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M59DR032EA Datasheet(PDF) 11 Page - STMicroelectronics |
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M59DR032EA Datasheet(HTML) 11 Page - STMicroelectronics |
11 / 43 page 11/43 M59DR032EA, M59DR032EB programming throughput by writing a page of four adjacent Words in parallel. The four Words must differ only for the addresses A0 and A1. The VPP supply voltage is required to be from 11.4V to 12.6V for the Quadruple Word Program com- mand. The command uses the two unlock cycles followed by a write cycle to set up the command. A further four cycles are required to latch the address and data of the four Words and start the Program Erase Controller. The Quadruple Word Program command can be executed in Bypass mode to skip the two unlock cycles. Note that the Quadruple Word Program command cannot change a bit set to ’0’ back to ’1’. One of the Erase Commands must be used to set all the bits in a block or in the whole bank from ’0’ to ’1’. If the Quadruple Word Program command is used to try to set a bit from ‘0’ to ‘1’ Status Register Error bit DQ5 will be set to ‘1’. Enter Bypass Mode Command. The Bypass mode is used to reduce the overall programming time when large memory arrays need to be pro- grammed. The Enter Bypass Mode command uses the two unlock cycles followed by one write cycle to set up the command. Once in Bypass mode, it is impera- tive that only the following commands be issued: Exit Bypass, Program, Double Word Program or Quadruple Word Program. Exit Bypass Mode Command. The Exit Bypass Mode command uses two write cycles to be set up and confirmed. The unlock cycles are not required. After the Exit Bypass Mode command, the device resets to Read mode. Program in Bypass Mode Command. The Program in Bypass Mode command can be is- sued when the device is in Bypass mode (issue an Enter Bypass Mode command). It uses the same sequence of cycles as the Program command with the exception of the unlock cycles. Double Word Program in Bypass Mode Com- mand. The Double Word Program in Bypass Mode command can be issued when the device is in Bypass mode (issue an Enter Bypass Mode command). It uses the same sequence of cycles as the Double Word Program command with the exception of the unlock cycles. Quadruple Word Program in Bypass Mode Command. The Quadruple Word Program in By- pass Mode command can be issued when the de- vice is in Bypass mode (issue an Enter Bypass Mode command). It uses the same sequence of cycles as the Quadruple Word Program command with the exception of the unlock cycles. Block Lock Command. The Block Lock com- mand 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. Three Bus Write cycles are required to issue the Block Lock command. s The first two bus cycles unlock the Command Interface. s The third bus cycle sets up the Block Lock command and latches the block address. The lock status can be monitored for each block using the Auto Select command. Table 10 shows the Lock Status after issuing a Block Lock com- mand. The Block Lock bits are volatile, once set they re- main set until a hardware Reset or Power-Down/ Power-Up. They are cleared by a Block Unlock command. Refer to the section, Block Locking, for a detailed explanation. Block Unlock Command. The Block Unlock command is used to unlock a block, allowing the block to be programmed or erased. Three Bus Write cycles are required to issue the Block Unlock command. s The first two bus cycles unlock the Command Interface. s The third bus cycle sets up the Block UnLock command and latches the block address. The lock status can be monitored for each block using the Auto Select command. Table 10 shows the lock status after issuing a Block Unlock com- mand. Refer to the section, Block Locking, for a detailed explanation. Block Lock-Down Command. A locked or un- locked block can be locked-down by issuing the Block Lock-Down command. A locked-down block cannot be programmed or erased, or have its pro- tection status changed when WP is low, VIL. When WP is high, VIH, the Lock-Down function is dis- abled and the locked blocks can be individually un- locked by the Block Unlock command. Three Bus Write cycles are required to issue the Block Lock-Down command. s The first two bus cycles unlock the Command Interface. s The third bus cycle sets up the Block Lock- Down command and latches the block address. The lock status can be monitored for each block using the Auto Select command. Locked-Down blocks revert to the locked (and not locked-down) state when the device is reset on power-down. Ta- ble 10 shows the Lock Status after issuing a Block Lock-Down command. Refer to the section, Block Locking, for a detailed explanation. |
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