LMH0366 datasheet(31/41 Pages) TI2

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LMH0366

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SNAS585D – APRIL 2012 – REVISED APRIL 2013

Table 8. SPI Registers (continued)

Addr

Name

Bits

Field

R/W

Default

Description

(hex)

(binary)

PPM Threshold Control

7:0

PTCR12

R/W

00011100

270 Mbps high threshold, bits

7:0.

PPM Threshold Control

7:0

PTCR13

R/W

11011110

125 Mbps low threshold, bits

15:8.

PPM Threshold Control

7:0

PTCR14

R/W

00011111

125 Mbps low threshold, bits 7:0.

PPM Threshold Control

7:0

PTCR15

R/W

11011110

125 Mbps high threshold, bits

15:8.

PPM Threshold Control

7:0

PTCR16

R/W

01010011

125 Mbps high threshold, bits

7:0.

PPM Timer Control 1

7:4

RSVD

R/W

0000

Reserved.

3:0

PPM_TIMER[11:8]

R/W

1100

PPM reference clock timer, bits

11:8. This field, along with

12-bit value corresponding to the

number of reference clock cycles

in which to count VCO/12 clock

cycles (the measurement period).

PPM Timer Control 1

7:0

PPM_TIMER[7:0]

R/W

00000000

PPM reference clock timer, bits

7:0. This field, along with register

0x3E bits 3:0, comprise a 12-bit

value corresponding to the

number of reference clock cycles

in which to count VCO/12 clock

cycles (the measurement period).

Reserved

7:0

RSVD

R/W

00000000

Reserved.

PPM Status

7:4

RSVD

0000

Reserved.

REF_CLK_DET

Reference clock detected.

0: No external reference clock

detected or reference clock

detector disabled.

1: External reference clock

detected.

RATE_1_OV_M

1 over M rate detect.

0: 1 over M rate not detected.

1: 1.485/1.001 or 2.970/1.001

Gbps rate detected.

PPM_CNT_MET

PPM count in range. When

(PPM_CNT_RDY) is set, this bit

indicates that the current PPM

count measurement was in range

of one of the four valid bands

configured in the PTCR registers.

PPM_CNT_RDY

PPM count ready. Indicates the

completion of a PPM count

measurement.

0: PPM count measurement not

ready or PPM counter disabled.

1: PPM count measurement

complete.

PPM Count Status 1

7:0

PPM_COUNT[15:8]

PPM cycle count, bits 15:8. This

field, along with register 0x43 bits

7:0, comprise a 16-bit value

corresponding to the number of

VCO/12 clock cycles in the

current PPM count

measurement.

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