JPH0437222A - Crc coding/decoding circuit - Google Patents

Crc coding/decoding circuit

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Publication number
JPH0437222A
JPH0437222A JP14143990A JP14143990A JPH0437222A JP H0437222 A JPH0437222 A JP H0437222A JP 14143990 A JP14143990 A JP 14143990A JP 14143990 A JP14143990 A JP 14143990A JP H0437222 A JPH0437222 A JP H0437222A
Authority
JP
Japan
Prior art keywords
circuit
registers
exclusive
bit
decoding circuit
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
JP14143990A
Other languages
Japanese (ja)
Inventor
Toshiyuki Izeki
利之 井関
Shoichi Miyazawa
章一 宮沢
Tsuguyoshi Hirooka
嗣喜 広岡
Hiroshi Kurihara
博司 栗原
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.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP14143990A priority Critical patent/JPH0437222A/en
Publication of JPH0437222A publication Critical patent/JPH0437222A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To attain high speed CRC coding/decoding by constituting the circuit with m-sets (m is a measure of n) of k-bit (k=n/m) registers and an exclusive OR circuit, thereby using the registers of identical performance and exclusive OR circuit. CONSTITUTION:The circuit consists of m-sets (m is a measure of n) of k-bit (k=n/m) registers 101, 102 and an exclusive OR circuit (+). The k-bit registers 101, 102 latch a k-bit data in a same timing signal and output the result, the exclusive OR circuit (+) ORs exclusively two inputs and outputs the result, thereby allowing the CRC coding/decoding circuit to attain high speed arithmetic operation. That is, since the registers 101, 102 receive a clock synchronouly with an 8-bit input latches and output the 8-bit data, the high speed arithmetic operation is implemented because an 8-times of period is attained with respect to the operating clock 2. Thus, the high speed CRC coding/decoding circuit is constituted by using the registers of indentical performance and the exclusive OR circuit.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明はCRC符号化・復号化回路に関する。[Detailed description of the invention] [Industrial application field] The present invention relates to a CRC encoding/decoding circuit.

〔従来の技術〕[Conventional technology]

従来の装置は、誤シ訂正符号化技術の応用事例−ディジ
タル記像編−(トリケップス社)に記載のように、CR
C符号化・復号化回路は、n次の生成多項式で演算する
場合、n個のレジスタと排他的論理和回路で構成され、
データ情報をシリアルに入力および処理を行い、CRC
の符号化・復号化を行なっていた。
Conventional devices are capable of performing CR as described in Application Examples of Error Correction Coding Technology - Digital Recording Edition (Triceps).
The C encoding/decoding circuit is composed of n registers and an exclusive OR circuit when operating with an n-th order generator polynomial,
Serial input and processing of data information, CRC
was used for encoding and decoding.

たとえば、x16 + X+2 + x5 + 1の生
成多項式で演算するCRC符号化・復号化回路は第2図
のようになジ、入力データDt(it=7.6,5・・
・)VC同期した動作クロック2で、入力データDtの
77ト演算を行う。
For example, a CRC encoding/decoding circuit that operates with a generator polynomial of x16 +
・) Performs 77 operations on input data Dt using operation clock 2 synchronized with VC.

このようなCRC符号化・復号化回路に、磁気ディスク
装置等の記憶装置や、通信装置の転送データの諒9検出
のために用いられるが、ホストコンピュータの処理の高
速化に伴い、記憶装置や通信装置等の周辺装置の転送速
度の高速化が望まれている。
Such CRC encoding/decoding circuits are used to detect errors in data transferred from storage devices such as magnetic disk drives and communication devices, but as the processing speed of host computers increases, storage devices and It is desired to increase the transfer speed of peripheral devices such as communication devices.

