kfm2g16q2m-deb8 Samsung Semiconductor, Inc., kfm2g16q2m-deb8 Datasheet - Page 137

• Manufacturer Part Number: kfm2g16q2m-deb8
• Description: 2gb Muxonenand M-die
• Manufacturer: Samsung Semiconductor, Inc.

MuxOneNAND2G(KFM2G16Q2M-DEBx)
MuxOneNAND4G(KFN4G16Q2M-DEBx)
FLASH MEMORY
MuxOneNAND8G(KFK8G16Q2M-DEBx)
3.16
DQ6 Toggle Bit
The MuxOneNAND device has DQ6 Toggle bit. Toggle bit is another option to detect whether an internal load operation is in progress
or completed. Once the BufferRAM(BootRAM, DataRAM0, DataRAM1) is at a busy state during internal load operation, DQ6 will tog-
gle. Toggling DQ6 will stop after the device completes its internal load operation. The MuxOneNAND device’s DQ6 Toggle will be
valid only when host reads BufferRAM designated by BSA which will be loaded by internal load operation. DQ6 toggle can be used
350ns after load command(0000h and 0013h of Command based Operation) issue, until data sensing from the NAND Flash Array
memory into Page Buffer and transferring from the Page Buffer to the DataRAM are finished. By reading the same address more than
twice utilizing either asynchronous or synchronous read (Figure 6.22, 6.23 and 6.24), the host will read toggled value of DQ6 and the
rest of DQ’s are not guaranteed to be fixed value. DQ6 toggle is only for reading status of BufferRAM which is being loaded by inter-
nal operation, that is, BufferRAM designated by BSA. Host may read previous data from BufferRAM not pointed by BSA during inter-
nal load operation.
DQ6 toggle bit can be useful at Cold Reset to determine the ready/busy state of MuxOneNAND. Since INT pin is initially at High-Z
state, when host needs to check the completion of bootcode copy operation, the host cannot judge the ready/busy status of Mux-
OneNAND by INT pin. Therefore, by checking DQ6 toggle of BootRAM, the host should detect the completion of bootcode copy.
Note that DQ6 toggle bit is not valid at Cache Read and Synchronous Burst Block Read.
Status
DQ15~DQ7
DQ6
DQ5~DQ0
In Progress
Data Loading
X (Don’t Care)
Toggle
X (Don’t Care)
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