
Chapter 1: Cyclone IV Device Datasheet
1–27
Switching Characteristics
December 2013
Altera Corporation
Table 1–29 lists the active configuration mode specifications for Cyclone IV devices.
Table 1–30 lists the JTAG timing parameters and values for Cyclone IV devices.
Periphery Performance
This section describes periphery performance, including high-speed I/O and external
memory interface.
I/O performance supports several system interfaces, such as the high-speed I/O
interface, external memory interface, and the PCI/PCI-X bus interface. I/Os using the
SSTL-18 Class I termination standard can achieve up to the stated DDR2 SDRAM
interfacing speeds. I/Os using general-purpose I/O standards such as 3.3-, 3.0-, 2.5-,
1.8-, or 1.5-LVTTL/LVCMOS are capable of a typical 200 MHz interfacing frequency
with a 10 pF load.
Table 1–29. Active Configuration Mode Specifications for Cyclone IV Devices
Programming Mode
DCLK Range
Typical DCLK
Unit
20 to 40
33
MHz
Active Serial (AS)
20 to 40
33
MHz
(1) AP configuration mode is only supported for Cyclone IV E devices.
Table 1–30. JTAG Timing Parameters for Cyclone IV Devices
(1)Symbol
Parameter
Min
Max
Unit
tJCP
TCK clock period
40
—
ns
tJCH
TCK clock high time
19
—
ns
tJCL
TCK clock low time
19
—
ns
tJPSU_TDI
JTAG port setup time for TDI
1
—
ns
tJPSU_TMS JTAG port setup time for TMS
3
—
ns
tJPH
JTAG port hold time
10
—
ns
tJPCO
JTAG port clock to output (2), (3) —15
ns
tJPZX
JTAG port high impedance to valid output (2), (3) —15
ns
tJPXZ
JTAG port valid output to high impedance (2), (3) —15
ns
tJSSU
Capture register setup time
5
—
ns
tJSH
Capture register hold time
10
—
ns
tJSCO
Update register clock to output
—
25
ns
tJSZX
Update register high impedance to valid output
—
25
ns
tJSXZ
Update register valid output to high impedance
—
25
ns
(2) The specification is shown for 3.3-, 3.0-, and 2.5-V LVTTL/LVCMOS operation of JTAG pins. For 1.8-V
LVTTL/LVCMOS and 1.5-V LVCMOS, the output time specification is 16 ns.
(3) For EP4CGX22, EP4CGX30 (F324 and smaller package), EP4CGX110, and EP4CGX150 devices, the output time
specification for 3.3-, 3.0-, and 2.5-V LVTTL/LVCMOS operation of JTAG pins is 16 ns. For 1.8-V LVTTL/LVCMOS
and 1.5-V LVCMOS, the output time specification is 18 ns.