JPH02118341U - - Google Patents
Info
- Publication number
- JPH02118341U JPH02118341U JP2690289U JP2690289U JPH02118341U JP H02118341 U JPH02118341 U JP H02118341U JP 2690289 U JP2690289 U JP 2690289U JP 2690289 U JP2690289 U JP 2690289U JP H02118341 U JPH02118341 U JP H02118341U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- read
- write
- pulse
- clock
- 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
Links
- 230000001360 synchronised effect Effects 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 4
Landscapes
- Time-Division Multiplex Systems (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
Description
第1図はこの考案の一実施例によるクロツク乗
せ換え回路のブロツク構成図、第2図は第1図の
各部の動作波形図、第3図は従来のクロツク乗せ
換え回路のブロツク構成図、第4図は第3図の各
部動作波形図である。
図において、1は書込みデータ入力端子、2は
フレーム同期パルス入力端子、3は書込みクロツ
ク入力端子、4は書込みリセツトパルス発生回路
、5は読出しクロツク入力端子、6は読出し同期
パルス発生回路、7は位相比較回路、71はウイ
ンドウパルス発生回路、72はウインドウ回路、
73は論理和回路、8はカウント回路、9はメモ
リ回路、10は読出しデータ出力端子を示す。な
お、図中、同一符号は同一、または相当部分を示
す。
FIG. 1 is a block configuration diagram of a clock transfer circuit according to an embodiment of this invention, FIG. 2 is an operation waveform diagram of each part of FIG. 1, and FIG. 3 is a block configuration diagram of a conventional clock transfer circuit. FIG. 4 is an operational waveform diagram of each part of FIG. 3. In the figure, 1 is a write data input terminal, 2 is a frame synchronization pulse input terminal, 3 is a write clock input terminal, 4 is a write reset pulse generation circuit, 5 is a read clock input terminal, 6 is a read synchronization pulse generation circuit, and 7 is a read synchronization pulse generation circuit. A phase comparison circuit, 71 a window pulse generation circuit, 72 a window circuit,
73 is an OR circuit, 8 is a count circuit, 9 is a memory circuit, and 10 is a read data output terminal. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.
Claims (1)
書込みリセツトパルスを出力する書込みリセツト
パルス発生回路と、 この書込みリセツトパルスと書込みクロツクと
を用いて書込みデータを所定番地から書込み、読
出しリセツトパルスと読出しクロツクとを用いて
書き込まれたデータを所定番地から読出し、読出
しデータを出力するメモリ回路と、 前記書き込みリセツトパルスと読出しクロツク
とを用いて読み出しクロツクに同期した同期パル
スを出力する読出し同期パルス発生回路と、前記
読み出しクロツクをカウントするカウント回路と
、このカウント回路の出力と前記読出し同期パル
スのフレーム位相を比較する位相比較回路とを有
するクロツク乗せ換え回路において、前記位相比
較回路を前記カウント回路の出力をデコードし、
前記読出し同期パルスの前後にウインドウパルス
を出力するウインドウパルス発生回路、ウインド
ウ回路および論理和回路により構成し、 前記ウインドウパルスにより前記読出し同期パ
ルスをインヒビツトする様にしたことを特徴とす
るクロツク乗せ換え回路。[Claim for Utility Model Registration] A write reset pulse generation circuit that outputs a write reset pulse using a frame synchronization pulse and a write clock, and a write data write and read circuit that uses the write reset pulse and write clock to write and read write data from a predetermined location. A memory circuit that reads written data from a predetermined location using a reset pulse and a read clock and outputs the read data; and a read circuit that uses the write reset pulse and the read clock to output a synchronous pulse synchronized with the read clock. In a clock transfer circuit having a synchronization pulse generation circuit, a count circuit for counting the read clock, and a phase comparison circuit for comparing the output of the count circuit with the frame phase of the read synchronization pulse, the phase comparison circuit is Decode the output of the count circuit,
A clock transfer circuit comprising a window pulse generation circuit that outputs a window pulse before and after the read synchronization pulse, a window circuit, and an OR circuit, and wherein the read synchronization pulse is inhibited by the window pulse. .
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2690289U JPH02118341U (en) | 1989-03-08 | 1989-03-08 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2690289U JPH02118341U (en) | 1989-03-08 | 1989-03-08 |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH02118341U true JPH02118341U (en) | 1990-09-21 |
Family
ID=31248944
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2690289U Pending JPH02118341U (en) | 1989-03-08 | 1989-03-08 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH02118341U (en) |
-
1989
- 1989-03-08 JP JP2690289U patent/JPH02118341U/ja active Pending
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