ところが、第2図に示−fcRc符号化・復号化回路で
に、入力データが高速化されるとレジスタのデータセッ
トアツプ時間、および、出力遅延時間や排他的論理和回
路の出力遅延時間が問題となシ、高速な動作クロック2
でシフト演算が行えない。
However, in the fcRc encoding/decoding circuit shown in Figure 2, when the input data speed is increased, there are problems with the data set up time of the register, the output delay time, and the output delay time of the exclusive OR circuit. Tonashi, high-speed operation clock 2
Shift operation cannot be performed with .

〔発明が解決しようとするvjl、題〕上記従来技術は
、レジスタのデータセットアツプ時間、および、出力遅
延時間、排他的論理利回路の出力遅延時間の点くついて
の考慮がされておらず、高速な入力データ情報の符号化
・復号化が行えないという問題があった。
[Problem to be solved by the invention] The above prior art does not take into consideration the data set-up time of the register, the output delay time, and the output delay time of the exclusive logic circuit. There was a problem in that high-speed encoding and decoding of input data information could not be performed.

本発明の目的は、同等の性能のレジスタおよび排他的論
理和回路を使用して、高速にCRCの符号化・復号化の
行えるCRC符号化・復号化回路を提供することにある
An object of the present invention is to provide a CRC encoding/decoding circuit that can perform CRC encoding/decoding at high speed using registers and exclusive OR circuits with equivalent performance.

〔課@を解決するための手段〕[Means to solve section @]

上記目的を達成するために、本発明はn(nは整数)次
の生成多項式で演算するCRC符号化・復号化回路に対
して III(fIIはnの約数)個のk (k=n7m )
ビットのレジスタと、排他的論理和回路とを備えること
を特徴とする。
In order to achieve the above object, the present invention provides a CRC encoding/decoding circuit that operates with a generator polynomial of order n (n is an integer), and k (k=n7m )
It is characterized by comprising a bit register and an exclusive OR circuit.

〔作用〕[Effect]

kビットのレジスタは、同一のタイミング信号でにビッ
トのデータをラッチして出力する。
The k-bit register latches and outputs bit data using the same timing signal.

排他的論理和回路は、二つの入力の排他的論理和を演算
して出力する。
The exclusive OR circuit calculates the exclusive OR of two inputs and outputs the result.

それによって、CRC符号化・復号化回路は高速な演算
が行える。
This allows the CRC encoding/decoding circuit to perform high-speed calculations.

〔実施例〕〔Example〕

以下、本発明の一夾施恍を第1区および第2図により説
明する。
Hereinafter, the implementation of the present invention will be explained with reference to Section 1 and FIG. 2.

第1図は、本発明のCRC符号化・復号化回路を示すも
ので、101および102はへビットのレジスタで動作
クロック10入力によシ、データを保持、および、出力
する。
FIG. 1 shows a CRC encoding/decoding circuit according to the present invention. Reference numerals 101 and 102 are bit registers which hold and output data in response to an operating clock 10 input.

第2図は、従来のCRC符号化・復号化回路を示すもの
で、  2007iいし215は、7リツグフロツプで
、動作クロック20人力によシ、データを保持および出
力する。
FIG. 2 shows a conventional CRC encoding/decoding circuit. 2007i to 215 has 7 logic flops, operates at 20 clocks, and holds and outputs data.

従来、生成多項式X16+X12+X5+1で演算する
CRC符号化・復号化回路は、第2図に示すように、シ
リアルデータDt(A=7.6.5・・・)を入力し、
Dtに同期した動作クロック2によシ、200 ないし
215の7リツプ70ツブのデータの保持を繰シ返して
、シフト演算をしていた。
Conventionally, a CRC encoding/decoding circuit that operates using the generator polynomial X16+X12+X5+1 receives serial data Dt (A=7.6.5...) as shown in FIG.
Shift operations were performed by repeatedly holding 70 bits of data from 200 to 215 using an operation clock 2 synchronized with Dt.

そこで、各7リツプフロツプの出力f:c、、C,。Therefore, the output f of each of the 7 lip-flops is c, , C,.

