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Chapter 8: Configuration and Remote System Upgrades in Cyclone IV Devices
8–67
Configuration
May 2013
Altera Corporation
DATA[7..2]
I/O
FPP, AP
Inputs (FPP).
Bidirectional
In an AS or PS configuration scheme,
DATA[7..2]
function as user I/O pins during configuration, which
means they are tri-stated.
After FPP configuration,
DATA[7..2]
are available as user
I/O pins and the state of these pin depends on the
Dual-Purpose Pin
settings.
In an AP configuration scheme, for Cyclone IV E devices
only, the byte-wide or word-wide configuration data is
presented to the target Cyclone IV E device on
DATA[7..0]
or
DATA[15..0]
, respectively. After AP configuration,
DATA[7..2]
are dedicated bidirectional pins with optional
user control.
DATA[15..8]
I/O
Bidirectional
Data inputs. Word-wide configuration data is presented to
the target Cyclone IV E device on
DATA[15..0]
.
In a PS, FPP, or AS configuration scheme,
DATA[15:8]
function as user I/O pins during configuration, which
means they are tri stated.
After AP configuration,
DATA[15:8]
are dedicated
bidirectional pins with optional user control.
PADD[23..0]
I/O
Output
In AP mode, it is a 24-bit address bus from the Cyclone IV E
device to the parallel flash. Connects to the
A[24:1]
bus on
the Micron P30 or P33 flash.
nRESET
I/O
Output
Active-low reset output. Driving the
nRESET
pin low resets
the parallel flash. Connects to the
RST#
pin on the Micron
P30 or P33 flash.
nAVD
I/O
Output
Active-low address valid output. Driving the
nAVD
pin low
during read or write operation indicates to the parallel flash
that a valid address is present on the
PADD[23..0]
address
bus. Connects to the
ADV#
pin on the Micron P30 or P33
flash.
nOE
I/O
Output
Active-low output enable to the parallel flash. During the
read operation, driving the
nOE
pin low enables the parallel
flash outputs (
DATA[15..0]
). Connects to the
OE#
pin on
the Micron P30 or P33 flash.
nWE
I/O
Output
Active-low write enable to the parallel flash. During the
write operation, driving the
nWE
pin low indicates to the
parallel flash that data on the
DATA[15..0]
bus is valid.
Connects to the
WE#
pin on the Micron P30 or P33 flash.
:
(1) If you are accessing the EPCS device with the ALTASMI_PARALLEL megafunction or your own user logic in user mode, in the
Device and Pin
Options
window of the Quartus II software, in the
Dual-Purpose Pins
category, select
Use as regular I/O
for this pin.
(2) The AP configuration scheme is for Cyclone IV E devices only.
Table 8–20. Dedicated Configuration Pins on the Cyclone IV Device (Part 4 of 4)
Pin Name
User Mode
Configuration
Scheme
Pin Type
Description
Содержание Cyclone IV
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