LMH0366 datasheet(28/41 Pages) TI2

28 / 41 page

LMH0366

SNAS585D – APRIL 2012 – REVISED APRIL 2013

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Table 8. SPI Registers (continued)

Addr

Name

Bits

Field

R/W

Default

Description

(hex)

(binary)

EOM Control 3

FAST_EOM

R/W

Fast eye opening monitor mode.

0: Normal EOM mode.

1: Fast EOM mode. (In this

mode, the control software does

not need to configure the phase

and voltage DAC values as this

occurs automatically.)

6:5

RSVD

R/W

Reserved.

VEO_MAX_ERR

Vertical eye opening maximum

error. Following HEO/VEO

measurement, this error bit

indicates that no top or bottom of

the eye was found.

0: No error.

1: Error - no top or bottom of the

eye was found.

NO_OPENING_ERR

No eye opening error. Following

HEO/VEO measurement, this

error bit indicates that no eye

opening was found (i.e. there

was no point found at which

there were no hits).

0: No error.

1: Error - no eye opening was

found.

NO_HITS_ERR

No hits error. Following

HEO/VEO measurement, this

error bit indicates that there were

no points found at which there

was a hit.

0: No error.

1: Error - no hits found.

GET_HEO_VEO

R/W

Get horizontal and vertical eye

opening. Initiates measurement

of the horizontal eye opening and

vertical eye opening by the EOM

and clears itself once the

measurements are complete.

0: EOM HEO/VEO measurement

is inactive or complete.

1: EOM HEO/VEO measurement

active.

EOM_START

R/W

Eye opening monitor active.

Indicates that the EOM is actively

searching for hits at the current

phase/voltage DAC combination.

In normal EOM mode, setting this

bit starts the EOM counter. In

fast EOM mode, this bit is set

automatically. (This bit is self-

clearing.)

0: EOM inactive.

1: EOM active.

EOM Count Status 1

7:0

EOM_COUNT[15:8]

Eye opening monitor hits count,

bits 15:8. Upper byte of the

number of hits accumulated for

the previous EOM phase/voltage

DAC combination.

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