EP0487910A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Portable computer for varying read/write cycle according to type of memory card

Assignee: Toshiba Corp

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Filing: 1991-10-28

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Granted: —

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Expires: 2011-10-28

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Abstract

Abstract Whether or not an extension memory card is connected to a portable computer is checked by referring to a specific pin of the extension memory card. If the extension memory card is connected, it is checked if the connected memory card is one operated at high speed or one operated at low speed. In order to attain a read/write cycle corresponding to the operation speed of the connected extension memory card, if the extension memory card operated at high speed is connected, a 1-wait value is set in an I/O register, and when the memory card operated at low speed is connected, a 2-wait value is set in the I/O register. The extension memory card is accessed in the read/write cycle based on the wait value set in the I/O register.

Inventors

👤 Shuzo c/o Intellectual Property Div. Nakajima

Bibliographic Details

Application Number —

Jurisdiction EP

Data Source google_patents

Last Synchronized 2026-10-30 14:07

CPC Classifications

G; G06; G06F; G06F13/00; G06F13/38; G06F13/42; G06F13/4204; G06F13/4234; G06F13/4243; G06F13/14

Claims Analysis

Total Claims: 2

Claim 1

Independent Claim 176 words

A portable computer having a connection port for an extension memory operated at high speed, and an extension memory operated at low speed, comprising: parameter storage means (51) for storing a parameter for varying a read/write cycle of the extension memory; first judgment means (11) for judging whether or not an extension memory is connected to said connection port; second judgment means (11) for, when an extension memory is connected to said connection port, judging whether the extension memory is the extension memory operated at high speed or the extension memory operated at low speed; means (11) for, when said second judgment means determines the extension memory operated at high speed, setting a first parameter indicating a high-speed read/write cycle in said parameter storage means, and for, when said second judgment means determines the extension memory operated at low speed, setting a second parameter indicating a low-speed read/write cycle in said parameter storage means; and means (11) for accessing the extension memory in the read/write cycle indicated by the parameter stored in said parameter storage means.

Claim 2

Dependent Claim 125 words

A portable computer having a connection port for extension memories having different storage capacities, comprising: parameter storage means (51) for storing a parameter for varying a read/write cycle of the extension memory; first judgment means (11) for judging whether or not an extension memory is connected to said connection port; second judgment means (11) for, when an extension memory is connected to said connection port, judging a capacity of the extension memory; means (11) for setting the parameter for varying the read/write cycle of the extension memory in said parameter storage means in accordance with the capacity determined by said second judgment means; and means (11) for accessing the extension memory in the read/write cycle indicated by the parameter stored in said parameter storage means.

References Cited (Backward Citations)

EP0253095A2 Cited

EP0058795A2 Cited

US4769764A Cited

EP0386935A2 Cited

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