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Adventurer
Adventurer
622 Views
Registered: ‎10-09-2018

true dual port BRAM Read operation

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Hello,

I have some doubts in READ operation of TDP BRAM.

 
	 RAMB16BWER_inst : RAMB16BWER
generic map (
-- DATA_WIDTH_A/DATA_WIDTH_B: 0, 1, 2, 4, 9, 18, or 36
DATA_WIDTH_A => 36,
DATA_WIDTH_B => 36,
-- DOA_REG/DOB_REG: Optional output register (0 or 1)
DOA_REG => 0,
DOB_REG => 0,
-- EN_RSTRAM_A/EN_RSTRAM_B: Enable/disable RST
EN_RSTRAM_A => TRUE,
EN_RSTRAM_B => TRUE,
-- INITP_00 to INITP_07: Initial memory contents.
INITP_00 => X"0000000000000000000000000000000000000000000000000000000000000000",
INITP_01 => X"0000000000000000000000000000000000000000000000000000000000000000",
INITP_02 => X"0000000000000000000000000000000000000000000000000000000000000000",
INITP_03 => X"0000000000000000000000000000000000000000000000000000000000000000",
INITP_04 => X"0000000000000000000000000000000000000000000000000000000000000000",
INITP_05 => X"0000000000000000000000000000000000000000000000000000000000000000",
INITP_06 => X"0000000000000000000000000000000000000000000000000000000000000000",
INITP_07 => X"0000000000000000000000000000000000000000000000000000000000000000",
-- INIT_00 to INIT_3F: Initial memory contents.
INIT_00 => X"0000000000000000000000000000000000000000000000000000000000001001",
INIT_01 => X"0000000000000000000000000000000000000000000000000000000000000010",
INIT_02 => X"0000000000000000000000000000000000000000000000000000000000001010",
INIT_03 => X"0000000000000000000000000000000000000000000000000000000000000000",
INIT_04 => X"0000000000000000000000000000000000000000000000000000000000000000",
INIT_05 => X"0000000000000000000000000000000000000000000000000000000000000000",
INIT_06 => X"0000000000000000000000000000000000000000000000000000000000000000",
INIT_07 => X"0000000000000000000000000000000000000000000000000000000000000000",
INIT_08 => X"0000000000000000000000000000000000000000000000000000000000000000",
INIT_09 => X"0000000000000000000000000000000000000000000000000000000000000000",
INIT_0A => X"0000000000000000000000000000000000000000000000000000000000000000",
INIT_0B => X"0000000000000000000000000000000000000000000000000000000000000000",
INIT_0C => X"0000000000000000000000000000000000000000000000000000000000000000",
INIT_0D => X"0000000000000000000000000000000000000000000000000000000000000000",
INIT_0E => X"0000000000000000000000000000000000000000000000000000000000000000",
INIT_0F => X"0000000000000000000000000000000000000000000000000000000000000000",
INIT_10 => X"0000000000000000000000000000000000000000000000000000000000000000",
INIT_11 => X"0000000000000000000000000000000000000000000000000000000000000000",
INIT_12 => X"0000000000000000000000000000000000000000000000000000000000000000",
INIT_13 => X"0000000000000000000000000000000000000000000000000000000000000000",
INIT_14 => X"0000000000000000000000000000000000000000000000000000000000000000",
INIT_15 => X"0000000000000000000000000000000000000000000000000000000000000000",
INIT_16 => X"0000000000000000000000000000000000000000000000000000000000000000",
INIT_17 => X"0000000000000000000000000000000000000000000000000000000000000000",
INIT_18 => X"0000000000000000000000000000000000000000000000000000000000000000",
INIT_19 => X"0000000000000000000000000000000000000000000000000000000000000000",
INIT_1A => X"0000000000000000000000000000000000000000000000000000000000000000",
INIT_1B => X"0000000000000000000000000000000000000000000000000000000000000000",
INIT_1C => X"0000000000000000000000000000000000000000000000000000000000000000",
INIT_1D => X"0000000000000000000000000000000000000000000000000000000000000000",
INIT_1E => X"0000000000000000000000000000000000000000000000000000000000000000",
INIT_1F => X"0000000000000000000000000000000000000000000000000000000000000000",
INIT_20 => X"0000000000000000000000000000000000000000000000000000000000000000",
INIT_21 => X"0000000000000000000000000000000000000000000000000000000000000000",
INIT_22 => X"0000000000000000000000000000000000000000000000000000000000000000",
INIT_23 => X"0000000000000000000000000000000000000000000000000000000000000000",
INIT_24 => X"0000000000000000000000000000000000000000000000000000000000000000",
INIT_25 => X"0000000000000000000000000000000000000000000000000000000000000000",
INIT_26 => X"0000000000000000000000000000000000000000000000000000000000000000",
INIT_27 => X"0000000000000000000000000000000000000000000000000000000000000000",
INIT_28 => X"0000000000000000000000000000000000000000000000000000000000000000",
INIT_29 => X"0000000000000000000000000000000000000000000000000000000000000000",
INIT_2A => X"0000000000000000000000000000000000000000000000000000000000000000",
INIT_2B => X"0000000000000000000000000000000000000000000000000000000000000000",
INIT_2C => X"0000000000000000000000000000000000000000000000000000000000000000",
INIT_2D => X"0000000000000000000000000000000000000000000000000000000000000000",
INIT_2E => X"0000000000000000000000000000000000000000000000000000000000000000",
INIT_2F => X"0000000000000000000000000000000000000000000000000000000000000000",
INIT_30 => X"0000000000000000000000000000000000000000000000000000000000000000",
INIT_31 => X"0000000000000000000000000000000000000000000000000000000000000000",
INIT_32 => X"0000000000000000000000000000000000000000000000000000000000000000",
INIT_33 => X"0000000000000000000000000000000000000000000000000000000000000000",
INIT_34 => X"0000000000000000000000000000000000000000000000000000000000000000",
INIT_35 => X"0000000000000000000000000000000000000000000000000000000000000000",
INIT_36 => X"0000000000000000000000000000000000000000000000000000000000000000",
INIT_37 => X"0000000000000000000000000000000000000000000000000000000000000000",
INIT_38 => X"0000000000000000000000000000000000000000000000000000000000000000",
INIT_39 => X"0000000000000000000000000000000000000000000000000000000000000000",
INIT_3A => X"0000000000000000000000000000000000000000000000000000000000000000",
INIT_3B => X"0000000000000000000000000000000000000000000000000000000000000000",
INIT_3C => X"0000000000000000000000000000000000000000000000000000000000000000",
INIT_3D => X"0000000000000000000000000000000000000000000000000000000000000000",
INIT_3E => X"0000000000000000000000000000000000000000000000000000000000000000",
INIT_3F => X"0000000000000000000000000000000000000000000000000000000000000000",
-- INIT_A/INIT_B: Initial values on output port
INIT_A => X"000000000",
INIT_B => X"000000000",
-- INIT_FILE: Optional file used to specify initial RAM contents
INIT_FILE => "NONE",
-- RSTTYPE: "SYNC" or "ASYNC"
RSTTYPE => "SYNC",
-- RST_PRIORITY_A/RST_PRIORITY_B: "CE" or "SR"
RST_PRIORITY_A => "SR",
RST_PRIORITY_B => "SR",
-- SIM_COLLISION_CHECK: Collision check enable "ALL", "WARNING_ONLY", "GENERATE_X_ONLY" or "NONE"
SIM_COLLISION_CHECK => "ALL",
-- SIM_DEVICE: Must be set to "SPARTAN6" for proper simulation behavior
SIM_DEVICE => "SPARTAN6",
-- SRVAL_A/SRVAL_B: Set/Reset value for RAM output
SRVAL_A => X"000000000",
SRVAL_B => X"000000000",
-- WRITE_MODE_A/WRITE_MODE_B: "WRITE_FIRST", "READ_FIRST", or "NO_CHANGE"
WRITE_MODE_A => "WRITE_FIRST",
WRITE_MODE_B => "WRITE_FIRST"
)

