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ZHCSKE8D March 2016 – October 2019 DS250DF410

PRODUCTION DATA.

封裝選項

機械數據 (封裝 | 引腳)

ABM|101
- MPBGAL0B

散熱焊盤機械數據 (封裝 | 引腳)

訂購信息

8.3.9.1 Setting the Output V_OD, Pre-Cursor, and Post-Cursor Equalization

The output differential voltage (V_OD), pre-cursor, and post-cursor equalization of the driver is controlled by manipulating the FIR tap settings. The main cursor tap is the primary knob for amplitude adjustment. The pre- and post-cursor FIR tap settings can then be adjusted to provide equalization. To maintain a constant peak-to-peak VOD, the user should adjust the main cursor tap value relative to the pre- and post-cursor tap changes so as to maintain a constant absolute sum of the FIR tap values. The table below shows various settings for V_OD settings ranging from 205 mVpp to 1225 mVpp (typical). Note that the output peak-to-peak amplitude is a function of the sum of the absolute values of the taps, whereas the low-frequency amplitude is purely a function of the main-cursor value.

Table 2. Typical VOD and FIR Values

FIR SETTINGS			Peak-to Peak VOD(V)	RPRE(dB)	RPST(dB)
PRE-CURSOR: REG_0x3E[6:0]	MAIN-CURSOR: REG_0x3D[6:0]	POST-CURSOR: REG_0x3F[6:0]	Peak-to Peak VOD(V)	RPRE(dB)	RPST(dB)
0	0	0	0.205	NA	NA
0	+1	0	0.260	NA	NA
0	+2	0	0.305	NA	NA
0	+3	0	0.355	NA	NA
0	+4	0	0.395	NA	NA
0	+5	0	0.440	NA	NA
0	+6	0	0.490	NA	NA
0	+7	0	0.525	NA	NA
0	+8	0	0.565	NA	NA
0	+9	0	0.610	NA	NA
0	+10	0	0.650	NA	NA
0	+11	0	0.685	NA	NA
0	+12	0	0.720	NA	NA
0	+13	0	0.760	NA	NA
0	+14	0	0.790	NA	NA
0	+15	0	0.825	NA	NA
0	+16	0	0.860	NA	NA
0	+17	0	0.890	NA	NA
0	+18	0	0.925	NA	NA
0	+19	0	0.960	NA	NA
0	+20	0	0.985	NA	NA
0	+21	0	1.010	NA	NA
0	+22	0	1.040	NA	NA
0	+23	0	1.075	NA	NA
0	+24	0	1.095	NA	NA
0	+25	0	1.125	NA	NA
0	+26	0	1.150	NA	NA
0	+27	0	1.165	NA	NA
0	+28	0	1.190	NA	NA
0	+29	0	1.205	NA	NA
0	+30	0	1.220	NA	NA
0	+31	0	1.225	NA	NA
0	+18	-1	0.960	NA	2.1
0	+17	-2	0.960	NA	2.5
0	+16	-3	0.960	NA	3.1
0	+15	-4	0.960	NA	3.8
0	+14	-5	0.960	NA	4.7
0	+13	-6	0.960	NA	5.8
0	+12	-7	0.960	NA	7.2
0	+11	-8	0.960	NA	9.0
0	+10	-9	0.960	NA	11.6
-1	18	0	0.960	1.0	NA
-2	17	0	0.960	1.6	NA
-3	16	0	0.960	2.4	NA
-4	15	0	0.960	3.3	NA
0	26	-1	1.165	NA	1.1
0	25	-2	1.165	NA	1.3
0	24	-3	1.165	NA	1.8
0	23	-4	1.165	NA	2.2
0	22	-5	1.165	NA	2.7
0	21	-6	1.165	NA	3.3
0	20	-7	1.165	NA	3.9
0	19	-8	1.165	NA	4.7
0	18	-9	1.165	NA	5.7
0	17	-10	1.165	NA	6.9
0	16	-11	1.165	NA	8.4
0	15	-12	1.165	NA	10.1
-1	26	0	1.165	0.7	NA
-2	25	0	1.165	1.2	NA
-3	24	0	1.165	1.5	NA
-4	23	0	1.165	2.0	NA
-5	22	0	1.165	2.6	NA
-6	21	0	1.165	3.2	NA
-7	20	0	1.165	4.0	NA

The recommended pre-cursor and post-cursor settings for a given channel will depend on the channel characteristics (mainly insertion loss) as well as the equalization capabilities of the downstream receiver. The DS250DF410 receiver, with its highly-capable CTLE and DFE, does not require a significant amount of pre- or post-cursor. The figures below give general recommendations for pre- and post-cursor for different channel loss conditions. The insertion loss (IL) in these plots refers to the total loss between the link partner transmitter and the DS250DF410 receiver.

Figure 11. Guideline for Link Partner FIR Settings When IL ≤ 15 dB

Figure 12. Guideline for Link Partner FIR Settings When IL ≤ 25 dB

Figure 13. Guideline for Link Partner FIR Settings When IL ≤ 35 dB