Electronic device with card interface
First Claim
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1. A system having a memory device comprising:
- connector pins including data pins, a command pin, and a power signal pin;
a first register that stores own operation mode information of the memory device, the own operation mode information including bus width information which indicates one of first and second operation modes such that, in the first operation mode, the system receives data using one of the data pins and, in the second mode, the system receives data using four of the data pins;
a controller that outputs the operation mode information to one of the connector pins in response to a first command; and
a second register that stores operation voltage information concerning an operation voltage of the system;
wherein said controller provides the operation voltage information to the command pin to transmit the operation voltage information in response to a second command, andwherein said controller sets the operation mode of the system into one of the first and second operation modes stored in the first register in response to a third command received via a command pin.
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Abstract
When initializing a card-shaped device inserted in a card interface, operation mode acquiring means incorporated in an electronic device acquires operation mode information, stored in a register file incorporated in the card-shaped device, by a predetermined procedure using a predetermined pin. Operation mode setting means incorporated in the electronic device executes signal assignment on a plurality of data pins peculiar to an operation mode indicated by the acquired operation mode information, thereby switching a data transfer width, and allowing the card-shaped device to operate in the operation mode.
42 Citations
9 Claims
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1. A system having a memory device comprising:
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connector pins including data pins, a command pin, and a power signal pin; a first register that stores own operation mode information of the memory device, the own operation mode information including bus width information which indicates one of first and second operation modes such that, in the first operation mode, the system receives data using one of the data pins and, in the second mode, the system receives data using four of the data pins; a controller that outputs the operation mode information to one of the connector pins in response to a first command; and a second register that stores operation voltage information concerning an operation voltage of the system; wherein said controller provides the operation voltage information to the command pin to transmit the operation voltage information in response to a second command, and wherein said controller sets the operation mode of the system into one of the first and second operation modes stored in the first register in response to a third command received via a command pin. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification