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Honored Contributor
Honored ContributorDDR3 Uniphy- Hard memory controller with MPFE.
Hello,
I'm using Arria V GT dev kit, DDR3 SDRAM Uniphy IP, Hard memory controller with Multi port front end (MPFE). I'm using 2 ports, First port for Write_only and second port for read_only and trying to write some set of data to DDR memory with Burst lenth =8 and read back the same with BL=8. But i'm unable to read my data back, because data_valid signal never goes HIGH. I'm using Micron device= MT41J128M16HA-125D. 32MX16X8, 2GB, DDR Memory. ------------------------------------------------------------------------------------------------------------------------------------------------------- TEST- 1 write side => BL = 8, Data_write = 32 bit, write_request = 8 clk cycles, Byte_En = Fh , Burst_begin = 1 for one cycle at start of the burst and address ="0000000". Read side => BL=8, Data_read =32 bit, read_request = 8 clk cycles, Byr_En =Fh, Burst_begin =1 for one cycle at start of the address and address ="000000". Result => with read_request = 8 times(8 clk cycles) and BL= 8. I'm getting 64 times (64 clk cycles) of data valid. Im able to read my data along with some junk data. -------------------------------------------------------------------------------------------------------------------------------------------------------------- TEST- 2 Write side => same as TEST-1 read side => same as Test-1, but only 4 times read_request with BL= 8, then result => with read_request = 4 times(4 clk cycles) and BL= 8. I'm getting 32 times (32 clk cycles) of data valid. Im able to read my data along with some junk data. ----------------------------------------------------------------------------------------------------------------------------------------------------------------- TEST- 3 Write side => same as TEST-1 read side => same as Test-1, but only 2 times read_request with BL= 8, then result => with read_request = 2 times(2 clk cycles) and BL= 8. I'm getting 16 times (16 clk cycles) of data valid. Im able to read my data along with some junk data. --------------------------------------------------------------------------------------------------------------------------------------------------------------- TEST- 4 Write side => same as TEST-1 read side => same as Test-1, but only 1 time read_request with BL= 8, then result => with read_request = 1 time(1 clk cycle) and BL= 8. Data_valid signal never trigger. Data_read = "0000000000". so No data read . ---------------------------------------------------------------------------------------------------------------------------------------------------------- what could be the reason..?? If suppose I'm writing 32 bit of data, 8 times with BL=8, then while reading back How many times should i enable the read_request signal with BL=8...??
