JPS62175499U - - Google Patents
Info
- Publication number
- JPS62175499U JPS62175499U JP6340886U JP6340886U JPS62175499U JP S62175499 U JPS62175499 U JP S62175499U JP 6340886 U JP6340886 U JP 6340886U JP 6340886 U JP6340886 U JP 6340886U JP S62175499 U JPS62175499 U JP S62175499U
- Authority
- JP
- Japan
- Prior art keywords
- output
- signal
- input
- nand gate
- flip
- 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
- 230000000630 rising effect Effects 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 1
Landscapes
- Image Input (AREA)
Description
第1図は本考案の一実施例を示す回路図、第2
図は第1図に示す画像用メモリ制御回路のタイム
チヤートである。
1,2……フリツプフロツプ、3,4,5,6
……NANDゲート、7,8……メモリ、a……
データ終了信号、b……クロツク信号、c……書
込み/読出し制御信号、l……c信号の反転信号
、d……メモリ7書込選択信号、e……メモリ8
書込選択信号、f……メモリ7読出選択信号、g
……メモリ8読出選択信号。
Figure 1 is a circuit diagram showing one embodiment of the present invention;
The figure is a time chart of the image memory control circuit shown in FIG. 1, 2...flip flop, 3, 4, 5, 6
...NAND gate, 7, 8...Memory, a...
Data end signal, b...Clock signal, c...Write/read control signal, l...Inverted signal of c signal, d...Memory 7 write selection signal, e...Memory 8
Write selection signal, f...Memory 7 read selection signal, g
...Memory 8 read selection signal.
Claims (1)
1出力と第2出力のレベルが反転する第1のフリ
ツプフロツプと、前記第1のフリツプフロツプか
らの第1出力とクロツク信号と書込み時にローレ
ベルである書込み/読出し制御信号の反転した信
号が入力される第1NANDゲートと、前記第1
のフリツプフロツプからの第2出力と、クロツク
信号と前記書込み/読出し制御信号の反転した信
号が入力される第2NANDゲートと、前記第1
フリツプフロツプの第1出力が入力され前記書込
み/読出し制御信号の立上がりが入力されたとき
入力信号と同じレベルの信号を第1出力へ、入力
信号の反転信号を第2出力へ出力する第2のフリ
ツプフロツプと、前記第2フリツプフロツプの第
1出力と読出し時に、ハイレベルである書込み/
読出し制御信号が入力される第3NANDゲート
と、前記第2のフリツプフロツプの第2出力と前
記書込み/読出し制御信号が入力される第4NA
NDゲートと、前記第1NANDゲートの出力が
ライトイネーブル端子に前記第3NANDゲート
の出力がアウトプツトイネーブル端子に接続され
た第1のメモリと、前記第2NANDゲートの出
力がライトイネーブル端子と前記第4NANDゲ
ートの出力がアウトプツトイネーブル端子に接続
された第2のメモリとを含むことを特徴とする画
像用メモリ制御回路。 a first flip-flop whose first and second output levels are inverted each time a rising edge of a data end signal is input; a first output from the first flip-flop; a clock signal; /a first NAND gate to which an inverted signal of the read control signal is input;
a second output from the flip-flop, a second NAND gate to which a clock signal and an inverted signal of the write/read control signal are input;
a second flip-flop that receives the first output of the flip-flop and outputs a signal at the same level as the input signal to the first output and an inverted signal of the input signal to the second output when the rising edge of the write/read control signal is input; and the first output of the second flip-flop and the write/write signal which is at a high level during reading.
a third NAND gate to which a read control signal is input; a fourth NAND gate to which a second output of the second flip-flop and the write/read control signal are input;
an ND gate, a first memory in which the output of the first NAND gate is connected to a write enable terminal, the output of the third NAND gate is connected to an output enable terminal, and the output of the second NAND gate is connected to a write enable terminal and the fourth NAND gate; and a second memory having an output of the gate connected to an output enable terminal.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6340886U JPS62175499U (en) | 1986-04-25 | 1986-04-25 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6340886U JPS62175499U (en) | 1986-04-25 | 1986-04-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS62175499U true JPS62175499U (en) | 1987-11-07 |
Family
ID=30898605
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6340886U Pending JPS62175499U (en) | 1986-04-25 | 1986-04-25 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS62175499U (en) |
-
1986
- 1986-04-25 JP JP6340886U patent/JPS62175499U/ja active Pending
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