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HY29F002TC-45 Datasheet(PDF) 10 Page - Hynix Semiconductor |
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HY29F002TC-45 Datasheet(HTML) 10 Page - Hynix Semiconductor |
10 / 38 page 10 Rev. 4.1/May 01 HY29F002T Notes: 1. Any number of Flash array read cycles are permitted. 2. Additional data cycles may follow. See text. 3. Any number of Electronic ID read cycles are permitted. d n a m m o C e c n e u q e S s e l c y C s u B f o r e b m u N k c o l n U d n a m m o C a t a D 1 t e s e R / d a e R0 1 1 e t o N 2 t e s e R / d a e R2 1 1 e t o N m a r g o r P e t y B2 1 1 e s a r E p i h C4 1 1 e s a r E r o t c e S4 1 ) 2 e t o N ( 1 d n e p s u S e s a r E0 1 0 e m u s e R e s a r E0 1 0 D I c i n o r t c e l E2 1 3 e t o N Table 4. Composition of Command Sequences A Read/Reset command must be issued in order to read array data in the following cases: n If the device is in the Electronic ID mode, a Read/ Reset command must be written to re- turn to the Read mode. If the device was in the Erase Suspend mode when the device entered the Electronic ID mode, writing the Read/Re- set command returns the device to the Erase Suspend mode. Note: When in the Electronic ID bus operation mode, the device returns to the Read mode when V ID is re- moved from the A[9] pin. The Read/Reset command is not required in this case. n If DQ[5] (Exceeded Time Limit) goes High dur- ing a program or erase operation, writing the reset command returns the sectors to the Read mode (or to the Erase Suspend mode if the device was in Erase Suspend). The Read/Reset command may also be used to abort certain command sequences: n In a Sector Erase or Chip Erase command se- quence, the Read/Reset command may be written at any time before erasing actually be- gins, including, for the Sector Erase command, between the cycles that specify the sectors to be erased (see Sector Erase command de- scription). This aborts the command and re- sets the device to the Read mode. Once era- sure begins, however, the device ignores Read/ Reset commands until the operation is com- plete. n In a Program command sequence, the Read/ Reset command may be written between the sequence cycles before programming actually begins. This aborts the command and resets the device to the Read mode, or to the Erase Suspend mode if the Program command se- quence is written while the device is in the Erase Suspend mode. Once programming begins, however, the device ignores Read/Re- set commands until the operation is complete. n The Read/Reset command may be written be- tween the cycles in an Electronic ID command sequence to abort that command. As described above, once in the Electronic ID mode, the Read/ Reset command must be written to re- turn to the Read mode. Byte Program Command The host processor programs the device a byte at a time by issuing the Program command sequence shown in Table 5. The sequence begins by writ- ing two unlock cycles, followed by the Program setup command and, lastly, a data cycle specify- ing the program address and data. This initiates the Automatic Programming algorithm, which pro- vides internally generated program pulses and verifies the programmed cell margin. The host is not required to provide further controls or timings during this operation. When the Automatic Pro- gramming algorithm is complete, the device re- turns to the Read mode. Several methods are provided to allow the host to determine the status of the programming operation, as described in the Write Operation Status section. Commands written to the device during execution of the Automatic Programming algorithm are ig- nored. Note that a hardware reset immediately terminates the programming operation. To en- sure data integrity, the aborted program command sequence should be reinitiated once the reset operation is complete. Programming is allowed in any sequence. Only erase operations can convert a stored “0” to a “1”. Thus, a bit cannot be programmed from a “0” back to a “1”. Attempting to do so will set DQ[5] to “1”, and the Data# Polling algorithm will indicate that the operation was not successful. A Read/Reset command or a hardware reset is required to exit |
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