JPH0218149U

JPH0218149U -

Info

Publication number: JPH0218149U
Application number: JP9326288U
Authority: JP
Priority date: 1988-07-14
Filing date: 1988-07-14
Publication date: 1990-02-06

Description

[Brief explanation of drawings]

第１図はこの考案の一実施例を示すブロツク図
、第２図は従来のコマンド装置を示すブロツク図
である。図において１はシリアル・コマンド信号、２は
シリアル・パラレル変換回路、３はアドレスデー
タ、４はコマンドデータ、５はレジスタ回路、６
はデータ信号、７はアドレス選択回路、８はアド
レス選択信号、９は照合回路、１０は一致信号、
１１はコマンド実行信号、１２はドライブ回路、
１３はコマンド出力イネーブル信号、１４はマル
チプレクサ回路、１５ａはコマンドライン１、１
５ｂはコマンドライン２、１５ｃはコマンドライ
ン３、１６はＲＯＭ回路、１７はＲＯＭデータ信
号である。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 diagram showing an embodiment of this invention, and FIG. 2 is a block diagram showing a conventional command device. In the figure, 1 is a serial command signal, 2 is a serial-parallel conversion circuit, 3 is address data, 4 is command data, 5 is a register circuit, and 6
is a data signal, 7 is an address selection circuit, 8 is an address selection signal, 9 is a verification circuit, 10 is a match signal,
11 is a command execution signal, 12 is a drive circuit,
13 is a command output enable signal, 14 is a multiplexer circuit, 15a is a command line 1, 1
5b is a command line 2, 15c is a command line 3, 16 is a ROM circuit, and 17 is a ROM data signal. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims

[Scope of utility model registration request]

a serial-to-parallel conversion circuit that receives a serial command signal consisting of an address and data and converts it into parallel address data and parallel command data; and a register circuit that stores and holds the address data and command data;
A ROM circuit that receives an address selection signal output from the register circuit and outputs predetermined storage contents corresponding to the address selection signal as a ROM data signal; A matching circuit outputs a match signal when the two match, a drive circuit outputs a command output enable signal when it receives a match signal, and a drive circuit selects one of multiple command lines according to the address selection signal and outputs the command. A command device consisting of a multiplexer circuit that outputs a data signal from a selected command line upon receiving an enable signal.