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M21050 Datasheet(PDF) 21 Page - M/A-COM Technology Solutions, Inc.

Part # M21050
Description  Duplex Quad (Octal) Multi-Rate CDR (1.0 Gbps - 3.2 Gbps)
PDF  70 Pages
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Manufacturer  MA-COM [M/A-COM Technology Solutions, Inc.]
Direct Link  http://www.macomtech.com
Logo MA-COM - M/A-COM Technology Solutions, Inc.

M21050 Datasheet(HTML) 21 Page - M/A-COM Technology Solutions, Inc.

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Functional Description
21050-DSH-001-F
Mindspeed Technologies™
13
Mindspeed Proprietary and Confidential
The FLL drives iFV to iFR, and it is the primary function of LOLCir to determine when to turn off the FLL, so the
CDR can achieve phase lock. LOLCir uses the frequency difference between iFV and iFR to switch LOL, which
turns on and off the secondary FLL. The thresholds where LOL makes a transition are defined as windows, which
are fixed in the hardwired mode, and programmable in the two-wire interface mode. To prevent LOL from toggling
at the threshold, two windows are used for hysteresis. When LOL = L and the frequency difference exceeds the
larger window (WRW), LOL L-to-H occurs to signal an out of lock case. When LOL = H (and LOA = L), the fre-
quency difference is brought within the narrow (NRW) window, after which LOL makes a H-to-L transition signaling
in-lock. If LOA = H when LOL = H, the FLL remains on to keep the VCO locked to the reference, until a signal is
present. Nacq is defined with LOL_ctrl_N[7:5], Nnarrow is defined with LOL_ctrl_N[4:1], and Nwide is defined with
LOL_ctrl_N[0]. The LOLCir averages a large number of transitions before making an LOL decision. This averaging
time is referred to as the LOL decision time or DTLOL.
Table 1-11 shows various window sizes for different applications, including the default value in both the hardwired
and serial interface modes.
Table 1-10.
DRD/RFD/VCD Settings for Different Data-Rates and Reference Frequencies
Application
DR
(Mbps)
Fref
(MHz)
DRD
RFD
VCD
Notes
10GE - XAUI
3125
156.25
1
8
160
1
10GE-XAUI
3125
25
1
2
250
10GFC - XAUI
3187.5
159.375
1
8
160
1
InfiniBand
2500
250
1
16
160
1
InfiniBand
2500
125
1
8
160
InfiniBand
2500
62.5
1
4
160
1
STS-48
2488.32
155.52
1
8
128
1
STS-48
2488.32
19.44
1
1
128
2GFC
2125
106.25
1
8
160
1
2GFC
2125
25
1
2
170
GE
1250
125
2
8
160
1
GE
1250
25
2
2
200
FC
1062.5
106.25
2
8
160
1
NOTE:
1.
Bold text denotes data-rates selectable in the hardwired control mode.



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