MX25L1635D Macronix International, MX25L1635D Datasheet - Page 22

• Manufacturer Part Number: MX25L1635D
• Description: 16M-BIT [x 1/x 2/x 4] CMOS SERIAL FLASH
• Manufacturer: Macronix International

MX25L1635D
Deep Power-down (DP) instruction to enter, during the Deep Power-down mode, the device is not active and all Write/
Program/Erase instruction are ignored. When CS# goes high, it's only in standby mode not deep power-down mode. It's
different from Standby mode.
The sequence of issuing DP instruction is: CS# goes low-> sending DP instruction code-> CS# goes high. (see Figure
25)
Once the DP instruction is set, all instruction will be ignored except the Release from Deep Power-down mode (RDP) and
Read Electronic Signature (RES) instruction. (those instructions allow the ID being reading out). When Power-down, the
deep power-down mode automatically stops, and when power-up, the device automatically is in standby mode. For RDP
instruction the CS# must go high exactly at the byte boundary (the latest eighth bit of instruction code been latched-in);
otherwise, the instruction will not executed. As soon as Chip Select (CS#) goes high, a delay of tDP is required before
entering the Deep Power-down mode.
(17) Release from Deep Power-down (RDP), Read Electronic Signature (RES)
The Release from Deep Power-down (RDP) instruction is terminated by driving Chip Select (CS#) High. When Chip Select
(CS#) is driven High, the device is put in the Stand-by Power mode. If the device was not previously in the Deep Power-
down mode, the transition to the Stand-by Power mode is immediate. If the device was previously in the Deep Power-down
mode, though, the transition to the Stand-by Power mode is delayed by tRES2, and Chip Select (CS#) must remain High
for at least tRES2(max), as specified in Table 10.AC Characteristics. Once in the Stand-by Power mode, the device waits
to be selected, so that it can receive, decode and execute instructions. The RDP instruction is only for releasing from Deep
Power Down Mode.
RES instruction is for reading out the old style of 8-bit Electronic Signature, whose values are shown as table of ID
Definitions in next page. This is not the same as RDID instruction. It is not recommended to use for new design. For new
design, please use RDID instruction.
The sequence is shown as Figure 26,27. Even in Deep power-down mode, the RDP and RES are also allowed to be
executed, only except the device is in progress of program/erase/write cycle; there's no effect on the current program/
erase/write cycle in progress.
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The RES instruction is ended by CS# goes high after the ID been read out at least once. The ID outputs repeatedly if
continuously send the additional clock cycles on SCLK while CS# is at low. If the device was not previously in Deep Power-
down mode, the device transition to standby mode is immediate. If the device was previously in Deep Power-down mode,
there's a delay of tRES2 to transit to standby mode, and CS# must remain to high at least tRES2(max). Once in the standby
mode, the device waits to be selected, so it can be receive, decode, and execute instruction.
(18) Read Electronic Manufacturer ID & Device ID (REMS), (REMS2), (REMS4)
The REMS, REMS2 & REMS4 instruction is an alternative to the Release from Power-down/Device ID instruction that
provides both the JEDEC assigned manufacturer ID and the specific device ID. The REMS4 instruction is recommended
to use for 4 I/O identification and REMS2 instruction is recommended to use for 2 I/O identification.
The REMS, REMS2 & REMS4 instruction is very similar to the Release from Power-down/Device ID instruction. The
instruction is initiated by driving the CS# pin low and shift the instruction code "90h" or "EFh" or "DFh"followed by two
dummy bytes and one bytes address (A7~A0). After which, the Manufacturer ID for MXIC (C2h) and the Device ID are
shifted out on the falling edge of SCLK with most significant bit (MSB) first as shown in figure 31. The Device ID values
are listed in Table 7 of ID Definitions in next page. If the one-byte address is initially set to 01h, then the device ID will
be read first and then followed by the Manufacturer ID. The Manufacturer and Device IDs can be read continuously,
alternating from one to the other. The instruction is completed by driving CS# high.
P/N: PM1374
REV. 1.5, OCT. 01, 2008
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