Method and system for direct access to flash modules

A method for testing a memory device having a substrate, a controller disposed on the substrate and providing an external interface, and a plurality of flash memory dies connected to the controller through an internal interface, the method comprising:

• operating a bypass pin in the external interface to enable the controller to enter in a direct access state in which a mode selection pin and a data pin in the external interface are operational;
• providing a plurality of predetermined input-output modes of the controller in the direct access state;
• triggering, by the mode selection pin in the external interface, the controller to receive a mode code, which indicates one of the plurality of predetermined input-output modes, on the data pin in the external interface, and to receive a mode code value, which determines information under the predetermined input-output mode indicated by the mode code, on the data pin;
• and
• directly accessing, by use of the data pin, the plurality of flash memory dies through the controller.

A controller for controlling a plurality of flash memory dies, comprising:

• an external interface;
• and
• an internal interface, through which the plurality of flash memory dies are connected to the controller;
• wherein:
• the external interface includes at least a bypass pin, a mode selection pin, and a data pin and is used by an external host to direct access the plurality of flash memory dies through the controller;
• the bypass pin is used to enable the controller to enter in a direct access state in which the mode selection pin and the data pin are operational;
• and
• the mode selection pin is used to trigger the controller to receive a mode code on the data pin, the mode code indicating one of a plurality of predetermined input-output modes of the controller in the direct access state, and to receive a mode code value on the data pin, the mode code value determining information under the predetermined input-output mode indicated by the mode code.