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
tCOMMAND
Description
Minimum (ns)
Maximum (ns)
The time required for the command signal
(nREAD/nWRITE/nERASE) to be asserted and held low to initiate
600
3,000
a read/write/erase sequence
tHNBUSY
tHBUS
Maximum delay between command signal’s falling edge to the
nBUSYsignal’s falling edge
—
300
—
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
600
Instantiating Parallel Interface Using Quartus II altufm Megafunction
Figure 9–41 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
Figure 9–42 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 “Creating Memory Content File” on page 9–40.
MAX II Device Handbook
© October 2008 Altera Corporation
ALTERA [ ALTERA CORPORATION ]
