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M36DR432-ZAT Datasheet(PDF) 11 Page - STMicroelectronics |
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M36DR432-ZAT Datasheet(HTML) 11 Page - STMicroelectronics |
11 / 46 page 11/46 M36DR432C, M36DR432D INSTRUCTIONS AND COMMANDS Seventeen instructions are defined (see Table 15), and the internal P/E.C. automatically handles all timing and verification of the Program and Erase operations. The Status Register Data Poll- ing, Toggle, Error bits can be read at any time, dur- ing programming or erase, to monitor the progress of the operation. Instructions, made up of one or more commands writtenincycles, can begiven to theProgram/ Erase Controller through a Command Interface (C.I.). The C.I. latches commands written to the memory. Commands are made of address and data sequences. Two Coded Cycles unlock the Command Interface. They are followed by an input command or a confirmation command. The Coded Sequence consists of writing the data AAh at the address 555h during the first cycle and the data 55h at the address 2AAh during the second cycle. Instructions are composed of up to six cycles. The first two cycles input a Coded Sequence to the Command Interface which is common to all in- structions (see Table 15). The third cycle inputs the instruction set-up command. Subsequent cy- cles output the addressed data, Electronic Signa- ture, Block Protection, Configuration Register Status or CFI Query for Read operations. In order to give additional data protection, the instructions for Block Erase and Bank Erase require further command inputs. For a Program instruction, the fourth command cycle inputs the address and data to be programmed. For a Double Word Program- ming instruction, the fourth and fifth command cy- cles input the address and data to be programmed. For a Block Erase and Bank Erase instructions, the fourth and fifth cycles input a fur- ther Coded Sequence before the Erase confirm command on the sixth cycle. Any combination of blocks of the same memory bank can be erased. Erasure of a memory block may be suspended, in order to read data from another block or to pro- gram data in another block, and then resumed. When power is first applied the command interface is reset to Read Array. Command sequencing must be followed exactly. Any invalid combination of commands will reset the device to Read Array. The increased number of cycles has been chosen to ensure maximum data security. Table 13. Commands Read/Reset (RD) Instruction. The Read/Reset instruction consists of one write cycle giving the command F0h. It can be optionally preceded by the two Coded Cycles. Subsequent read opera- tions will read the memory array addressed and output the data read. CFI Query (RCFI) Instruction. Common Flash Interface Query mode is entered writing 98h at ad- dress 55h. The CFI data structure gives informa- tion on the device, such as the sectorization, the command set and some electrical specifications. Table 18, 19, 20 and 21 show the addresses used to retrieve each data. The CFI data structure con- tains also a security area; in this section, a 64 bit unique security number is written, starting at ad- dress 80h. This area can be accessed only in read mode by the final user and there are no ways of changing the code after it has been written by ST. Write a read instruction (RD) to return to Read mode. Auto Select (AS) Instruction. This instruction uses two Coded Cycles followed by one write cycle giv- ing the command 90h to address 555h for com- mand set-up. A subsequent read will output the Manufacturer or the Device Code (Electronic Sig- nature), the Block Protection status or the Config- uration Register status depending on the levels of A0 and A1 (see Table 10, 11 and 12). A7-A2 must be at VIL, while other address input are ignored. Hex Code Command 00h Bypass Reset 10h Bank Erase Confirm 20h Unlock Bypass 30h Block Erase Resume/Confirm 40h Double Word Program 60h Block Protect, or Block Unprotect, or Block Lock, or Write Configuration Register 80h Set-up Erase 90h Read Electronic Signature, or Block Protection Status, or Configuration Register Status 98h CFI Query A0h Program B0h Erase Suspend F0h Read Array/Reset |
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