ORSPI4 datasheet(185/263 Pages) LATTICE

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Lattice Semiconductor

ORCA ORSPI4 Data Sheet

185

SERDES Electrical and Timing Characteristics

SERDES High Speed Data Transmitter

Table 65 speciﬁes serial data output buffer parameters measured on devices with typical and worst case process

parameters and over the full range of operation conditions.

Table 65. Serial Output Timing and Levels (CML I/O)

Transmitter output jitter is a critical parameter to systems with high-speed data links. Table 66 and Table 67 specify

the transmitter output jitter for typical and worst case devices over the full range of operating conditions.

Table 66. Channel Output Jitter (3.125 Gbits/s)

Table 67. Channel Output Jitter (2.5 Gbits/s)

Parameter

Min.

Typ.

Max.

Units

Rise Time (20%—80%)

110

Fall Time (80%—20%)

110

Common Mode

VDDOB – 0.30

VDDOB – 0.25

VDDOB – 0.15

Differential Swing (Full Amplitude)

600

700

1000

mVp-p

Differential Swing (Half Amplitude)

300

350

500

mVp-p

Output Load (external)

—

Ω.

1. Differential swings are measured at the end of 3 inches of FR-4 and 12 inches of coax cable.

Parameter

Min.

Typ.

Max.

Units

Deterministic

—

0.13

0.24

UIp-p

Random

—

0.06

0.12

UIp-p

Total

2, 3

—

0.19

0.36

UIp-p

1. With PRBS 2^7-1 data pattern, all channels operating, FPGA logic active, REFCLK jitter of 30 ps., 0

oC to 85oC, 1.425 V to 1.575 V supply.

2. Wavecrest SIA-3000 instrument used to measure one-sigma (rms) random jitter component value. This value is multiplied by 14 to provide

the peak-to-peak value that corresponds to a BER of 10

-12.

3. Total jitter measurement performed with Wavecrest SIA-3000 at a BER of 10

-12. See instrument documentation and other Wavecrest publi-

cations for a detailed discussion of jitter types included in this measurement.

Parameter

Min.

Typ.

Max.

Units

Deterministic

—

0.12

0.15

UIp-p

Random

—

0.06

0.16

UIp-p

Total

2, 3

—

0.18

0.31

UIp-p

1. With PRBS 2^7-1 data pattern, all channels operating, FPGA logic active, REFCLK jitter of 30 ps., 0

oC to 85oC, 1.425 V to 1.575 V supply.

2. Wavecrest SIA-3000 instrument used to measure one-sigma (rms) random jitter component value. This value is multiplied by 14 to provide

the peak-to-peak value that corresponds to a BER of 10

-12.

3. Total jitter measurement performed with Wavecrest SIA-3000 at a BER of 10

-12. See instrument documentation and other Wavecrest publi-

cations for a detailed discussion of jitter types included in this measurement.

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