8–36
Chapter 8: Configuration and Remote System Upgrades in Cyclone IV Devices
Configuration
May 2013
Altera Corporation
PS Configuration Timing
A PS configuration must meet the setup and hold timing parameters and the
maximum clock frequency. When using a microprocessor or another intelligent host
to control the PS interface, ensure that you meet these timing requirements.
shows the timing waveform for PS configuration when using an external
host device.
lists the PS configuration timing parameters for Cyclone IV devices.
Figure 8–16. PS Configuration Timing Waveform
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 IV device holds
nSTATUS
low during POR delay.
(3) After power up, before and during configuration,
CONF_DONE
is low.
(4) In user mode, drive
DCLK
either high or low when using the PS configuration scheme, whichever is more convenient.
When using the AS configuration scheme,
DCLK
is a Cyclone IV device output pin and must not be driven externally.
(5) Do not leave the
DATA[0]
pin floating after configuration. Drive the
DATA[0]
pin high or low, whichever is more
convenient.
nCO
N
FIG
nSTATUS
(2)
CO
N
F_DO
N
E
(3)
DCLK
(4)
DATA[0]
User I/O
I
N
IT_DO
N
E
Bit 0
Bit 1
Bit 2
Bit 3
Bit
n
t
CD2UM
t
CF2ST1
t
CF2CD
t
CFG
t
CH
t
CL
t
DH
t
DSU
t
CF2CK
t
STATUS
t
CLK
t
CF2ST0
t
ST2CK
User Mode
(5)
Tri-stated
w
ith internal pull-up resistor
User mode
Table 8–12. PS Configuration Timing Parameters For Cyclone IV Devices (Part 1 of 2)
Symbol
Parameter
Minimum
Maximum
Unit
Cyclone IV
Cyclone IV E
Cyclone IV E
t
CF2CD
nCONFIG
low to
CONF_DONE
low
—
500
ns
t
CF2ST0
nCONFIG
low to
nSTATUS
low
—
500
ns
t
CFG
nCONFIG
low pulse
width
500
—
ns
t
STATUS
nSTATUS
low pulse
width
45
230
µs
Summary of Contents for Cyclone IV
Page 10: ...x Chapter Revision Dates Cyclone IV Device Handbook March 2016 Altera Corporation Volume 1...
Page 14: ...I 2 Section I Device Core Cyclone IV Device Handbook March 2016 Altera Corporation Volume 1...
Page 274: ...vi Contents Cyclone IV Device Handbook February 2015 Altera Corporation Volume 2...
Page 440: ...iv Contents Cyclone IV Device Handbook December 2016 Altera Corporation Volume 3...
Page 442: ...vi Chapter Revision Dates Cyclone IV Device Handbook December 2016 Altera Corporation Volume 3...
Page 446: ......