=C15とし、シリアルデータD7が入力した時の7リ
ツプフロツプの出力をC3−C15とすると、第2図よ
り1 c’=c0■D     C=C0 C′=00C′=00 C′−00C′=00 2    +                  1
0   9c’ =c’       c’  ==0
0S    2                11
    T。
= C15, and the output of the 7 lip-flop when serial data D7 is input is C3-C15. From Fig. 2, 1 c'=c0■D C=C0 C'=00C'=00 C'-00C'= 00 2 + 1
0 9c'=c'c' ==0
0S 2 11
T.

C−00C′、2=C!、■(c75■D、)c’5=
co40+(c’50+p、)  c’1.=c:2C
’ =C0Q’ ==(:0 C’ =C0C’  ==(:0  となる。
C-00C', 2=C! ,■(c75■D,)c'5=
co40+(c'50+p,) c'1. =c:2C
'=C0Q' ==(:0 C'=C0C' ==(:0).

次に、シリアルデータD。が入力した時の7リツプ70
ツグの出力ヲC乙〜Cτ5とすると、第2区と上式よシ C2=C0■D Cτ=C〕、■D7 C2=C0 C2=00 CS=C−■(C15■Dy) C二=C:■(C!5■D、) C二=C: c: −C: C2=00 C2=00 C2=c0■(C■D) +2   10    14   6 0:5”011■(C!5■D、) C2=00 シリアルデータD5が入力した時の7リツグ70ツグの
出力【C二〜C:5とすると第2因と上式よpC5=C
0Cs=c0 0  1!              6  5c5
 =cOc: =c: C5= C’      c: 、W c:C:”C:
        c:t=<” ”” ”      
  C12=C:■(c’:It■D5)C;−弓■(
C:、■D5)   C’、、zc’、。■(c:4■
D6)Cs6=C:■(C:4■D7 )C14−c:
1■(c:5■D、)cS =c:■(C15■Dy 
)  c:s =c? 2シリアルデータD4が入力し
た時の7リツグ70ツグの出力tc:〜C:、とすると
、第2図と上式よシ弓=C:2■      Q’、 
−(’、■(c:5■D、)Q’ wz Q’■   
   c:=c:1  1番 C4フcO■      C4=c0 C’、cm Cτ6■      (、謔弓c’=c’ 4 。        c:z=C:e)(c′:、■
D、)CS w C?■(C:2eD4)   c:s
−<■(c:5■D、)c: 111m <■(C:、
■D5 )C14−010■(c!4■D6)cニーc
:o+(c:、■D4 )c:5−c11■(C:、■
D、)シリアルデータD、が入力し走時の7リツプ70
ツグの出力ヲC:〜Ci5とすると、第2図と上式よp
C:+x(C:、(i)D、))■n、      c
ニーc:O+(c:40+p、)C’−C’ Q+D 
     cニーc:■(C:seD、)CトC:、(
i)D、      C?oICosc5 、、、cD
■D     ぐ、=C=s   14  6 cニーc:、@o、      <2=’S■I: (
C:、■(<$、))eD。
Next, serial data D. 7 lip 70 when entered
If the output of Tsugu is C~Cτ5, then the second ward and the above equation are C2=C0■D Cτ=C], ■D7 C2=C0 C2=00 CS=C−■(C15■Dy) C2= C:■(C!5■D,) C2=C: c: -C: C2=00 C2=00 C2=c0■(C■D) +2 10 14 6 0:5"011■(C!5 ■D,) C2 = 00 When serial data D5 is input, the output of 7rig 70tsugu [C2 ~ C: If 5, then the second factor and the above equation, pC5 = C
0Cs=c0 0 1! 6 5c5
=cOc: =c: C5=C' c: , W c:C:"C:
c:t=<” ”” ”
C12=C:■(c':It■D5)C;-bow■(
C:,■D5) C',,zc',. ■(c:4■
D6) Cs6=C:■(C:4■D7)C14-c:
1■(c:5■D,)cS =c:■(C15■Dy
) c:s = c? 2 When serial data D4 is input, the output of 7 rigs and 70 tsugs is tc: ~ C:, then Figure 2 and the above equation = C: 2 ■ Q',
-(',■(c:5■D,)Q' wz Q'■
c:=c:1 No. 1 C4fu cO■ C4=c0 C', cm Cτ6■ (, 謔 Bow c'=c' 4. c:z=C:e) (c':,■
D,) CS w C? ■(C:2eD4) c:s
-<■(c:5■D,) c: 111m <■(C:,
■D5)C14-010■(c!4■D6)c knee c
:o+(c:,■D4)c:5-c11■(C:,■
D,) 7 rip 70 when serial data D is input and run
If the output of Tsug is C: ~Ci5, then p according to Fig. 2 and the above equation.
C:+x(C:, (i)D,)) ■n, c
Knee c:O+(c:40+p,)C'-C'Q+D
c knee c:■(C:seD,)CtoC:,(
i) D, C? oICosc5,,,cD
■D gu,=C=s 14 6 c knee c:, @o, <2='S■I: (
C:,■(<$,))eD.

