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MX25L3205MI-20G Datasheet(PDF) 11 Page - Macronix International |
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MX25L3205MI-20G Datasheet(HTML) 11 Page - Macronix International |
11 / 45 page 11 P/N: PM1169 REV. 1.0, JUL. 15, 2005 MX25L3205 (4) Read Status Register (RDSR) The RDSR instruction is for reading Status Register Bits. The Read Status Register can be read at any time (even in program/erase/write status register condition) and continuously. It is recommended to check the Write in Progress (WIP) bit before sending a new instruction when a program, erase, or write status register operation is in progress. The sequence of issuing RDSR instruction is: CS# goes low-> sending RDSR instruction code-> Status Register data out on SO (see Figure. 15) The definition of the status register bits is as below: WIP bit. The Write in Progress (WIP) bit, a volatile bit, indicates whether the device is busy in program/erase/write status register progress. When WIP bit sets to 1, which means the device is busy in program/erase/write status register progress. When WIP bit sets to 0, which means the device is not in progress of program/erase/write status register cycle. WEL bit. The Write Enable Latch (WEL) bit, a volatile bit, indicates whether the device is set to internal write enable latch. When WEL bit sets to 1, which means the internal write enable latch is set, the device can accept program/erase/write status register instruction. When WEL bit sets to 0, which means no internal write enable latch; the device will not accept program/erase/write status register instruction. BP2, BP1, BP0 bits. The Block Protect (BP2, BP1, BP0) bits, non-volatile bits, indicate the protected area(as defined in table 1) of the device to against the program/erase instruction without hardware protection mode being set. To write the Block Protect (BP2, BP1, BP0) bits requires the Write Status Register (WRSR) instruction to be executed. Those bits define the protected area of the memory to against Page Program (PP), Sector Erase (SE), and Chip Erase(CE) instructions (only if all Block Protect bits set to 0, the CE instruction can be executed) Program/erase error bit. When the program/erase bit set to 1, there is an error occurred in last program/erase operation. The Flash may accept a new program/erase command to re-do program/erase operation. SRWD bit. The Status Register Write Disable (SRWD) bit, non-volatile bit, is operated together with Write Protection (WP#) pin for providing hardware protection mode. The hardware protection mode requires SRWD sets to 1 and WP# pin signal is low stage. In the hardware protection mode, the Write Status Register (WRSR) instruction is no longer accepted for execution and the SRWD bit and Block Protect bits (BP2, BP1, BP0) are read only. bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 SRWD BP2 BP1 BP0 WEL WIP Status Program/ 0 the level of the level of the level of (write enable (write in progress Register Write erase protected protected protected latch) bit) Protect error block block block 1= status (note 1) (note 1) (note 1) 1=write enable 1=write operation register write 1=error 0=not write 0=not in write disable enable operation Note: 1. see the table "Protected Area Sizes" |
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