Code generation control device

• US 5,126,959 A
• Filed: 11/16/1990
• Issued: 06/30/1992
• Est. Priority Date: 11/20/1989
• Status: Expired due to Fees

• Current Assignee: Clarion Co., Ltd. (Faurecia SA)
• Original Assignee: Clarion Co., Ltd. (Faurecia SA)
• Inventors: Kurihara, Takao
• Primary Examiner(s): Malzahn, David H.
• Application Number:
  US07/614,922
• Time in Patent Office: 592 Days
• Field of Search: 364/717, 377/33, 377/26, 370/18
• US Class Current: 708/250
• CPC Class Codes: G06F 2207/581 Generating an LFSR sequence, e.g. an m-sequence; sequence may be generated without LFSR, e.g. using Galois Field arithmetic
• CPC Class Codes: G06F 2207/583 Serial finite field implementation, i.e. serial implementation of finite field arithmetic, generating one new bit or trit per step, e.g. using an LFSR or several independent LFSRs; also includes PRNGs with parallel operation between LFSR and outputs
• CPC Class Codes: G06F 7/584 using finite field arithmetic, e.g. using a linear feedback shift register
• CPC Class Codes: H03K 3/84 Generating pulses having a predetermined statistical distribution of a parameter, e.g. random pulse generators

Abstract

A code generation control device is disclosed, which is provided with circuits indicated in following items (a) to (d) in order to set initial information for generating codes in a plurality of PNGs:

(a) a strobe pulse generating section, which outputs a strobe pulse, every time the initial information is set in one PNG;

(b) a counting section, which counts the output of (a) on the basis of the number of PNGs, in which the initial information is set;

(c) a decoder section, which decodes the count value of (b) and chip-selects one of the plurality of PNGs; and

(d) a control section, which outputs a strobe pulse to each of the PNGs and a code chip number counting section on the basis of a code switching control signal at that time on the basis of a signal outputted by (b), when the count value reaches a predetermined number of PNGs, in which the initial information is set, and the strobe pulse outputted by (a).

Claims

1. A code generation control device, which consists of a memory, in which initial information for generating an M sequence code is stored;

a plurality of pseudo noise code generators;

a control device for setting initial information necessary for generating codes from said memory to said plurality of pseudo noise code generators; and

an external control circuit for setting the heading address of said memory and the number of said pseudo noise code generators;

wherein said control device comprises;

a data number counting section, which counts the number of initial information sets for generating codes, when a clock signal is inputted therein, and outputs a termination signal on the basis of the termination of the data number counting;

an address counting section, which can specify an address in said memory on the basis of an inputted clock signal and set said heading address;

a counter control section, which puts said data number counting section and said address counting section in the enable state on the basis of a counter load signal from said external control circuit;

an initial strobe signal generating section for generating a first strobe signal on the basis of said termination signal;

a strobe signal counting section, in which a count value corresponding to the number of said pseudo noise code generators is set by said external control circuit, and which outputs said count value on the basis of said first strobe signal and at the same time outputs a trigger signal, when said count value reaches a predetermined value;

a decoder section, which decodes said count value of said strobe signal counting section and chip-selects one of said plurality of pseudo noise code generators; and

a strobe signal generating means, which generates a second strobe signal to said plurality of pseudo noise code generators on the basis of said trigger signal.

2. A code generation control device according to claim 1 wherein said strobe signal generating section, in which a code switching control signal is inputted further from said external control circuit, generates said second strobe signal on the basis of the state of said code switching control signal, corresponding to the input of said trigger signal.