く=C本((、■(<β  C:M=C:■(C:2■
D4)D7))eD1 C−=C:■(C:2e)D4)   c:、−c:e
(c:、ep、)CツーC:■(C:、■DS )  
<1−<。■(C:4■D、)シリアルデータD2が入
力した時の7リツプ70ツブの出力tC4tJ’=C:
sとすると、第2図と上式より cニー(c:、4→((4■D、))eD2(:、ニー
((’、、■(<β7)eD。
Ku=C books ((,■(<β C:M=C:■(C:2■
D4) D7)) eD1 C-=C: ■ (C:2e) D4) c:, -c:e
(c:, ep,) C to C: ■ (C:, ■DS)
<1-<. ■(C:4■D,) 7-lip 70-tub output when serial data D2 is input tC4tJ'=C:
If s, then from Fig. 2 and the above equation, c knee(c:, 4→((4■D,))eD2(:, knee((',,■(<β7)eD).

”2 ” < 2■D4 C8=C0■D B    1B    S Cζべ0■D C: −”2(f)(c”、、■D、)C’、m C’
、■(C:4■D、) c:。−c:(i)(c’:、O+n、 )C’、、w
m CoS <2=C″、■〔(<β ((4■D、))■D、) <”(<seD、)■[:(C:。e) <5=<■[
(C:、e)(C:4eD4月■D2〕(c!5■D7
))■D、)c:=C匝(c’:、■   c、’:4
=c’:、■(c!2■D、)(C:5■D7))eD
"2"< 2■D4 C8=C0■D B 1B S Cζbe0■D C: -"2(f)(c",,■D,)C', m C'
,■(C:4■D,) c:. -c:(i)(c':,O+n, )C',,w
m CoS <2=C″, ■[(<β ((4■D,))■D,) <”(<seD,)■[:(C:.e) <5=<■[
(C:, e) (C:4eD April ■D2] (c!5■D7
))■D,)c:=C匝(c':,■c,':4
=c':,■(c!2■D,)(C:5■D7))eD
.

弓=<■(C:2■D4)  c:5=c:■(c’:
5■D、)シリアルデータD、が入力した時の7リツプ
70ツブの出力ヲ弓〜c:5とすると、第2図と上式よ
シ C二= (C:@ (c”、5e)p6) )O+D。
Bow=<■(C:2■D4) c:5=c:■(c':
5■D,) When the serial data D is input, the output of 7 lips and 70 tubes is ~c:5. According to Figure 2 and the above formula, C2 = (C: @ (c", 5e) p6)) O+D.

C7,=C¥。■(C:4■D4))■D2C2−〇:
 1■(C:5eD7月■D。
C7,=C¥. ■(C:4■D4))■D2C2-〇:
1■(C:5eDJuly■D.

C二=Cτ、eD4 C7=co■D 4  1s   5 CS”(C:4■D6)■〔(C:■(C!、eD6)
)eD。
C2=Cτ, eD4 C7=co■D 4 1s 5 CS” (C:4■D6)■[(C:■(C!, eD6)
)eD.

C二=(<seD、)■〔(<o■(c14■D6月■
D2c7.=c:■〔(化■(C!5■D、))eD。
C2=(<seD,)■[(<o■(c14■DJune■
D2c7. =c: ■ [( 化■ (C!5■D, )) eD.

弓=C!■(C:2■D4) c: =c:■(C:、■D、) C:o=<■(C:4■D6) C:、−c:o+(c:、(i)D、 )C:2 ” 
CuO〔(C:■(C:、eD5))■D、 )”t 
s =”:■〔(C!。■(C!4■D6月■D2〕C
′−C0■((<、■(C:、■D7月■D5〕C: 
s =<■(C:2■D4) シリアルデータD0が入力した時の7リツプ70ツブの
出力ラフ〜C:5とすると、第2図と上式よpC8o=
= (CuO(C:2■D4))eD。
Bow=C! ■(C:2■D4) c: =c:■(C:, ■D,) C:o=<■(C:4■D6) C:, -c:o+(c:, (i)D , )C:2”
CuO [(C:■(C:, eD5))■D, )"t
s =”:■ [(C!.■(C!4■DJune■D2)]C
'-C0■((<,■(C:,■DJuly■D5]C:
s = < ■ (C: 2 ■ D4) When the serial data D0 is input, the output rough of 7 lip 70 tubes ~ C: 5, then according to Fig. 2 and the above equation, pC8o =
= (CuO(C:2■D4))eD.

C:=(C:■(C!5■D5月■D。C:=(C:■(C!5■DMay■D.

C3=(C0■(Co■D))eD2 C8=(C0■(C0■D))eD。C3=(C0■(Co■D))eD2 C8=(C0■(C0■D))eD.

C8=C0■D <””C:seD、)■[(C:■(C:2■D4))
■Do〕C3=(C0(i)D )eX (<■(C:
、(E)D5月■D、 )cF7= (C:5(i)D
、 )O+t: (C’:。(i)(C:4■D6) 
)■D、)C:=Co■((C?1■(C!、■D7月
■D、〕C3=C0■(C0■D) ?+      124 C:。=C:■(C!、eD5) C8=C0■(C0■D) 11    S      14   6<2= (c
’:■(c’:5o+D、月■((cHo+(cg2■
n4))@p0)013=<■〔(C:■(C!、eD
5))■D、〕c74=co6■c (c:。■(C’
:、eD6) l■Di2)<s=C:■〔(C!5■
D7))■D5〕   となる。
C8=C0■D <””C:seD,)■[(C:■(C:2■D4))
■Do]C3=(C0(i)D)eX (<■(C:
, (E)DMay■D, )cF7= (C:5(i)D
, )O+t: (C':.(i)(C:4■D6)
)■D,)C:=Co■((C?1■(C!,■DJuly■D,)C3=C0■(C0■D) ?+ 124 C:.=C:■(C!, eD5) C8=C0■(C0■D) 11 S 14 6<2= (c
':■(c':5o+D, month■((cHo+(cg2■
n4)) @p0)013=<■[(C:■(C!, eD
5))■D,]c74=co6■c (c:.■(C'
:, eD6) l■Di2)<s=C:■[(C!5■
D7))■D5].

従って、上式は、へビット(D7 + D6 + D5
1 D4 TD5 + D2 * D4. Do)の入
力データに対して、各7リツプフロツプが次段に保持す
るデータを示している0丁なわち、へビットの入力デー
タt−i列処理するCRC符号化・復号化回路は、上式
よシ、第1図のようになる。なお、排他的論理和演算で
は結合の法則A■(B■C)=(A■B)■Cが成立す
ることを利用している。
Therefore, the above formula becomes Hbit(D7 + D6 + D5
1 D4 TD5 + D2 * D4. The CRC encoding/decoding circuit that processes the input data ti column of 0 bits, that is, 0 bits indicating the data to be held in the next stage by each 7 lip-flop, for the input data of Do) is calculated by the above formula. Okay, it should look like Figure 1. Note that the exclusive OR operation utilizes the fact that the associative law A.sub.(B.sub.C)=(A.sub.B).sub.C holds true.

