M21050 datasheet(13/70 Pages) MA-COM

13 / 70 page

Functional Description

21050-DSH-001-F

Mindspeed Technologies™

Mindspeed Proprietary and Confidential

1.1.7

Multifunction Pins Defined for Hardwired Mode

A subset of options in the M21050 can be accessed with hardwired pins, as defined in Table 1-4. The hardwired

data-rates, along with the default reference frequency, are shown in Table 1-5.

Table 1-4.

Multifunction Pins for Hardwired Mode

Function

Description

MF0

Data-Rate 0

CDR Rate Select (See Table 1-5 for description)

MF1

Data-Rate 1

CDR Rate Select (See Table 1-5 for description)

MF2

Data-Rate 2

CDR Rate Select (See Table 1-5 for description)

MF3

A-side equalization and

B-side pre-emphasis enable

H = Disabled

L = A-side input equalization enabled, and

B-side output pre-emphasis enabled

MF4

B-side equalization and

A-side pre-emphasis enable

H = Disabled

L = B-side input equalization enabled, and

A-side output pre-emphasis enabled

MF5

A-side polarity flip

H = Normal data polarity

L = Inverted polarity

MF6

B-side polarity flip

H = Normal data polarity

L = Inverted polarity

MF7

Output Level

L = All outputs powered down

H = All outputs on: nominal output level. Output type selected with Out_Mode

Table 1-5.

Hardwired Data-Rates and Associated Reference Clock Frequencies

Pins

MF [2:0]

Application

Signal Data-rate (Gbps)

Reference Frequency (MHz)

000

10x Fibre Channel - XAUI

3.1875

159.375

001

10 Gigabit Ethernet - XAUI

3.125

156.25

010

InfiniBand

2.5

62.5

011

STS-48

2.48832

19.44

100

InfiniBand

2.5

250

101

2x Fibre Channel

2.125

106.25

110

Gigabit Ethernet

1.250

125

111

1x Fibre Channel

1.0625

106.25

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