Page 48
Configuration Specification
FPP Configuration Timing when DCLK to DATA[] = 1
Figure 17 shows the timing waveform for an FPP configuration when using a
MAX® II device as an external host. This waveform shows timing when the
DCLK-to-DATA[] ratio is 1.
1
When you enable decompression or the design security feature, the DCLK-to-DATA[]
ratio varies for FPP x8 and FPP x16. For the respective DCLK-to-DATA[] ratio, refer to
Table 50 on page 1–47.
Figure 17. DCLK-to-DATA[] FPP Configuration Timing Waveform for Cyclone V Devices When the Ratio is 1 (1)
tCF2ST1
tCFG
tCF2CK
nCONFIG
nSTATUS (2)
tSTATUS
(6)
tCF2ST0
tCLK
CONF_DONE (3)
t
CH tCL
tCF2CD
tST2CK
(4)
DCLK
tDH
Word 0 Word 1 Word 2 Word 3
Word n-2 Word n-1
DATA[15..0](5)
User Mode
User Mode
tDSU
High-Z
User I/O
(7)
INIT_DONE
tCD2UM
Notes to Figure 17:
(1) The beginning of this waveform shows the device in user mode. In user mode, nCONFIG
nCONFIG is pulled low, a reconfiguration cycle begins.
, nSTATUS, and CONF_DONE are at logic-high levels. When
(2) After power up, the Cyclone V device holds nSTATUS low for the time of the POR delay.
(3) After power up, before and during configuration, CONF_DONE is low.
(4) Do not leave DCLK floating after configuration. DCLK is ignored after configuration is complete. It can toggle high or low if required.
(5) For FPP x16, use DATA[15..0]. For FPP x8, use DATA[7..0]. DATA[15..0] are available as a user I/O pin after configuration. The state of this
pin depends on the dual-purpose pin settings.
(6) To ensure a successful configuration, send the entire configuration data to the Cyclone V device. CONF_DONE is released high when the Cyclone V
device receives all the configuration data successfully. After CONF_DONE goes high, send two additional falling edges on DCLK to begin initialization
and enter user mode.
(7) After the option bit to enable the INIT_DONE pin is configured into the device, INIT_DONE goes low.
Cyclone V Device Datasheet
July 2014 Altera Corporation
INTEL [ INTEL ]
