EP4CE40 datasheet(117/488 Pages) ALTERA

117 / 488 page

Chapter 6: I/O Features in Cyclone IV Devices

6–11

I/O Standards

May 2013

Altera Corporation

Cyclone IV Device Handbook,

Volume 1

Figure 6–4 shows the single-ended I/O standards for OCT without calibration. The RS

shown is the intrinsic transistor impedance.

All I/O banks and I/O pins support impedance matching and series termination.

Dedicated configuration pins and JTAG pins do not support impedance matching or

series termination.

RS OCT is supported on any I/O bank. VCCIO and VREF must be compatible for all I/O

pins to enable RS OCT in a given I/O bank. I/O standards that support different RS

values can reside in the same I/O bank as long as their VCCIO and VREF do not conflict.

Impedance matching is implemented using the capabilities of the output driver and is

subject to a certain degree of variation, depending on the process, voltage, and

temperature.

f For more information about tolerance specification, refer to the Cyclone IV Device

Datasheet chapter.

I/O Standards

Cyclone IV devices support multiple single-ended and differential I/O standards.

Cyclone IV devices support 3.3-, 3.0-, 2.5-, 1.8-, 1.5-, and 1.2-V I/O standards.

Table 6–3 summarizes I/O standards supported by Cyclone IV devices and which

I/O pins support them.

Figure 6–4. Cyclone IV Devices RS OCT Without Calibration

Cyclone IV Device

Driver Series Termination

Receiving

Device

VCCIO

GND

Table 6–3. Cyclone IV Devices Supported I/O Standards and Constraints (Part 1 of 3)

I/O Standard

Type

Standard

Support

VCCIO Level (in V)

Column I/O Pins

Row I/O Pins (1)

Input

Output

CLK,

DQS

PLL_OUT

User

I/O

Pins

CLK,

DQS

User I/O

Pins

3.3-V LVTTL,

3.3-V LVCMOS (2)

Single-ended

JESD8-B

3.3/3.0/2.5

(3)

3.3

3.0-V LVTTL,

3.0-V LVCMOS (2)

Single-ended

JESD8-B

3.3/3.0/2.5

(3)

3.0

EP4CE40 Datasheet(PDF) 117 Page - Altera Corporation

EP4CE40 Datasheet(HTML) 117 Page - Altera Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL