External expansion bus interface circuit for connecting a micro control unit, and a digital recording and reproducing apparatus incorporating said interface circuit

• US 5,892,982 A
• Filed: 11/27/1996
• Issued: 04/06/1999
• Est. Priority Date: 11/29/1995
• Status: Expired due to Fees

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Sato, Masafumi, Nakamura, Akihiko, Miyoshi, Tsutomu, Soga, Junji, Mitsuda, Makoto, Tamai, Katsuyuki, Okabe, Masao
• Primary Examiner(s): Meky, Moustafa M.
• Application Number:
  US08/757,280
• Time in Patent Office: 860 Days
• Field of Search: 395/821, 395/822, 395/882, 395/883, 395/309, 365/189.04, 365/189.05, 365/189.06, 365/189.07, 365/233, 365/230.02, 365/230.08, 365/230.03
• US Class Current: 710/62
• CPC Class Codes: G06F 3/0601 Interfaces specially adapted for storage systems
• CPC Class Codes: G06F 3/0682 Tape device
• CPC Class Codes: G11B 20/10 Digital recording or reproducing

Abstract

An external expansion bus interface circuit is provided for connecting a peripheral to a micro control unit to exchange digital information under an external expansion memory mode of the micro control unit. For this purpose, the eternal expansion bus interface circuit includes a means for storing a writing data. Address decoder and a strobe decoder are connected to the micro control unit to directly receive the writing data, an address strobe, and a write strobe. Then the address decoder and strobe decoder produce a write enable signal for enabling the memory to store the data at address designated thereby.

Claims

1. An external expansion bus interface circuit for connecting a peripheral to a micro control unit to exchange digital information under an external expansion memory mode of said micro control unit, said circuit comprising:

memory means for storing a data; and

address decoding means for receiving said data, an address strobe, and a write strobe from said micro control unit to produce an enable signal for enabling said memory means to store said data at address designated said data.

2. A digital recording and reproducing apparatus exchanging digital information between a peripheral and a micro control unit under an external expansion memory mode thereof, said apparatus comprising:

external expansion bus interface circuit for connecting said micro control unit to said peripheral under an external expansion memory mode comprising;

first memory means for storing a data; and

address decoding means for receiving said data, an address strobe, and a write strobe from said micro control unit to produce an enable signal for enabling said memory means to store said data at address designated said data;

second memory means for storing said digital information.