EP2C8A datasheet(145/168 Pages) ALTERA

145 / 168 page

Altera Corporation

5–55

February 2008

Cyclone II Device Handbook, Volume 1

DC Characteristics and Timing Specifications

High Speed I/O Timing Specifications

The timing analysis for LVDS, mini-LVDS, and RSDS is different

compared to other I/O standards because the data communication is

source-synchronous.

You should also consider board skew, cable skew, and clock jitter in your

calculation. This section provides details on the timing parameters for

high-speed I/O standards in Cyclone II devices.

Table 5–47 defines the parameters of the timing diagram shown in

Figure 5–3.

SSTL_2_CLASS_I

OCT_50

_OHMS

SSTL_18_CLASS_I

OCT_50

_OHMS

Table 5–46. Maximum Output Clock Toggle Rate Derating Factors (Part 4 of 4)

I/O Standard

Drive

Strength

Maximum Output Clock Toggle Rate Derating Factors (ps/pF)

Column I/O Pins

Row I/O Pins

Dedicated Clock

Outputs

–6

Speed

Grade

–7

Speed

Grade

–8

Speed

Grade

–6

Speed

Grade

–7

Speed

Grade

–8

Speed

Grade

–6

Speed

Grade

–7

Speed

Grade

–8

Speed

Grade

Table 5–47. High-Speed I/O Timing Definitions (Part 1 of 2)

Parameter

Symbol

Description

High-speed clock

fHSCKLK

High-speed receiver and transmitter input and output clock frequency.

Duty cycle

tDUTY

Duty cycle on high-speed transmitter output clock.

High-speed I/O data rate

HSIODR

High-speed receiver and transmitter input and output data rate.

Time unit interval

TUI

TUI = 1/HSIODR.

Channel-to-channel skew

TCCS

The timing difference between the fastest and slowest output edges,

including tCO variation and clock skew. The clock is included in the

TCCS measurement.

TCCS = TUI – SW – (2 × RSKM)

EP2C8A Datasheet(PDF) 145 Page - Altera Corporation

EP2C8A Datasheet(HTML) 145 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