Chapter 7: User Flash Memory in MAX V Devices
7–23
Software Support for UFM Block
Instantiating the I2C Interface Using the Quartus II ALTUFM_I2C
Megafunction
Figure 7–19 shows the ALTUFM_I2C megafunction symbol for a I2C interface
instantiation in the Quartus II software.
Figure 7–19. ALTUFM_I2C Megafunction Symbol for the I2C Interface Instantiation in the Quartus
II Software
ALTUFM_I2C megafunction is under the Memory Compiler folder on page 2a of the
MegaWizard Plug-In Manager. On page 3, you can choose whether to implement the
Read/Write or Read Only mode for the UFM. You also have an option to choose the
memory size for the ALTUFM_I2C megafunction as well as defining the four MSBs of
the slave address (default 1010).
You can select the optional write protection and erase operation methods on page 4 of
the ALTUFM MegaWizard Plug-In Manager.
1
The UFM block’s internal oscillator is always running when the ALTUFM_I2C
megafunction is instantiated for both read-only and read/write interfaces.
Serial Peripheral Interface
Serial peripheral interface (SPI) is a four-pin serial communication subsystem
included on the Motorola 6805 and 68HC11 series microcontrollers. It allows the
microcontroller unit to communicate with peripheral devices, and is also capable of
inter-processor communications in a multiple-master system.
The SPI bus consists of masters and slaves. The master device initiates and controls
the data transfers and provides the clock signal for synchronization. The slave device
responds to the data transfer request from the master device. The master device in an
SPI bus initiates a service request with the slave devices responding to the service
request.
With the ALTUFM megafunction, the UFM and MAX V logic can be configured as a
slave device for the SPI bus. The OSC_ENAis always asserted to enable the internal
oscillator when the SPI megafunction is instantiated for both read only and
read/write interfaces.
January 2011 Altera Corporation
MAX V Device Handbook
ALTERA [ ALTERA CORPORATION ]
