MX25L6445E
(17) Page Program (PP)
The Page Program (PP) instruction is for programming the memory to be "0". A Write Enable (WREN) instruction
must be executed 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 requested 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. (Please refer to Figure 28)
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 checked while the Page Program cycle is in progress. The WIP sets during the tPP
timing, and clears when Page Program Cycle is completed, and the Write Enable Latch (WEL) bit is cleared. If
the page is protected by BP3~0 (WPSEL=0) or by individual lock (WPSEL=1), the array data will be protected (no
change) and the WEL bit will still be reset.
(18) 4 x I/O Page Program (4PP)
The Quad Page Program (4PP) instruction is for programming the memory to be "0". A Write Enable (WREN)
instruction must be executed to set the Write Enable Latch (WEL) bit and Quad Enable (QE) bit must be set to "1"
before sending the Quad Page Program (4PP). The Quad Page Programming takes four pins: SIO0, SIO1, SIO2,
and SIO3, which can raise programer performance and and the effectiveness of application of lower clock less
than 20MHz. For system with faster clock, the Quad page program cannot provide more performance, because
the required internal page program time is far more than the time data flows in. Therefore, we suggest that while
executing this command (especially during sending data), user can slow the clock speed down to 20MHz below.
The other function descriptions are as same as standard page program.
The sequence of issuing 4PP instruction is: CS# goes low→ sending 4PP instruction code→ 3-byte address on
SIO[3:0]→ at least 1-byte on data on SIO[3:0]→ CS# goes high. (Please refer to Figure 29)
If the page is protected by BP3~0 (WPSEL=0) or by individual lock (WPSEL=1), the array data will be protected (no
change) and the WEL bit will still be reset.
P/N: PM1736
REV. 1.8, DEC. 26, 2011
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