M2050 datasheet(3/12 Pages) ICST

3 / 12 page

M2050/51/52 Datasheet Rev 1.0

3 of 12

Revised 23Jun2005

Integ r ated Circuit Systems, Inc. ● Communications Modules ● www.ics t.com ● tel (508) 852-5400

M2050/51/52

SAW PLL FOR 10GBE 64B/66B FEC

Preliminar y In f o r m atio n

Integrated

Circuit

Systems, Inc.

DETAILED BLOCK DIAGRAM

Figure 3: Detailed Block Diagram

DIVIDER SELECTION TABLES

Mfin Divider Look-Up Tables (LUT)

The FIN_SEL1:0 pins select the feedback divider value

(“Mfin”). Since the VCSO frequency is fixed, this allows

input reference selection. The look-up tables vary by

device variant.

M2050/51/52: Mfin Value LUT

Mfec and Rfec Divider Look-Up Tables (LUTs)

The FEC_SEL pins select the Mfec/Rfec divider ratio.

The look-up tables vary by device variant. The Mfec

and Rfec values also establish phase detector

frequency. A lower phase detector frequency improves

jitter tolerance and lowers loop bandwidth.

M2050: Map LUT (10GbE to LAN, 255/238 FEC, or 255/237 FEC)

Phase

Locked

Loop

(PLL)

M2050, 51, 52

SAW Delay Line

Phase

Shifter

VCSO

POST

nVC

POST

nOP_OUT

OP_OUT

POST

LOOP

OP_IN

nOP_IN

Phase

Detector

Loop Filter

Amplifier

External

Loop Filter

Components

FOUT0

nFOUT0

FEC_SEL1:0

FIN_SEL1:0

Rfec

Div

MUX

REF_SEL

DIF_REF0

nDIF_REF0

Mfin Divider

LUT

Mfin Divider

(1, 4, 5, 25)

Mfec Div

FOUT1

nFOUT1

P Divider

(1, 4, 5, 25,

or TriState)

P_SEL2:0

NBW

Mfec/Rfec Divider

LUT

DIF_REF1

nDIF_REF1

LOL

Phase Buildout Option

Hitless Switch Option

P Divider

LUT

FIN_SEL1:0

Mfin

Value

Sample Input Reference Freq. (MHz) Options

For M20501, M2051 & M20522

Note 1: For M2050 with Fvcso = 669.6429

Note 2: For M2051 and M2052 with Fvcso = 625.0000.

25.00

0 1

125.00

1 0

156.25

1 1

625.00

Table 3: M2050/51/52: Mfin Value LUT

FEC_SEL1:0

Mfec Rfec

Description

Base Input

Rate (MHz)

Fvcso =

Base Output

Rate (MHz)

For M2050 with Fvcso = 644.5313 (10GbE to 10GbE LAN rate):

0 0

33 32 10GbE to 10GbE LAN

625.0000

644.5313

0 1

33 33 10GbE LAN repeater

644.5313

For M2050 with Fvcso = 669.6429 (10GbE to 10GbE 255/238 FEC rate):

1 0

15 14 10GbE to 10GbE 255/238 FEC

625.0000

669.6429

1 1

15 15 10GbE 255/238 FEC repeater

669.6429

For M2050 with Fvcso = 690.5692 (10GbE LAN to 10GbE LAN 255/238 FEC):

1 0

15 14

10GbE LAN

to 10GbE LAN

255/238 FEC

644.5313

690.5692

1 1

15 15 10GbE LAN 255/238 FEC repeater 690.5692

690.5692

For M2050 with Fvcso = 693.4830 (10GbE LAN to 10GbE LAN 255/237 FEC):

0 0

85 79

10GbE LAN

to 10GbE LAN

255/237 FEC

644.5313

693.4830

0 1

85 85 10GbE LAN 255/237 FEC repeater 693.4830

693.4830

Table 4: M2050: Map LUT (10GbE to LAN, 255/238 FEC, or 255/237 FEC)

M2050 Folha de dados(PDF) 3 Page - Integrated Circuit Systems

M2050 Folha de dados(HTML) 3 Page - Integrated Circuit Systems

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12

Folha de dados Download

Ligação URL