DDR5 DQ Write Protocols: Proposals and Flow Details
Explore the proposed DDR5 DQ write protocols, including JEDEC and generic versions, detailing communication between Tx and Rx, along with BCI flow information. Delve into what Tx tells Rx and vice versa, along with an optPulseMetric MATLAB function for calculating standard metrics. Discover the next steps for documenting and publishing BCI protocols in the Open Forum.
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DDR5_DQ_Write_Protocol (BIRD 147/201) IBIS-ATM July 28, 2020 Walter Katz 1
General BCI Flow (BIRD 147/201) 1. Tx_Read BCI_Parameters_In is Rx BCI_Parameters_Out 2. Tx_Write makes Tx BCI_Parameters_Out 3. Rx_Read BCI_Parameters_In is Tx BCI_Parameters_Out 4. Rx_Write makes Rx BCI_Parameters_Out 5. If BCI_State is still Training then go to Step 1 above. (Note, BIRD 147 communications use file I/O, BIRD 201 communicates use **BCI_Parameters_Out and *BCI_Parameters_In) 2
I Am Proposing Two DDR5_DQ_Write Protocols DDR5_DQ_Write_JEDEC Tx communicates to Rx DFE tap indices, and requested BER Rx communicates to Tx DFE tap indices used, DFE tap coeficients used and metrics from Rx impulse_response output DDR5_DQ_Write_Generic Tx communicates to Rx DFE tap coefficient, and requested BER Rx communicates to Tx DFE tap indices used, DFE tap coeficients used and metrics from Rx impulse_response output 3
What the Tx Tells the Rx Each Time (DDR5_DQ_Write_JEDEC_Tx (BER_Requested 1.e-5) (Gain_Register 4) (VrefDQ_Register 35) (DFE_Index (1 4) (2 1) (3 4) (4 3)) ) (DDR5_DQ_Write_Generic_Tx (BER_Requested 1.e-5) (Gain_Value 1.2) (VrefDQ_Value 0.8) (DFE_Coefficient (1 -.3) (2 .05) (3 .04) (4 .03)) ) 4
What the Rx Tells the Tx Each Time (DDR5_DQ_Write_JEDEC_Rx (BER_Used 1.e-5) (Gain_Value 1.2) (VrefDQ_Value 0.8) (DFE_Index (1 4) (2 1) (3 4) (4 3)) (DFE_Coefficient (1 -.3) (2 .05) (3 .04) (4 .03)) (Metric (Height .055)(Width 120.e-12)(Area 5.e-12)(COM 14.7)) ) (DDR5_DQ_Write_Generic_Rx (BER_ Used 1.e-5) (Gain_Register 4) (Gain_Value 1.2) (VrefDQ_Register 35) (VrefDQ_Value 0.8) (DFE_Index (1 4) (2 1) (3 4) (4 3)) (DFE_Coefficient (1 -.3) (2 .05) (3 .04) (4 .03)) (Metric (Height .055)(Width 120.e-12)(Area 5e-12)(COM 14.7)) ) 5
optPulseMetric: MATLAB Function That Calculates Standard Metrics From A Pulse Response. MathWorks Plans To Put This Algorithm and MATLAB Code In Public Domain 6
Next Steps IBIS has left open how BCI Protocols are: Published Approved Amended I would like to proceed by documenting these two protocols, working out the document in IBIS-ATM, and publishing the document in the Open Forum. The Open Forum will decide if it just posts BCI protocols or agree to a mechanism to approve BCI protocols. 7