飢1図に示す動作クロック’t”ib八へットの入力デ
ータに同期したクロックで、レジスタ101および10
2に入カレ、へピット分のデータを保持および出力する
。従って、第2図に示す動作クロック2に対して、入信
の周期となり、高速な演算が行える。
The registers 101 and 10 are clocked in synchronization with the input data of the operating clock 't'ib8het shown in Figure 1.
2 holds and outputs the data for the input and the pits. Therefore, the period of reception corresponds to the operation clock 2 shown in FIG. 2, and high-speed calculation can be performed.

なお、従来はシリアルデータを使用しているため、第1
図の回路を用いるには、データのシリアル・パラレルデ
ータ変換回路が必要であるが、磁気ディスク装置等に、
シリアル・パラレルデータ変換回路を内置しており、問
題とはならない。
Note that conventionally, serial data is used, so the first
To use the circuit shown in the figure, a data serial/parallel data conversion circuit is required.
Since the serial/parallel data conversion circuit is installed internally, this should not be a problem.

本実施ガによれば、従来の性能のレジスタや排他的論理
和回路を用いてCRC符号化・復号化回路を構成するこ
とができ、安価で高速演算できるという効果がある。
According to this embodiment, the CRC encoding/decoding circuit can be configured using registers and exclusive OR circuits with conventional performance, and has the advantage of being able to perform high-speed calculations at low cost.

〔発明の効果〕〔Effect of the invention〕

本発明によれば、従来の性能のレジスタ、および、排他
的論理和回路を使用して、高速なCRC符号化・復号化
回路を構成することができ、高速、かつ、安価なシステ
ムの構築が容易である。
According to the present invention, it is possible to configure a high-speed CRC encoding/decoding circuit using conventional performance registers and exclusive OR circuits, and it is possible to construct a high-speed and inexpensive system. It's easy.

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

第1図は本発明の一実施例のCRC符号化・復号化回路
図、第2図は、従来のCRC符号化・復号化回路図であ
る。 101.102・−・レジスタ 200〜215・・・フリップ70ツブ。
FIG. 1 is a CRC encoding/decoding circuit diagram according to an embodiment of the present invention, and FIG. 2 is a conventional CRC encoding/decoding circuit diagram. 101.102...Registers 200-215...Flip 70 knobs.

Claims (1)

【特許請求の範囲】 1、n(nは任意の整数)次の生成多項式で演算するC
RC符号化・復号化回路において、 m(mはnの約数)個のk(k=n/m)ビットのレジ
スタと、排他的論理和回路とよりなることを特徴とする
CRC符号化・復号化回路。
[Claims] C that operates with a generator polynomial of order 1, n (n is any integer)
The CRC encoding/decoding circuit is characterized by comprising m (m is a divisor of n) k (k=n/m) bit registers and an exclusive OR circuit. decoding circuit.
JP14143990A 1990-06-01 1990-06-01 Crc coding/decoding circuit Pending JPH0437222A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14143990A JPH0437222A (en) 1990-06-01 1990-06-01 Crc coding/decoding circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14143990A JPH0437222A (en) 1990-06-01 1990-06-01 Crc coding/decoding circuit

Publications (1)

Publication Number Publication Date
JPH0437222A true JPH0437222A (en) 1992-02-07

Family

ID=15291980

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14143990A Pending JPH0437222A (en) 1990-06-01 1990-06-01 Crc coding/decoding circuit

Country Status (1)

Country Link
JP (1) JPH0437222A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06311049A (en) * 1993-04-20 1994-11-04 Nippon Denki Musen Denshi Kk Crc code calculation circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06311049A (en) * 1993-04-20 1994-11-04 Nippon Denki Musen Denshi Kk Crc code calculation circuit

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