hi,
i'm doing a design using I.MX6DQ.
what's impedance of the RGMII interface in I.MX6 chip?
does it need to add termination resistor on the RGMII tx signals?
I notice the Sabre board does not use them.
but i didn't any information in the datasheet.
thanks
Solved! Go to Solution.
Driver strength and ODT of RGMII signals are configurable.
Please refer to section 36.4.487 [Pad Group Control Register
(IOMUXC_SW_PAD_CTL_GRP_RGMII_TERM)] and of the i.MX6 DQ RM.
“Drive strength Controlled by bits [5:3] (DSE) of the following registers
in IOMUXC (IOMUX controller):
IOMUXC_SW_PAD_CTL_PAD_RGMII_TXC
IOMUXC_SW_PAD_CTL_PAD_RGMII_TX_CTL
IOMUXC_SW_PAD_CTL_PAD_RGMII_TDx (4 registers)
IOMUXC_SW_PAD_CTL_PAD_RGMII_RXC
IOMUXC_SW_PAD_CTL_PAD_RGMII_RX_CTL
IOMUXC_SW_PAD_CTL_PAD_RGMII_RDx (4 registers)”
http://cache.freescale.com/files/32bit/doc/ref_manual/IMX6DQRM.pdf
Termination resistors are not recommended.
Also, please refer to section 9.5.1.2 (RGMII) of the “Hardware Development Guide for i.MX 6 …”
regarding IBIS model.
http://cache.freescale.com/files/32bit/doc/user_guide/IMX6DQ6SDLHDG.pdf
Have a great day,
Yuri
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------
Driver strength and ODT of RGMII signals are configurable.
Please refer to section 36.4.487 [Pad Group Control Register
(IOMUXC_SW_PAD_CTL_GRP_RGMII_TERM)] and of the i.MX6 DQ RM.
“Drive strength Controlled by bits [5:3] (DSE) of the following registers
in IOMUXC (IOMUX controller):
IOMUXC_SW_PAD_CTL_PAD_RGMII_TXC
IOMUXC_SW_PAD_CTL_PAD_RGMII_TX_CTL
IOMUXC_SW_PAD_CTL_PAD_RGMII_TDx (4 registers)
IOMUXC_SW_PAD_CTL_PAD_RGMII_RXC
IOMUXC_SW_PAD_CTL_PAD_RGMII_RX_CTL
IOMUXC_SW_PAD_CTL_PAD_RGMII_RDx (4 registers)”
http://cache.freescale.com/files/32bit/doc/ref_manual/IMX6DQRM.pdf
Termination resistors are not recommended.
Also, please refer to section 9.5.1.2 (RGMII) of the “Hardware Development Guide for i.MX 6 …”
regarding IBIS model.
http://cache.freescale.com/files/32bit/doc/user_guide/IMX6DQ6SDLHDG.pdf
Have a great day,
Yuri
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------