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Adventurer
Adventurer
667 Views
Registered: ‎02-12-2018

ISERDESE3 - Configuring it in DDR mode

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Hi,

Wondering how to configure ISERDESE3 in DDR mode. 

I don't see the parameter "DATA_RATE" found in ISERDESE2, which can be used to set the data rate to DDR or SDR.  Below is the ISERDESE3 instantiation template found in the library guide.

 

ISERDESE3 #(
.DATA_WIDTH(8), // Parallel data width (4,8)
.FIFO_ENABLE("FALSE"), // Enables the use of the FIFO
.FIFO_SYNC_MODE("FALSE"), // Enables the use of internal 2-stage synchronizers on the FIFO
.IS_CLK_B_INVERTED(1'b0), // Optional inversion for CLK_B
.IS_CLK_INVERTED(1'b0), // Optional inversion for CLK
.IS_RST_INVERTED(1'b0), // Optional inversion for RST
.SIM_DEVICE("ULTRASCALE") // Set the device version (ULTRASCALE, ULTRASCALE_PLUS, ULTRASCALE_PLUS_ES1,
// ULTRASCALE_PLUS_ES2)
) ISERDESE3_inst (
.FIFO_EMPTY(FIFO_EMPTY), // 1-bit output: FIFO empty flag
.INTERNAL_DIVCLK(INTERNAL_DIVCLK), // 1-bit output: Internally divided down clock used when FIFO is
// disabled (do not connect)
.Q(Q), // 8-bit registered output
.CLK(CLK), // 1-bit input: High-speed clock
.CLKDIV(CLKDIV), // 1-bit input: Divided Clock
.CLK_B(CLK_B), // 1-bit input: Inversion of High-speed clock CLK
.D(D), // 1-bit input: Serial Data Input
.FIFO_RD_CLK(FIFO_RD_CLK), // 1-bit input: FIFO read clock
.FIFO_RD_EN(FIFO_RD_EN), // 1-bit input: Enables reading the FIFO when asserted
.RST(RST) // 1-bit input: Asynchronous Reset
);

 

Thanks

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1 Solution

Accepted Solutions
Moderator
Moderator
642 Views
Registered: ‎08-08-2017

Re: ISERDESE3 - Configuring it in DDR mode

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Hi @xilinxmax

You must be knowing whether the incoming data is SDR or DDR.

If the Data is DDR  and required de-serialization ratio is 1:8,  CLK_DIV = CLK/4.

If the Data is DDR  and required de-serialization ratio is 1:4,  CLK_DIV = CLK/2.

In short if you know the data nature and set the DATA_WIDTH attribute and Derive the CLK_DIV properly, you will get the expected de-serialization  i.e there is no need to have DATA_RATE attribute explicitly.

Follow this table for desire de-serialization 

Capture.PNG

-----------------------------------------------------------------------------------------------------------------------

Reply if you have any queries , Give Kudos and accept as Solution

-----------------------------------------------------------------------------------------------------------------------

 

-------------------------------------------------------------------------------------------------------------------------------
Reply if you have any queries, give kudos and accept as solution
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View solution in original post

1 Reply
Moderator
Moderator
643 Views
Registered: ‎08-08-2017

Re: ISERDESE3 - Configuring it in DDR mode

Jump to solution

Hi @xilinxmax

You must be knowing whether the incoming data is SDR or DDR.

If the Data is DDR  and required de-serialization ratio is 1:8,  CLK_DIV = CLK/4.

If the Data is DDR  and required de-serialization ratio is 1:4,  CLK_DIV = CLK/2.

In short if you know the data nature and set the DATA_WIDTH attribute and Derive the CLK_DIV properly, you will get the expected de-serialization  i.e there is no need to have DATA_RATE attribute explicitly.

Follow this table for desire de-serialization 

Capture.PNG

-----------------------------------------------------------------------------------------------------------------------

Reply if you have any queries , Give Kudos and accept as Solution

-----------------------------------------------------------------------------------------------------------------------

 

-------------------------------------------------------------------------------------------------------------------------------
Reply if you have any queries, give kudos and accept as solution
-------------------------------------------------------------------------------------------------------------------------------

View solution in original post