NAND08GAH0A NUMONYX [Numonyx B.V], NAND08GAH0A Datasheet - Page 36

• Manufacturer Part Number: NAND08GAH0A
• Manufacturer: NUMONYX [Numonyx B.V]

High speed MultiMediaCard operation
5.3.10
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CSD or CID register is stored in ROM it will not be overwritten and the device does not
check the ROM data with the content of the received buffer.
Some devices may require a long time (1 s max) to write a block of data. After receiving a
block of data and completing the CRC check, the device begins writing and hold DAT Low if
its write buffer is full and unable to accept new data from a new Block Write command. The
host may poll the status of the device with a SEND_STATUS command at any time, and the
device responds with its status. The status bit READY_FOR_DATA indicates whether the
device can accept new data or whether the write process is still in progress. The host may
deselect the device by issuing CMD7 (to select a different device) which will place the device
in the Disconnect state and release the DAT line without interrupting the write operation.
When re-selecting the device, it will reactivate the busy indication by pulling DAT to Low if
programming is still in progress and the write buffer is unavailable. If a block write operation
is stopped and the block length and CRC of the last block are valid, the data will be
programmed.
Group Erase
The device supports Group Erase. The size of the Erase Group is defined in the CSD
register. To select an Erase Group, a first command with the starting address is followed by
a second command with the final address. After a range is selected, the erase operation is
performed by issuing an ERASE command (CMD38).
The address field in the CMD35/CMD36/CMD38 commands is the group address in units of
bytes. The device will ignore all LSBs below the group size.
The host must adhere to the following command sequence:
●
●
●
If an CMD35/CMD36/CMD38 command is received out of sequence the device sets the
ERASE_SEQ_ERROR error bit in the Status Register and reset the whole sequence.
If the host provides an out of range address as an argument of the CMD35 or CMD36
command, the device rejects the command, returns the ADDRESS_OUT_OF_RANGE error
set, and resets the whole erase sequence.
If an non-erase command is received (different form CMD35, CMD36, CMD38 or CMD13),
the device returns the ERASE_RESET error, resets the erase sequence and executes the
last command.
Commands not addressed to the selected card do not abort the erase sequence.
If the erase group includes write protected blocks, only unprotected blocks are erased. In
this case, the WP_ERASE_SKIP status bit of the Status Register is set.
The device indicates that an erase operation is in progress by holding DAT to Low.
ERASE_GROUP_START (CMD35)
ERASE_GROUP_END (CMD36)
ERASE (CMD38)
NAND08GAH0A, NAND16GAH0D