9–38
Chapter 9: Using User Flash Memory in MAX II Devices
Software Support for UFM Block
Figure 9–40.
Parallel Interface Timing Waveform
t
COMMAND
Command
t
HNBUSY
nBusy
t
HBUS
Data or Address Bus
Table 9–16.
Parallel Interface Timing Parameters
Symbol
t
COMMAND
Description
The time required for the command signal
(nREAD/nWRITE/nERASE) to be asserted and held low to initiate
a read/write/erase sequence
Maximum delay between command signal’s falling edge to the
nBUSY
signal’s falling edge
The time that data and/or address bus must be present at the data
input and/or address register port after the command signal has
been asserted low
Minimum (ns)
600
Maximum (ns)
3,000
t
HNBUSY
t
HBUS
—
600
300
—
Instantiating Parallel Interface Using Quartus II altufm Megafunction
shows the altufm megafunction symbol for a parallel interface
instantiation in the Quartus II software.
Figure 9–41.
altufm Megafunction Symbol for Parallel Interface Instantiation
shows page 3 of the altufm MegaWizard Plug-In Manager, selecting the
Parallel Interface as the interface. On this page, you can choose whether to implement
the Read/Write mode or Read Only mode for the UFM. You also have an option to
choose the width for address bus (up to 9 bits) and for the data bus (up to 16 bits). You
can specify the initial content of the UFM block on page 4 of the altufm MegaWizard
Plug-In Manager as discussed in
ALTERA [ ALTERA CORPORATION ]
