M58PR256J datasheet(25/114 Pages) STMICROELECTRONICS

25 / 114 page

M58PR256J, M58PR512J

Command interface

25/114

4.8

Buffer Program command

The Buffer Program Command makes use of the device’s 1 KByte Write Buffer to speed up

programming. Up to 1 KByte can be loaded into the Write Buffer and programmed into the

specified 1KB aligned location in the main array. The Buffer Program command dramatically

reduces in-system programming time compared to the standard non-buffered Program

command.

The Buffer Program command is supported in both the Object Program mode and the

Control Program mode.

When using the Buffer Program command in a region configured in Object mode, the start

programming address must be aligned to the 1KB buffer.

When using the Buffer Program command in a region configured in the Control Program

mode, the programmed address must be within the ’A’ Segment halves of the Program

Region (addresses with A3 = 0) and the ’B’ Segment halves of the Program Region

(addresses with A3 = 1) must be filled only with FFFFh data.

Before issuing the Buffer Program Setup command, the status register bit SR7 at bank

address should be read to ensure that the buffer is available (SR7=1).

Four successive steps are required to issue the Buffer Program command:

The first Bus Write cycle sets up the Buffer Program command. The setup code can be

addressed to any location within the targeted Block.

The second Bus Write cycle sets up the number of Words to be programmed. Value n

is written to the same Block address, where n+1 is the number of Words to be

programmed. The maximum buffer count is 1FF (512 Words).

Use n+1 Bus Write cycles to load the address and data for each Word into the Write

Buffer. Addresses must lie within the range from the start address to the start address +

n, where the start address is the location of the first data to be programmed. The start

address must be aligned to a 1 KB boundary.

The final Bus Write cycle confirms the Buffer Program command and starts the

program operation.

All the addresses used in the Buffer Program operation must lie within the same Block.

The Buffer Program operation does not change the Read Status of the banks until the Buffer

Program Confirm Command is issued. The Buffer Program Confirm Command change the

Read Status of the Bank to Read Status Register so after Buffer Program Confirm

Command, read operations in the bank will output the contents of the Status Register.

Invalid address combinations or failing to follow the correct sequence of Bus Write cycles

will set an error in the Status Register and abort the operation without affecting the data in

the memory array.

If the Block being programmed is protected an error will be set in the Status Register and

the operation will abort without affecting the data in the memory array.

During Buffer Program operations the bank being programmed will only accept the Read

Array, Read Status Register, Read Electronic Signature, Read CFI Query and the

Program/Erase Suspend command, all other commands will be ignored.

Refer to Dual Operations section for detailed information about simultaneous operations

allowed in banks not being programmed.

See Appendix C, Figure 21: Buffer Program flowchart and pseudo code, for a suggested

flowchart on using the Buffer Program command.

M58PR256J Datasheet(PDF) 25 Page - STMicroelectronics

M58PR256J Datasheet(HTML) 25 Page - STMicroelectronics

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 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Descarga

Enlace URL