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M27W032-110M1T Folha de dados(PDF) 9 Page - STMicroelectronics |
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M27W032-110M1T Folha de dados(HTML) 9 Page - STMicroelectronics |
9 / 23 page 9/23 M27W032 Start Address), that indicates to the PC that the Program Phase has to continue. A0 to A16 are ‘don’t care’. 3. Finally, after all Words have been programmed, a Bus Write operation (the (n+1)th) with a Final Address, FA (A17 or a higher address pin different from the Start Address), ends the Program Phase. The memory is now set to enter the Verify Phase. Verify Phase. The Verify Phase is similar to the Program Phase in that all Words must be resent to the memory for them to be checked against the programmed data. Before any Bus Write Operation of the Verify Phase, the Status Register must be read in order to check that the PC is ready for the next operation or if the reprogram of the location has failed (see Table 6 and Figure 6). Three successive steps are required to execute the Verify Phase of the command: 1. The first Bus Write operation of the Verify Phase latches the Start Address and the Word to be verified. 2. Each subsequent Bus Write operation latches the next Word to be verified and automatically increments the internal Address Bus. As in the Program Phase, it is not necessary to provide the address of the location to be programmed but only a Continue Address, CA (A17 to A20 equal to the Start Address). 3. Finally, after all Words have been verified, a Bus Write cycle with a Final Address, FA (A17 or a higher address pin different from the Start Address) ends the Verify Phase. Exit Phase. After the Verify Phase ends, the Sta- tus Register must be read to check if the command has successfully completed or not (see Table 6 and Figure 6). If the Verify Phase is successful, the memory re- turns to Read mode and DQ6 stops toggling. If the PC fails to reprogram a given location, the Verify Phase terminates, DQ6 continues toggling and error bit DQ5 is set in the Status Register. If the error is due to a VPP failure DQ4 is also set. When the operation fails a Read/Reset command must be issued to return the device to Read mode. During the Multiple Word Program operation the memory will ignore all commands. It is not possible to issue any command to abort or pause the oper- ation. Typical program times are given in Table 5. Bus Read operations during the program opera- tion will output the Status Register on the Data In- puts/Outputs. See the section on the Status Register for more details. Note that the Multiple Word Program command cannot change a bit set to ’0’ back to ’1’. |
Nº de peça semelhante - M27W032-110M1T |
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Descrição semelhante - M27W032-110M1T |
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