M28W640HCT datasheet(20/72 Pages) NUMONYX

20 / 72 page

Command interface

M28W640HCT, M28W640HCB

20/72

4.11

Program/Erase Resume command

The Program/Erase Resume command can be used to restart the Program/Erase controller

after a program/erase suspend operation has paused it. One Bus Write cycle is required to

issue the command. Once the command is issued subsequent bus read operations read the

Status Register.

See Appendix C, Figure 18: Program Suspend & Resume flowchart and pseudocode, and

Figure 20: Erase Suspend & Resume flowchart and pseudocode, for flowcharts for using

the Program/Erase Resume command.

4.12

Protection Register Program command

The Protection Register Program command is used to program the 128 bit user one-time-

programmable (OTP) segment of the Protection Register. The segment is programmed 16

bits at a time. When shipped all bits in the segment are set to ‘1’. The user can only program

the bits to ‘0’.

Two write cycles are required to issue the Protection Register Program command:

●

The first bus cycle sets up the Protection Register Program command

●

The second latches the address and the data to be written to the Protection Register

and starts the Program/Erase controller.

Read operations output the Status Register content after the programming has started.

The segment can be protected by programming bit 1 of the Protection Lock Register (see

Figure 5: Protection register memory map). Attempting to program a previously protected

Protection Register will result in a Status Register error. The protection of the Protection

The Protection Register Program cannot be suspended.

4.13

Block Lock command

The Block Lock command is used to lock a block and prevent program or erase operations

from changing the data in it. All blocks are locked at power-up or reset.

Two Bus Write cycles are required to issue the Block Lock command:

●

The first bus cycle sets up the Block Lock command

●

The second Bus Write cycle latches the block address.

The lock status can be monitored for each block using the Read Electronic Signature

command. Table 10 shows the protection status after issuing a Block Lock command.

The Block Lock bits are volatile, once set they remain set until a hardware reset or power-

down/power-up. They are cleared by a Blocks Unlock command. Refer to the section, Block

Locking, for a detailed explanation.

M28W640HCT Datasheet(PDF) 20 Page - Numonyx B.V

M28W640HCT Datasheet(HTML) 20 Page - Numonyx B.V

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72

Datasheet Download

Link URL