PM5364 pmc-sierra, PM5364 Datasheet - Page 234

• Manufacturer Part Number: PM5364
• Description: Tupp 2488 Assp Telecom Standard
• Manufacturer: pmc-sierra

13.15.2
Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
Document No.: PMC-2011334, Issue 7
Figure 61 DC Balance Count with Random Data
Suggested settings for DECAY_PER, DECAY_FAC and DC_BAL_THRESH are 108, 1/8, and
500 for 622 Mbit/s links and 430, 1/8, and 1000 for 2.488 Gbit/s links, respectively. The
numbers given are to be used guidelines. It is recommended that simulations be run to derive
parameters for specific applications.
The parameters that configure the DC balance should not be changed while the device is in
normal operation as the effects are non-deterministic and may cause spurious errors.
The recommended setting for the CID threshold is 16 for both 622 Mbit/s and 2.488 Gbit/s
links. A threshold of 16 will produce an error if 128 to 135 CIDs are received. The exact
number required to generate an error depends on the byte alignment. For example, a CID
threshold of 16 bytes (128 bits) may take up to 17 bytes of consecutive ones or zeroes to trigger
the CID interrupt and force the RSEF out of frame alignment.
The CID_EN bit must be set to logic 1 in addition to setting the CID_TRAN_DC_EN bit to
logic 1 for the CID detector to be enabled.
CID Detector
-100
-200
-300
-400
-500
400
300
200
100
0
Time (us)
TUPP™ 2488 ASSP Telecom Standard Product Data Sheet
Released
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