Chapter 9: Configuration, Design Security, and Remote System Upgrades in the Cyclone III Device Family
Configuration Features
9–47
FPP Configuration Timing
shows the timing waveform for FPP configuration when using an
external host.
Figure 9–23. FPP Configuration Timing Waveform
t
CF2ST1
t
CFG
nCONFIG
nSTATUS
(2)
CONF_DONE
(3)
t
CF2CD
t
CF2CK
t
STATUS
t
CF2ST0
t
t
ST2CK
CLK
t
CH
t
CL
DCLK
t
DH
(4)
Byte 2
Byte 3
Byte
n-1
DATA[7..0]
Byte 0
Byte 1
Byte
n
(5)
User Mode
User Mode
t
DSU
User I/O Tri-stated
with
internal pull-up resistor
INIT_DONE
t
CD2UM
Notes to
(1) The beginning of this waveform shows the device in user mode. In user mode,
nCONFIG, nSTATUS,
and
CONF_DONE
are at logic-high levels. When
nCONFIG
is pulled low, a reconfiguration cycle begins.
(2) After power-up, the Cyclone III device family holds
nSTATUS
low during POR delay.
(3) After power-up, before and during configuration,
CONF_DONE
is low.
(4) Do not leave
DCLK
floating after configuration. It must be driven high or low, whichever is more convenient.
(5)
DATA[7..0]
is available as user I/O pin after configuration; the state of the pin depends on the dual-purpose pin
settings.
lists the FPP configuration timing parameters for Cyclone III device family.
Table 9–14. FPP Timing Parameters for Cyclone III Device Family
Symbol
t
CF2CD
t
CF2ST0
t
CFG
t
STATUS
t
CF2ST1
t
CF2CK
t
ST2CK
t
DSU
t
DH
t
CH
t
CL
t
CLK
f
MAX
t
CD2UM
Parameter
nCONFIG
low to
CONF_DONE
low
nCONFIG
low to
nSTATUS
low
nCONFIG
low pulse width
nSTATUS
low pulse width
nCONFIG
high to
nSTATUS
high
nCONFIG
high to first rising edge on
DCLK
nSTATUS
high to first rising edge of
DCLK
DATA
setup time before rising edge on
DCLK
DATA
hold time after rising edge on
DCLK
DCLK
high time
DCLK
low time
DCLK
period
DCLK
frequency
CONF_DONE
high to user mode
(Part 1 of 2)
Minimum
—
—
500
45
—
230
2
5
0
3.2
3.2
7.5
—
300
Maximum
500
500
—
230
230
—
—
—
—
—
—
—
100
Unit
ns
ns
ns
s
s
s
s
ns
ns
ns
ns
ns
MHz
s
650
August 2012
Altera Corporation
Cyclone III Device Handbook
Volume 1
ALTERA [ ALTERA CORPORATION ]
