JPH02144199U - - Google Patents
Info
- Publication number
- JPH02144199U JPH02144199U JP5280489U JP5280489U JPH02144199U JP H02144199 U JPH02144199 U JP H02144199U JP 5280489 U JP5280489 U JP 5280489U JP 5280489 U JP5280489 U JP 5280489U JP H02144199 U JPH02144199 U JP H02144199U
- Authority
- JP
- Japan
- Prior art keywords
- serial
- data
- access memory
- data register
- address
- 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
- 230000009977 dual effect Effects 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Static Random-Access Memory (AREA)
- Image Input (AREA)
Description
第1図は本考案の一実施例のブロツク図、第2
図は第1図のセレクタの構成図、第3図は動作説
明に供するタイミングチヤート、第4図は従来例
のブロツク図、第5図はRAM部のメモリセルと
SAM部のデータレジスタとのアドレスの対応関
係を示す図、第6図は第4図の従来例のタイミン
グチヤートである。
6……メモリセル、7……データレジスタ、8
……セレクタ、9……アツプダウンカウンタ部。
Figure 1 is a block diagram of one embodiment of the present invention;
The figure is a block diagram of the selector in Figure 1, Figure 3 is a timing chart to explain the operation, Figure 4 is a block diagram of the conventional example, and Figure 5 is the address of the memory cell in the RAM section and the data register in the SAM section. FIG. 6 is a timing chart of the conventional example shown in FIG. 4. 6...Memory cell, 7...Data register, 8
...Selector, 9...Up-down counter section.
Claims (1)
メモリ部とを備え、前記シリアルアクセスメモリ
部は、シリアルデータが入出力されるデータレジ
スタと、シリアルクロツクを計数して前記データ
レジスタのアドレスを発生するセレクタ回路とを
有し、前記シリアルデータの入出力を順方向に行
うデユアルポートメモリにおいて、 前記セレクタ回路は、前記シリアルデータの入
出力方向を、前記順方向または逆方向のいずれか
に切換えるための切換信号に基づいて、前記シリ
アルクロツクによつて前記データレジスタのアド
レスをインクリメントまたはデクリメントするア
ツプダウンカウンタ部を有することを特徴とする
デユアルポートメモリ。[Claims for Utility Model Registration] Comprised of a random access memory section and a serial access memory section, the serial access memory section includes a data register into which serial data is input/output, and a data register that counts serial clocks to input and output serial data. and a selector circuit that generates an address, and inputs and outputs the serial data in a forward direction. 1. A dual port memory comprising an up/down counter section that increments or decrements the address of the data register using the serial clock based on a switching signal for switching to a dual port memory.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5280489U JPH02144199U (en) | 1989-05-08 | 1989-05-08 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5280489U JPH02144199U (en) | 1989-05-08 | 1989-05-08 |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH02144199U true JPH02144199U (en) | 1990-12-06 |
Family
ID=31573425
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5280489U Pending JPH02144199U (en) | 1989-05-08 | 1989-05-08 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH02144199U (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6121540A (en) * | 1984-07-09 | 1986-01-30 | Nec Corp | Memory device |
JPS63147244A (en) * | 1986-12-10 | 1988-06-20 | Fujitsu Ltd | Picture memory circuit |
-
1989
- 1989-05-08 JP JP5280489U patent/JPH02144199U/ja active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6121540A (en) * | 1984-07-09 | 1986-01-30 | Nec Corp | Memory device |
JPS63147244A (en) * | 1986-12-10 | 1988-06-20 | Fujitsu Ltd | Picture memory circuit |
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