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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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TC58FVM7B2AFT 데이터시트(PDF) 8 Page - Toshiba Semiconductor |
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TC58FVM7B2AFT 데이터시트(HTML) 8 Page - Toshiba Semiconductor |
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8 / 68 page  TC58FVM7(T/B)2AFT(65/80) 2002-10-24 8/68 ID Read Mode ID Read Mode is used to read the device maker code and device code. The mode is useful in that it allows EPROM programmers to identify the device type automatically. ID read can be executed in two ways, as follows: (1) Applying VID to A9 This method is used mainly by EPROM programmers. Applying VID to A9 sets the device to ID Read Mode, outputting the maker code from address 00H and the device code from address 01H. Releasing VID from A9 returns the device to Read Mode. With this method all banks are set to ID Read Mode; thus, simultaneous operation cannot be performed. (2) Input command sequence With this method simultaneous operation can be performed. Inputting an ID Read command sets the specified bank to ID Read Mode. Banks are specified by inputting the bank address (BK) in the third Bus Write cycle of the Command cycle. To read an ID code, the bank address as well as the ID read address must be specified. The maker code is output from address BK + 00; the device code is output from address BK + 01. From other banks data are output from the memory cells. Inputting a Reset command releases ID Read Mode and returns the device to Read Mode. Access time in ID Read Mode is the same as that in Read Mode. For a list of the codes, please refer to the ID Code Table. Standby Mode There are two ways to put the device into Standby Mode. (1) Control using CE and RESET With the device in Read Mode, input VDD ± 0.3 V to CE and RESET . The device will enter Standby Mode and the current will be reduced to the standby current (IDDS1). However, if the device is in the process of performing simultaneous operation, the device will not enter Standby Mode but will instead cause the operating current to flow. (2) Control using RESET only With the device in Read Mode, input VSS ± 0.3 V to RESET . The device will enter Standby Mode and the current will be reduced to the standby current (IDDS1). Even if the device is in the process of performing simultaneous operation, this method will terminate the current operation and set the device to Standby Mode. This is a hardware reset and is described later. In Standby Mode DQ is put in High-Impedance state. Auto-Sleep Mode This function suppresses power dissipation during reading. If the address input does not change for 150 ns, the device will automatically enter Sleep Mode and the current will be reduced to the standby current (IDDS2). However, if the device is in the process of performing simultaneous operation, the device will not enter Standby Mode but will instead cause the operating current to flow. Because the output data is latched, data is output in Sleep Mode. When the address is changed, Sleep Mode is automatically released, and data from the new address is output. Output Disable Mode Inputting VIH to OE disables output from the device and sets DQ to High-Impedance. |
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