LMH0366 datasheet(30/41 Pages) TI2

30 / 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)

PPM Counter Contol

7:3

RSVD

R/W

00000

Reserved.

PPM_CNT_MODE

R/W

PPM counter mode. Controls the

use of the PPM counter and the

external reference clock when

qualifying lock.

0: Normal operation. Qualify lock

with the PPM counter if the

reference clock is detected.

1: Ignore the PPM counter when

determining lock, regardless of

the presence of a reference clock

(i.e. do not use the reference

clock and run in referenceless

mode).

PPM_START

R/W

Manual PPM count trigger. When

(PPM_START_OV) is set, this bit

can be used to start a manual

PPM count measurement. To

start another measurement, this

bit must be toggled low to high.

0: Normal operation. Manual

PPM count disabled.

1: Manual PPM count enabled.

PPM_START_OV

R/W

Manual PPM count enable.

Enables the use of register 0x2D

bit 1 (PPM_START) to manually

start a PPM count measurement.

0: Normal operation. PPM

counter is controlled

automatically by the LMH0366.

1: Manual PPM count operation

enabled. Register 0x2D bit 2

(PPM_CNT_MODE) should be

set to ignore the PPM counter so

that the LMH0366 will not

automatically attempt to start the

PPM counter.

PPM Threshold Control

7:0

PTCR1

R/W

11011011

1.485/2.97 Gbps low threshold,

bits 15:8.

PPM Threshold Control

7:0

PTCR2

R/W

11100110

1.485/2.97 Gbps low threshold,

bits 7:0.

PPM Threshold Control

7:0

PTCR3

R/W

11011100

1.485/2.97 Gbps high threshold,

bits 15:8.

PPM Threshold Control

7:0

PTCR4

R/W

00011010

1.485/2.97 Gbps high threshold,

bits 7:0.

PPM Threshold Control

7:0

PTCR5

R/W

11011011

1.4835/2.967 Gbps low

threshold, bits 15:8.

PPM Threshold Control

7:0

PTCR6

R/W

10101110

1.4835/2.967 Gbps low

threshold, bits 7:0.

PPM Threshold Control

7:0

PTCR7

R/W

11011011

1.4835/2.967 Gbps high

threshold, bits 15:8.

PPM Threshold Control

7:0

PTCR8

R/W

11100001

1.4835/2.967 Gbps high

threshold, bits 7:0.

PPM Threshold Control

7:0

PTCR9

R/W

11101111

270 Mbps low threshold, bits

15:8.

PPM Threshold Control

7:0

PTCR10

R/W

11100100

270 Mbps low threshold, bits 7:0.

PPM Threshold Control

7:0

PTCR11

R/W

11110000

270 Mbps high threshold, bits

15:8.

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