SPRZ487F May   2022  – December 2024 AM620-Q1 , AM623 , AM625 , AM625-Q1 , AM625SIP

 

  1.   1
  2. 1Usage Notes and Advisories Matrices
    1. 1.1 Devices Supported
  3. 2Silicon Usage Notes and Advisories
    1. 2.1 Silicon Usage Notes
      1.      i2351
      2.      i2372
      3.      i2424
    2. 2.2 Silicon Advisories
      1.      i2049
      2.      i2062
      3.      i2097
      4.      i2103
      5.      i2134
      6.      i2189
      7.      i2196
      8.      i2232
      9.      i2244
      10.      i2310
      11.      i2311
      12.      i2327
      13.      i2328
      14.      i2279
      15.      i2307
      16.      i2320
      17.      i2329
      18.      i2208
      19.      i2249
      20.      i2278
      21.      i2312
      22.      i2366
      23.      i2371
      24.      i2253
      25.      i2283
      26.      i2383
      27.      i2401
      28.      i2407
      29.      i2409
      30.      i2410
      31.      i2413
      32.      i2414
      33.      i2415
      34.      i2416
      35.      i2417
      36.      i2418
      37.      i2419
      38.      i2420
      39.      i2421
      40.      i2422
      41.      i2423
      42.      i2435
      43.      i2431
  4.   Trademarks
  5.   Revision History

i2249

OSPI: Internal PHY Loopback and Internal Pad Loopback clocking modes with DDR timing inoperable

Details

The OSPI Internal PHY Loopback mode and Internal Pad Loopback mode uses “launch edge as capture edge” (same edge capture, or 0-cycle timing).

The programmable receive delay line (Rx PDL) is used to compensate for the round trip delay (Tx clock to Flash device, Flash clock to output and Flash data to Controller).

In the case of internal and IO loopback modes, the total delay of the Rx PDL is not sufficient to compensate for the round trip delay, and thus these modes cannot be used.

The table below describes the recommended clocking topologies in the OSPI controller. All other modes not described here are affected by the advisory in DDR mode and are not recommended clocking topologies.

Table 2-1 OSPI Clocking Topologies
Clocking Mode Terminology CONFIG_REG.PHY_MODE_ENABLE READ_DATA_CAPTURE.BYPASS READ_DATA_CAPTURE.DQS_EN Board implementation
No Loopback, no PHY 0 (PHY disabled) 1 (disable adapted loopback clock) X None. Relying on internal clock. Max freq 50MHz.
External Board Loopback with PHY 1 (PHY enabled) 0 (enable adapted loopback clock) 0 (DQS disabled) External Board Loopback (OSPI_LOOPBACK_CLK_SEL = 0)
DQS with PHY 1 (PHY enabled) X (DQS enable has priority) 1 (DQS enabled) Memory strobe connected to SOC DQS pin

Workaround

None. Please use one of the unaffected clocking modes based on the table in the description