のアドレス入力とする。従って、仮数部の各ビットパ
ターンについて、その仮数部とS。ur ’c連結した
アドレスで読み出されるメモリ15の各語に、その仮数
部をS。LITO値に対応するシフト数に従ってシフト
した結果を予め記憶しておくことにより、メモリ15の
語を読み出すことにより固定小数点形式に変換したデー
タを得る。
S out is connected to the lower part of the mantissa part DIN and is stored in memory 1.
5 address input. Therefore, for each bit pattern of the mantissa, its mantissa and S. ur 'c Each word of the memory 15 read at the concatenated address has its mantissa part S. By storing in advance the result of shifting according to the number of shifts corresponding to the LITO value, data converted to fixed-point format is obtained by reading out a word in the memory 15.

その場合、アンダフローに対応する語には全ビットOを
記憶し、又オーバフローに対応する語は例えば全ビット
を1にして表示する。なお、シフト数が右又は左6ビツ
ト以内の場合でも、仮数部のビットパターンによっては
当然アンダフロー又はオーバフローを生じる場合があり
、そのような場合に該当する語にも前記のように全0又
は全1を記憶しておく。
In this case, the word corresponding to underflow is stored with all bits O, and the word corresponding to overflow is displayed with all bits set to 1, for example. Note that even if the number of shifts is within 6 bits to the right or left, underflow or overflow may occur depending on the bit pattern of the mantissa, and in such cases, the corresponding word may also have all 0s or 6 bits left. Memorize all 1.

〔発明の効果〕〔Effect of the invention〕

以上の説明から明らかなように本発明によれば、データ
処理における、浮動小数点形式データから固定小数点形
式データへの変換が、経済的な構成によって高速に処理
できるという著しい工業的効果がある。
As is clear from the above description, the present invention has a significant industrial effect in that conversion from floating point format data to fixed point format data in data processing can be processed at high speed with an economical configuration.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明の構成を示すブロック図、第2図は本発
明の実施例を示すブロック図である。 図において、 ■は加算手段、     2は選択手段、3.15はメ
モリ、    4は指数部、5は所定桁数の 6は和、 8は仮数部、 10は加算器、 14はセレクタ 2進表現の反転値、 7は制御数、 9はデータ、 13は識別回路、 3″′I ダ 本発明の構成を示すブロック図 第 図 本発明の実施例を示すブロック図 第 図
FIG. 1 is a block diagram showing the configuration of the present invention, and FIG. 2 is a block diagram showing an embodiment of the invention. In the figure, ■ is an addition means, 2 is a selection means, 3.15 is a memory, 4 is an exponent part, 5 is a predetermined number of digits, 6 is a sum, 8 is a mantissa part, 10 is an adder, 14 is a selector binary representation 7 is a control number, 9 is data, 13 is an identification circuit, 3'''Ida is a block diagram showing the configuration of the present invention.FIG. 7 is a block diagram showing an embodiment of the present invention.

Claims (1)

【特許請求の範囲】 仮数部(8)と指数部(4)からなる浮動小数点形式デ
ータを、所定桁以下を切り捨てた固定小数点形式にする
データ形式変換において、 該指数部(4)の値と該所定桁以下の桁数の2進数表現
の各桁を反転した値(5)との和(6)を生成する加算
手段(1)と、 該和(6)の大きさが、所定の範囲内の場合は該和の所
定桁以下のビット列からなる値、該範囲より小さい場合
は所定値、該範囲より大きい場合は別の所定値を、それ
ぞれ制御数(7)とする選択手段(2)と、 該仮数部(8)のとり得るすべての各値について、該制
御数(7)に対応する各記憶位置を有するメモリ(3)
とを設け、 該仮数部(8)と該制御数(7)とによって定まるアド
レスによって該メモリ(3)から読み出すデータ(9)
を、該仮数部と該制御数に該当する該浮動小数点形式デ
ータの該形式変換結果とするように構成されていること
を特徴とするデータ形式変換方式。
[Claims] In data format conversion from floating point format data consisting of a mantissa part (8) and an exponent part (4) to a fixed point format with truncated below a predetermined digit, the value of the exponent part (4) and an addition means (1) for generating a sum (6) with a value (5) obtained by inverting each digit of a binary representation of the number of digits equal to or less than the predetermined number of digits; Selection means (2) that sets a value consisting of a bit string of a predetermined digit or less of the sum if it is within the range, a predetermined value if it is smaller than the range, and another predetermined value if it is larger than the range, respectively, as the control number (7). and a memory (3) having each storage location corresponding to the control number (7) for each possible value of the mantissa (8).
and data (9) read from the memory (3) at an address determined by the mantissa part (8) and the control number (7).
A data format conversion method, characterized in that the data format conversion method is configured to make the format conversion result of the floating point format data corresponding to the mantissa part and the control number.
JP63279931A 1988-11-04 1988-11-04 Data format converting system Pending JPH02126317A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63279931A JPH02126317A (en) 1988-11-04 1988-11-04 Data format converting system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63279931A JPH02126317A (en) 1988-11-04 1988-11-04 Data format converting system

Publications (1)

Publication Number Publication Date
JPH02126317A true JPH02126317A (en) 1990-05-15

Family

ID=17617909

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63279931A Pending JPH02126317A (en) 1988-11-04 1988-11-04 Data format converting system

Country Status (1)

Country Link
JP (1) JPH02126317A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5924373A (en) * 1997-09-22 1999-07-20 Brother Kogyo Kabushiki Kaisha Electronic sewing machine control having numeric keys on display
JP2004213622A (en) * 2002-12-27 2004-07-29 Arm Ltd Data processing device and method converting number between fixed point display and floating point display

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6116325A (en) * 1984-07-02 1986-01-24 Oki Electric Ind Co Ltd Floating point operating system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6116325A (en) * 1984-07-02 1986-01-24 Oki Electric Ind Co Ltd Floating point operating system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5924373A (en) * 1997-09-22 1999-07-20 Brother Kogyo Kabushiki Kaisha Electronic sewing machine control having numeric keys on display
JP2004213622A (en) * 2002-12-27 2004-07-29 Arm Ltd Data processing device and method converting number between fixed point display and floating point display

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