DS110DF111 / Rate and Subrate Setting

Hi Kato,

The way to setup the DS110DF111 for these different datarates is to use the channel registers 0x60 - 0x63.  Programming these registers allows the DF111 to lock to different datarates within the valid VCO tuning range.

Not all the rates can be programmed at one time.  Only two of the rates can be programmed at once, one rate is programmed into Regs 0x60-0x61 and another into 0x62-0x63.  Register 0x64 is used to adjust the allowable PPM delta for each rate.

To set the Rate/Subrate so only VCO/1 datarates are valid, set Rate/Subrate = 11/10

This can be achieved by setting the channel register 0x2F = E6'h

I have listed the register settings for each of the datarates.  The following programming values can be placed into registers 0x60-0x61 for Group 0 or 0x62-0x63 for Group 1.  Register 0x64 can always be set to CC'h to provide adaquate VCO tuning range.

9.95328 Gbps:       C4'h    B1'h 

10.3125 Gbps:       90'h    B3'h

10.5200 Gbps:       99'h    B4'h

10.709225 Gbps:   8B'h   B5'h

11.049107 Gbps:   3E'h   B7'h

11.095730 Gbps:   7A'h   B7'h

11.270089 Gbps:   59'h   B8'h

11.317642 Gbps:   96'h   B8'h

An example of programming for 9.95 and 10.31 Gbps at the same time is shown below.

0x60 = C4'h

0x61 = B1'h

0x62 = 90'h

0x63 = B3'h

0x64 = CC'h

Regards,

Lee

Lee - san,

Thank you for the reply.

I understood that 11.317642Gbps  datarate could be programmed.

However, the datarate spec of DS110DF111 is from 8.5Gbps to 11.3Gbps.

Nevertheless, could you assure 11.317642Gbps datarate? should we recommend DS125DF111 device?

Best Regards,

Kato