M21050 datasheet(45/70 Pages) MA-COM

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Registers

21050-DSH-001-F

Mindspeed Technologies™

Mindspeed Proprietary and Confidential

2.2.7

CDR N Loop Bandwidth and Data Sampling Point Adjust

2.2.8

CDR N FRA LOL Window Control

Table 2-32. CDR N Loop Bandwidth and Data Sampling Point Adjust (Phadj_ctrl_N: Address M6h)

Bits

Type

Default

Label

Description

7:6

R/W

10b

i_trim

Adjusts the charge-pump current; the loop bandwidth (FLBW) scales

proportionally

00b: 0.65x nominal value

01b: 0.8x nominal value

10b: Nominal

11b: 1.15x nominal value

5:4

R/W

10b

r_sel

Adjusts the resistor of the CDR loop filter; the loop bandwidth (FLBW)

scales proportionally

00b: 0.72x nominal value

01b: Nominal

10b: 2.6x nominal value

3:0

R/W

0000b

phase_adj

Adjusts the static phase offset (sampling point) of the data

1111b: -122.5 mUI

1110b: -105 mUI

1101b: -87.5 mUI

1100b: -70 mUI

1011b: -52.5 mUI

1010b: -35.0 mUI

1001b: -17.5 mUI

1000b: 0 mUI

0000b: 0 mUI

0001b: 17.5 mUI

0010b: 35.0 mUI

0011b: 52.5 mUI

0100b: 70.0 mUI

0101b: 87.5 mUI

0110b: 105 mUI

0111b: 122.5 mUI

Table 2-33. CDR N FRA LOL Window Control (LOL_ctrl_N: Address M9h)

Bits

Type

Default

Label

Description

7:5

R/W

101b

tacq_LOL

Sets the value for the LOL reference window

Code

000b

001b

010b

011b

100b

101b

110b

111b

Value

128

256

512

1024

2048

4096

8192

16384

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