STM32H7R7Z8 XSPI has timing issue in Quad mode
Hi, Everyone
I am trying to setup STM32H7R7Z8 XSPI2 in Quad mode for APS6404L-3SQR QSPI PSRAM.
The original code is generated from MX v6.116.1 and developed with IDE v2.0.0.
HW info:
- The PSRAM is connected to XSPI2 with NCS, CLK, IO0~3. There is no DQS pin (PSRAM does not support it).
- The XSPI2 is setup in 133MHz frequency PSRAM supported.
- APS6404L-3SQR: 133MHz for 32 Bytes Wrapped Burst, 64Mb, 8M x 8bits, pagesize 1024 bytes,
SW configuration:
/* XSPI2 parameter configuration */
hxspi2.Instance = XSPI2;
hxspi2.Init.FifoThresholdByte = 4;
hxspi2.Init.MemoryMode = HAL_XSPI_SINGLE_MEM;
hxspi2.Init.MemoryType = HAL_XSPI_MEMTYPE_APMEM_16BITS;
hxspi2.Init.MemorySize = HAL_XSPI_SIZE_64MB;
hxspi2.Init.ChipSelectHighTimeCycle = 2;
hxspi2.Init.FreeRunningClock = HAL_XSPI_FREERUNCLK_DISABLE;
hxspi2.Init.ClockMode = HAL_XSPI_CLOCK_MODE_0;
hxspi2.Init.WrapSize = HAL_XSPI_WRAP_32_BYTES;
hxspi2.Init.ClockPrescaler = 0;
hxspi2.Init.SampleShifting = HAL_XSPI_SAMPLE_SHIFT_HALFCYCLE;
hxspi2.Init.ChipSelectBoundary = HAL_XSPI_BONDARYOF_NONE;
hxspi2.Init.MaxTran = 0;
hxspi2.Init.Refresh = 0;
hxspi2.Init.MemorySelect = HAL_XSPI_CSSEL_NCS1;
if (HAL_XSPI_Init(&hxspi2) != HAL_OK)
{Error_Handler();}
sXspiManagerCfg.nCSOverride = HAL_XSPI_CSSEL_OVR_NCS1;
sXspiManagerCfg.IOPort = HAL_XSPIM_IOPORT_2;
sXspiManagerCfg.Req2AckTime = 1;
if (HAL_XSPIM_Config(&hxspi2, &sXspiManagerCfg, HAL_XSPI_TIMEOUT_DEFAULT_VALUE) != HAL_OK)
{Error_Handler();}
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/* memory manager: EXTMEMORY_1 */
extmem_list_config[0].MemType = EXTMEM_PSRAM;
extmem_list_config[0].Handle = (void*)&hxspi2;
extmem_list_config[0].ConfigType = EXTMEM_LINK_CONFIG_4LINES;
extmem_list_config[0].PsramObject.psram_public.MemorySize = HAL_XSPI_SIZE_64MB;
extmem_list_config[0].PsramObject.psram_public.FreqMax = 133 * 1000000u;
extmem_list_config[0].PsramObject.psram_public.NumberOfConfig = 0u;
/* Memory command configuration */
extmem_list_config[0].PsramObject.psram_public.ReadREG = 0u;
extmem_list_config[0].PsramObject.psram_public.WriteREG = 0u;
extmem_list_config[0].PsramObject.psram_public.ReadREGSize = 0u;
extmem_list_config[0].PsramObject.psram_public.REG_DummyCycle = 0u;
extmem_list_config[0].PsramObject.psram_public.Write_command = 0x38u;
extmem_list_config[0].PsramObject.psram_public.Write_DummyCycle = 0u;
extmem_list_config[0].PsramObject.psram_public.Read_command = 0xEBu;
extmem_list_config[0].PsramObject.psram_public.WrapRead_command = 0x00u;
extmem_list_config[0].PsramObject.psram_public.Read_DummyCycle = 6u;
EXTMEM_Init(EXTMEMORY_1, HAL_RCCEx_GetPeriphCLKFreq(RCC_PERIPHCLK_XSPI2));When system startup, the SW can properly initializes the PSRAM with reset, toggle-burst-boundary(chip specific feature), readID and enabled to memory-mapped mode successfully. Below image shows the registers after init:
According to Errata: 2.4.1 Memory-mapped write error response when DQS output is disable
Description: If the DQSE control bit of the XSPI_WCCR register is cleared for memories without DQS pin, it results in an error response for every memory-mapped write request.
Workaround: When doing memory-mapped writes, set the DQSE bit of the XSPI_WCCR register, even for memories that have no DQS pin.
So I did "commandBase.DQSMode = HAL_XSPI_DQS_ENABLE" for memory-mapped write instruction.
Problem:
In memory-mapped mode, SW try to write 0x55 to RAM from start-address 0x70000000 and then read back for verification.
- The verification is success at beginning 24KB size - whatever the start-address is.
- After 24KB, the verification is failed time to time. And errors happen more if read run more time.
- The MCU hangup with free-run-read through whole PSRAM size.
It seems the XSPI has timing drift problem. Does anyone get the problem?
Question: Does XSPI support Quad mode for PSRAM without DQS pin?