GS12281 datasheet(63/97 Pages) SEMTECH

63 / 97 page

GS12281

Final Data Sheet

Rev.9

PDS-061385

February 2019

63 of 97

Semtech

Proprietary & Confidential

www.semtech.com

(Continued)

RATE_

DETECT_

MODE

(Continued)

CFG_MANUAL_RATE

4:1

R/W

Manual rate selection. The CDR will only

lock to the selected rate if

CFG_AUTO_RATE_DETECT_ENA = 0:



0 = Reserved - do not use.



1 = MADI



2 = SD



3 = HD



4 = 3G



5 = 6G



6 = 12G



7 = Reserved - do not modify.

CFG_AUTO_RATE_DETE

CT_ENA

0R/W

Set or disable auto rate detection mode

for the CDR.



0 = Disable auto rate detection



1 = Enable auto rate detection

When automatic rate detection is

disabled

(CFG_AUTO_RATE_DETECT_ENA = 0),

the rate is set by CFG_MANUAL_RATE.



Note: If using manual rate selection, the

host should set CFG_MANUAL_RATE to

1 through 6 first, then set

CFG_AUTO_RATE_ENA = 0.

RSVD

15:0

R/W

Reserved - do not modify.

REF_CLK_

MODE

RSVD

15:2

R/W

Reserved - do not modify.

CFG_REF_CLK_MODE_



MANUAL

1R/W

Manual external reference mode



selection:



0 = External reference clock mode



1 = Referenceless mode

Controls reference clock mode when



CFG_REF_CLK_MODE_AUTO = 0.

CFG_REF_CLK_MODE_



AUTO

0R/W

Automatic external reference selection



mode.



0 = Disable auto mode



1 = Enable auto mode

In auto mode, the device automatically



switches to reference clock mode when



the reference clock is detected. When



auto mode is disabled, reference clock



mode is controlled by



CFG_REF_CLK_MODE_MANUAL.

Note: Once the device has been

switched to external reference mode,

either manual or automatically, it can

not be manually set back to

referenceless mode unless it is followed

by a device reset.

Table 5-3: Control Register Descriptions (Continued)

Addressh

Name

Parameter Name

Bit

Slice

R/W

Reset

Valueh

Description

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