Chapter 2: Device Datasheet for Cyclone V Devices
2–33
Configuration Specification
Table 2–37 lists the internal clock frequency specification for the AS configuration
scheme.
Table 2–37. DCLK Frequency Specification in the AS Configuration Scheme for Cyclone V
Devices—Preliminary (1), (2)
Minimum
Typical
7.9
Maximum
12.5
Unit
MHz
MHz
MHz
MHz
5.3
10.6
21.3
15.7
31.4
62.9
25.0
50.0
42.6
100.0
Notes to Table 2–37:
(1) This applies to the DCLKfrequency specification when using the internal oscillator as the configuration clock
source.
(2) The AS multi-device configuration scheme does not support DCLKfrequency of 100 MHz.
PS Configuration Timing
Figure 2–5 shows the timing waveform for a PS configuration when using a MAX II
device or microprocessor as an external host.
Figure 2–5. PS Configuration Timing Waveform for Cyclone V Devices (1)
tCF2ST1
tCFG
tCF2CK
nCONFIG
nSTATUS (2)
tSTATUS
tCF2ST0
(6)
tCLK
CONF_DONE (3)
t
CH tCL
tCF2CD
tST2CK
(4)
(5)
DCLK
tDH
Bit 2 Bit 3
Bit n
Bit 0 Bit 1
DATA0
tDSU
High-Z
User I/O
User Mode
INIT_DONE (7)
tCD2UM
Notes to Figure 2–5:
(1) 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.
(2) After power up, the Cyclone V device holds nSTATUSlow for the time of the POR delay.
(3) After power up, before and during configuration, CONF_DONEis low.
(4) Do not leave DCLKfloating after configuration. You can drive it high or low, whichever is more convenient.
(5) DATA0is available as a user I/O pin after configuration. The state of this pin depends on the dual-purpose pin settings in the Device and Pins
Option.
(6) 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.
(7) After the option bit to enable the INIT_DONEpin is configured into the device, INIT_DONEgoes low.
February 2012 Altera Corporation
Cyclone V Device Handbook
Volume 1: Device Overview and Datasheet
ALTERA [ ALTERA CORPORATION ]
