GS12281 datasheet(33/97 Pages) SEMTECH

33 / 97 page

GS12281

Final Data Sheet

Rev.9

PDS-061385

February 2019

33 of 97

Semtech

Proprietary & Confidential

www.semtech.com

Shape-Scan Procedure:

1. Ensure the offset and step parameters described in Table 4-5 are set to their default

values.

2. Configure the 4-point error rate threshold by setting each of the parameters listed

in Table 4-6.

3. Configure the eye monitor to run a shape-scan by setting

CTRL_EYE_SHAPE_SCAN_B to 1.

Start the scan and poll the scanner status register until the scan is complete. Please refer

to the flow diagram in Figure 4-9.

Figure 4-9: Shape-Scan Flow Diagram

Host determines Eye Width and Eye Height by reading from

the following 4 registers:

le = STAT_EYE_SHAPE_LEFT_EDGE_PHASE

re = STAT_EYE_SHAPE_RIGHT_EDGE_PHASE

pe =STAT_EYE_SHAPE_POS_EDGE_OFFSET

ne =STAT_EYE_SHAPE_NEG_EDGE_OFFSET

if pe > ne:

EyeHeight = (256 + ne - pe)

else:

EyeHeight = (ne - pe)

if le > re:

EyeWidtht = (128 + re - le)

else:

EyeWidtht = (re - le)

Host reads scan status from

STAT_EYE_MON_STATUS

Status

1 or 0

Host Resets Eye Scanner for new scan by

setting CTRL_EYE_MON_START = 0

Or power down by setting

CTRL_EYE_MON_POWER_CTRL = 0

Scan Failed

Reset Eye Scanner

Run Shape Scan

Shape Scan

Complete

Host powers up eye monitor and starts

Shape Scan by setting:

CTRL_EYE_MON_POWER_CTRL = 1

CTRL_EYE_MON_START = 1

Status = 0?

the host can write

ctrl_eye_mon_power_ctrl = 1 and

ctrl_eye_mon_start = 1 in the

same GSPI write, i.e. at the same

time. It is not necessary to set the

power up first.

Status = STAT_EYE_MON_STATUS

Note:

Please Note the Following:

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