NAND08GAH0A NUMONYX [Numonyx B.V], NAND08GAH0A Datasheet - Page 83

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

NAND08GAH0A, NAND16GAH0D
10
10.1
10.2
Serial peripheral interface (SPI) mode
The SPI mode is an optional communications protocol in Flash based MultiMediaCards. It is
used to communicate with a microcontroller (host) through an SPI channel.
On power-up the MultiMediaCard defaults to the MultiMediaCard mode. The SPI mode is
selected by asserting the CS signal during a reset command (CMD0). This may be after
power-up but also anytime a reset command is issued. On entering the SPI mode, the
device returns the SPI mode R1 response. Once the MultiMediaCard enters SPI mode it
remains in this mode until the next power-up.
To run, the SPI mode implements a subset of the MultiMediaCard protocol and commands.
This mode is intended for systems which require multiple devices, generally one, to operate,
and have lower data transfer rates compared to MultiMediaCard protocol based systems.
The serial peripheral interface is a general purpose, synchronous interface designed to
communicate with SPI hosts through four lines:
●
●
●
●
SPI bus topology
The host (master) selects a device (slave) by driving its CS pin Low. The CS pin must then
be kept Low during the entire SPI communication process (command, response and data).
During device programming, however, the host can de-assert the CS signal without affecting
the programming operation.
Single block and multiple read and write operations are supported by the SPI channel as
DataIn and DataOut are unidirectional.
Table 62
In SPI mode only the OCR, CSD and CID registers are accessible (see
SPI electrical interface
The electrical interface in SPI mode is the same as the MultiMediaCard mode, except for the
programmable device output drivers option which is not available in SPI mode.
CS: host to device Chip Select line
CLK: host to device clock line
DataIn, DI: unidirectional host to device data line
DataOut, DO: unidirectional device to host data line.
shows the MultiMediaCard pin assignment in SPI mode.
Serial peripheral interface (SPI) mode
Table
63).
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