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AM5718: IODELAYCONFIG register question

Shinji Ueda
Expert 5440 points
Part Number: AM5718
Other Parts Discussed in Thread: AM5728, , TMDXIDK5718, TMDSEVM572X, TMDSCM572X

Hi champs,

I have a question about 'IODELAYCONFIG' register.

TRM 

P.4137 18.4.6.1.6 Manual IO Timing Modes
and
P.4139 18.4.6.1.8 IO Delay Recalibration

There is a 'IODELAYCONFIG'.

Is this calibration a recognition determined at the time of shipment?
Or is it updating every time the power is turned on?

Please let me know.

Regards,
Shinji Ueda

  • 0
    TI__Guru**** 393215 points
    Hi,

    The IODELAYCONFIG registers are used in manual IO timing modes. They must be loaded with the calculated values at device boot time. See this document for more details: www.ti.com/.../sprac44a.pdf
  • 0 in reply to Biser Gatchev-XID
    TI__Expert 5440 points
    Biser-san,

    Thank you for your answer.
    I have a one more question.

    Please teach me the difference in value.
    in muxdata.h file, iodelay_cfg_array_x15_sr2_0[] CFG_RGMII0xxxx value
    and
    In datasheet, CFG_RGMII0xxx value

    Regards,
    Shinji Ueda
  • 0 in reply to Shinji Ueda
    TI__Guru**** 161600 points

    Hi,

    Could you elaborate which SDK are you using?

    I am checking TI Processor SDK Linux 04.02.00.09 and the values (a_delay & g_delay) for RGMII0 are the same as datasheet:

    {0x06F0, 260, 0}, /* CFG_RGMII0_RXC_IN */

    {0x06FC, 0, 1412}, /* CFG_RGMII0_RXCTL_IN */

    {0x0708, 123, 1047}, /* CFG_RGMII0_RXD0_IN */

    {0x0714, 139, 1081}, /* CFG_RGMII0_RXD1_IN */

    {0x0720, 195, 1100}, /* CFG_RGMII0_RXD2_IN */

    {0x072C, 239, 1216}, /* CFG_RGMII0_RXD3_IN */

    {0x0740, 89, 0}, /* CFG_RGMII0_TXC_OUT */

    {0x074C, 15, 125}, /* CFG_RGMII0_TXCTL_OUT */

    {0x0758, 339, 162}, /* CFG_RGMII0_TXD0_OUT */

    {0x0764, 146, 94}, /* CFG_RGMII0_TXD1_OUT */

    {0x0770, 0, 27}, /* CFG_RGMII0_TXD2_OUT */

    {0x077C, 291, 205}, /* CFG_RGMII0_TXD3_OUT */

    Here is a screenshot from the datasheet:

    Or have I misunderstood the question and looking at something else?

    Best Regards,
    Yordan

  • 0 in reply to Yordan Kovachev
    TI__Guru**** 161600 points

    OK, sorry I was looking at AM5728 sources.

    For AM5718 device you should look at iodelay_cfg_array_am571x_idk[]:
    {0x06F0, 413, 0}, /* CFG_RGMII0_RXC_IN */
    {0x06FC, 27, 2296}, /* CFG_RGMII0_RXCTL_IN */
    {0x0708, 3, 1721}, /* CFG_RGMII0_RXD0_IN */
    {0x0714, 134, 1786}, /* CFG_RGMII0_RXD1_IN */
    {0x0720, 40, 1966}, /* CFG_RGMII0_RXD2_IN */
    {0x072C, 0, 2057}, /* CFG_RGMII0_RXD3_IN */
    {0x0740, 0, 60}, /* CFG_RGMII0_TXC_OUT */
    {0x074C, 0, 60}, /* CFG_RGMII0_TXCTL_OUT */
    {0x0758, 0, 60}, /* CFG_RGMII0_TXD0_OUT */
    {0x0764, 0, 0}, /* CFG_RGMII0_TXD1_OUT */
    {0x0770, 0, 60}, /* CFG_RGMII0_TXD2_OUT */
    {0x077C, 0, 120}, /* CFG_RGMII0_TXD3_OUT */

    The above values match Table 7-85. Manual Functions Mapping for GMAC RGMII0 in AM5718 TRM.

    The AM571x IDK is the correct reference design for AM5718 SoCs, see the product page (tools & software tab):
    www.ti.com/.../toolssoftware
    AM571x Industrial Development Kit (IDK)     TMDXIDK5718              Development Kits
    AM572x Evaluation Module                             TMDSEVM572X            Evaluation Modules & Boards
    AM57x IDK LCD Kit                                            TMDXIDK57X-LCD      Development Kits
    TMDSEVM572x Camera Module                    TMDSCM572X              Evaluation Modules & Boards

    Best Regards,
    Yordan