I am writng data into mem location and then trying to read same data from same port, but data is not coming as expected.

I have attached tb_code and waveform.

tb_code.jpg
tb.jpg
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1 Solution

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Adventurer
Adventurer
545 Views
Registered: ‎10-09-2018

Re: true dual port BRAM Read operation

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Hi @pthakare 

Earlier it was working as 2 separate ports for write and read, but i have changed in user logic code so only one port( lets say A) is getting use with PCIe and another is free. So i can work with FPGA with that port.

BRAM address should be assign as  =>addr &"00000";

It was a problem,I missed that. Took care.

Thanks!

View solution in original post

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2 Replies
Moderator
Moderator
567 Views
Registered: ‎08-08-2017

Re: true dual port BRAM Read operation

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Hi @avinashc 

Thanks for sharing the primitive instatiation in new thread. Let me simulate this at my end and get back to you.

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Highlighted
Adventurer
Adventurer
546 Views
Registered: ‎10-09-2018

Re: true dual port BRAM Read operation

Jump to solution

Hi @pthakare 

Earlier it was working as 2 separate ports for write and read, but i have changed in user logic code so only one port( lets say A) is getting use with PCIe and another is free. So i can work with FPGA with that port.

BRAM address should be assign as  =>addr &"00000";

It was a problem,I missed that. Took care.

Thanks!

View solution in original post

0 Kudos