2–30
Chapter 2: Device Datasheet for Cyclone V Devices
Configuration Specification
FPP Configuration Timing when DCLK to DATA[] > 1
Figure 2–3 shows the timing waveform for an FPP configuration when using a
MAX II device or microprocessor as an external host. This waveform shows timing
when the DCLK-to-DATA[]ratio is more than 1.
(1), (2)
Figure 2–3. FPP Configuration Timing Waveform for Cyclone V Devices When the DCLK-to-DATA[] Ratio is > 1
tCF2ST1
tCFG
tCF2CK
nCONFIG
nSTATUS (3)
tSTATUS
tCF2ST0
CONF_DONE (4)
t
CL
tCF2CD
(8)
tST2CK
t
CH
DCLK (6)
DATA[15..0] (8)
User I/O
(7)
(5)
1
2
1
1
2
r
1
2
r
r
t
CLK
n
Word 0
Word 1
Word (n-1) Word
User Mode
User Mode
Word 3
t
t
tDSU
DH
DH
High-Z
(9)
INIT_DONE
tCD2UM
Notes to Figure 2–3:
(1) To find the DCLK-to-DATA[]ratio for your system, refer to Table 2–33 on page 2–27.
(2) The beginning of this waveform shows the device in user mode. In user mode, nCONFIG, nSTATUS, and CONF_DONEare at logic high levels.
When nCONFIGis pulled low, a reconfiguration cycle begins.
(3) After power up, the Cyclone V device holds nSTATUSlow for the time as specified by the POR delay.
(4) After power up, before and during configuration, CONF_DONEis low.
(5) Do not leave DCLKfloating after configuration. You can drive it high or low, whichever is more convenient.
(6) “r” denotes the DCLK-to-DATA[]ratio. For the DCLK-to-DATA[]ratio based on the decompression and the design security feature enable
settings, refer to Table 2–33 on page 2–27.
(7) If needed, pause DCLKby holding it low. When DCLKrestarts, the external host must provide data on the DATA[15..0]pins prior to sending
the first DCLKrising edge.
(8) To ensure a successful configuration, send the entire configuration data to the Cyclone V device. CONF_DONEis released high after the Cyclone V
device receives all the configuration data successfully. After CONF_DONEgoes high, send two additional falling edges on DCLKto begin
initialization and enter user mode.
(9) After the option bit to enable the INIT_DONEpin is configured into the device, INIT_DONEgoes low.
Cyclone V Device Handbook
February 2012 Altera Corporation
Volume 1: Device Overview and Datasheet
ALTERA [ ALTERA CORPORATION ]
