mx25l3237d Macronix International Co., mx25l3237d Datasheet - Page 21

• Manufacturer Part Number: mx25l3237d
• Description: Serial Flash Memory
• Manufacturer: Macronix International Co.

MX25L3237D
The self-timed Block Erase Cycle time (tBE) is initiated as soon as Chip Select (CS#) goes high. The Write in Progress
(WIP) bit still can be check out during the Sector Erase cycle is in progress. The WIP sets 1 during the tBE timing, and
sets 0 when Sector Erase Cycle is completed, and the Write Enable Latch (WEL) bit is reset. If the page is protected by
BP3, BP2, BP1, BP0 bits, the Block Erase (BE) instruction will not be executed on the page.
(12) Chip Erase (CE)
The Chip Erase (CE) instruction is for erasing the data of the whole chip to be "1". A Write Enable (WREN) instruction must
execute to set the Write Enable Latch (WEL) bit before sending the Chip Erase (CE). The CS# must go high exactly at
the byte boundary( the latest eighth of address byte been latched-in); otherwise, the instruction will be rejected and not
executed.
The sequence of issuing CE instruction is: CS# goes low-> sending CE instruction code-> CS# goes high. (see Figure
24)
The self-timed Chip Erase Cycle time (tCE) is initiated as soon as Chip Select (CS#) goes high. The Write in Progress
(WIP) bit still can be check out during the Chip Erase cycle is in progress. The WIP sets 1 during the tCE timing, and
sets 0 when Chip Erase Cycle is completed, and the Write Enable Latch (WEL) bit is reset. If the chip is protected by BP3,
BP2, BP1, BP0 bits, the Chip Erase (CE) instruction will not be executed. It will be only executed when BP3, BP2, BP1,
BP0 all set to "0".
(13) Page Program (PP)
The Page Program (PP) instruction is for programming the memory to be "0". A Write Enable (WREN) instruction must
execute to set the Write Enable Latch (WEL) bit before sending the Page Program (PP). The device programs only the
last 256 data bytes sent to the device. If the entire 256 data bytes are going to be programmed, A7-A0 (The eight least
significant address bits) should be set to 0. If the eight least significant address bits (A7-A0) are not all 0, all transmitted
data going beyond the end of the current page are programmed from the start address of the same page (from the address
A7-A0 are all 0). If more than 256 bytes are sent to the device, the data of the last 256-byte is programmed at the request
page and previous data will be disregarded. If less than 256 bytes are sent to the device, the data is programmed at the
requested address of the page without effect on other address of the same page.
The sequence of issuing PP instruction is: CS# goes low-> sending PP instruction code-> 3-byte address on SI-> at least
1-byte on data on SI-> CS# goes high. (see Figure 19)
The CS# must be kept to low during the whole Page Program cycle; The CS# must go high exactly at the byte boundary(
the latest eighth bit of data being latched in), otherwise the instruction will be rejected and will not be executed.
The self-timed Page Program Cycle time (tPP) is initiated as soon as Chip Select (CS#) goes high. The Write in Progress
(WIP) bit still can be check out during the Page Program cycle is in progress. The WIP sets 1 during the tPP timing, and
sets 0 when Page Program Cycle is completed, and the Write Enable Latch (WEL) bit is reset. If the page is protected
by BP3, BP2, BP1, BP0 bits, the Page Program (PP) instruction will not be executed.
P/N: PM1393
REV. 0.02, JUN. 13, 2008
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