DS125DF111: 155M/622M data rate

Miranda Gu

Genius 16632 points

Part Number: DS125DF111

Hi team,

My customer plan to use DS125DF111 for 155M/622M/10.709G data rate.

Can DS125DF111 support as low as 155M/622M data rate? How to configure the registers?

0 Rodrigo Natal over 4 years ago

Hi,

10.709Gbps is supported in retimed mode. Refer to the programming guide Section 3.10 for instructions for implementing CDR manual mode configuration.

155M and 622M data rates are supported using CDR bypass mode. See below register write routine taken from the programming guide.

Table 1. Bypass CDR

STEP	SHARED/CHANNEL REGISTER SET	OPERATION	REGISTER ADDRESS [HEX]	REGISTER VALUE [HEX]	WRITE MASK [HEX]	COMMENT
1	Channel	Write	0	04	04	Reset channel register to default.
2	Channel	Write	09	20	20	Enable override output mux use reg_0x1e.
3	Channel	Write	1E	00	E0	Output raw data.

Table 2. Bypass CDR (continued)

STEP	SHARED/CHANNEL REGISTER SET	OPERATION	REGISTER ADDRESS [HEX]	REGISTER VALUE [HEX]	WRITE MASK [HEX]	COMMENT
4	Channel	Write	3F	80	80	Disable fast research for refmode 3.
5	Channel	Write	31	00	60	Set adapt mode to 0.
6	Channel	Write	3A	00	FF	Set EQ boost value as 0.
7	Channel	Write	40	00	FF	Set EQ boost value as 0.
8	Channel	Write	03	00	FF	Set EQ boost value as 0.
9	Channel	Write	2D	08	08	Enable overriding the EQ setting from 0x03 register setting(Need to set for DF111s).
10	Channel	Write	A	0C	0C	CDR Reset.
11	Channel	Write	A	00	0C	Release CDR Reset.

Cordially,

Rodrigo Natal

HSSC Applications Engineer

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