M58LR128FT datasheet(14/82 Pages) STMICROELECTRONICS

14 / 82 page

M58LR128FT, M58LR128FB

14/82

■

The second latches the address and data to

be programmed and starts the Program/Erase

Controller.

Once the programming has started, read opera-

tions in the bank being programmed output the

Status Register content.

During a Program operation, the bank containing

the Word being programmed will only accept the

Read Array, Read Status Register, Read Electron-

ic Signature, Read CFI Query and the Program/

Erase Suspend command, all other commands

will be ignored. A Read Array command is re-

quired to return the bank to Read Array mode.

Refer to Dual Operations section for detailed infor-

mation about simultaneous operations allowed in

banks not being programmed.

Typical Program

times are given in Table

15., Program, Erase Times and Endurance Cy-

cles.

The Program operation aborts if Reset, RP, goes

to VIL. As data integrity cannot be guaranteed

when the Program operation is aborted, the Word

must be reprogrammed.

See APPENDIX C., Figure 22., Program Flow-

chart and Pseudo Code, for the flowchart for using

the Program command.

Buffer Program Command

The Buffer Program Command makes use of the

device’s 32-Word Write Buffer to speed up pro-

gramming. Up to 32 Words can be loaded into the

Write Buffer. The Buffer Program command dra-

matically reduces in-system programming time

compared to the standard non-buffered Program

command.

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.

After the first Bus Write cycle, read operations in

the bank will output the contents of the Status

to check that the buffer is available (SR7 = 1). If

the buffer is not available (SR7 = 0), re-issue the

Buffer Program command to update the Status

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.

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.

Optimum performance is obtained when the

start address corresponds to a 32 Word

boundary. If the start address is not aligned to

a 32 word boundary, the total programming

time is doubled

The final Bus Write cycle confirms the Buffer

Program command and starts the program

operation.

All the addresses used in the Buffer Program op-

eration must lie within the same block.

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 oper-

ation without affecting the data in the memory ar-

ray.

If the Status Register bits SR4 and SR5 are set to

'1', the Buffer Program Command is not accepted.

Clear the Status Register before re-issuing the

command.

If the block being programmed is protected an er-

ror will be set in the Status Register and the oper-

ation 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 infor-

mation about simultaneous operations allowed in

banks not being programmed.

See Appendix C, figure 27, Buffer Program Flow-

chart and Pseudo Code, for a suggested flowchart

on using the Buffer Program command.

Buffer Enhanced Factory Program Command

The Buffer Enhanced Factory Program command

has been specially developed to speed up pro-

gramming in manufacturing environments where

the programming time is critical.

It is used to program one or more Write Buffer(s)

of 32 Words to a block. Once the device enters

Buffer Enhanced Factory Program mode, the

Write Buffer can be reloaded any number of times

as long as the address remains within the same

block. Only one block can be programmed at a

time.

The use of the Buffer Enhanced Factory Program

command requires certain operating conditions:

■

VPP must be set to VPPH

■

VDD must be within operating range

■

Ambient temperature, TA must be 25°C ± 5°C

■

The targeted block must be unlocked

■

The start address must be aligned with the

start of a 32 Word buffer boundary

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