Functional Description
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3. Primary Detection
Secondary Detection (to distinguish between a Charging Downstream Port and a Dedicated Charging
Port) is a newly added feature of the v1.2 spec and is not implemented in the charger detection state
machine.
9.2.4.4.3 Ethernet MII Mode Selection
The control module provides a mechanism to select the Mode of operation of Ethernet MII interface. The
GMII_SEL register has register bit fields to select the MII/RMII/RGMII modes, clock sources, and delay
mode.
9.2.4.4.4 Ethernet Module Reset Isolation Control
This feature allows the device to undergo a warm reset without disrupting the switch or traffic being routed
through the switch during the reset condition. The CPSW Reset Isolation register (RESET_ISO) has an
ISO_CONTROL field which controls the reset isolation feature.
If the reset isolation is enabled, any warm reset source will be blocked to the EMAC switch. If the EMAC
reset isolation is NOT active (default state), then the warm reset sources are allowed to propagate as
normal including to the EMAC Switch module (both reset inputs to the IP). All cold or POR resets will
always propagate to the EMAC switch module as normal.
When RESET_ISO is enabled, the following registers will not be disturbed by a warm reset:
• GMII_SEL
• CONF_GPMC_A[11:0]
• CONF_GPMC_WAIT0
• CONF_GPMC_WPN
• CONF_GPMC_BEN1
• CONF_MII1_COL
• CONF_MII1_CRS
• CONF_MII1_RX_ER
• CONF_MII1_TX_EN
• CONF_MII1_RX_DV
• CONF_MII1_TXD[3:0]
• CONF_MII1_TX_CLK
• CONF_MII1_RX_CLK
• CONF_MII1_RXD[3:0]
• CONF_RMII1_REF_CLK
• CONF_MDIO_DATA
• CONF_MDIO_CLK
752
Control Module SPRUH73H–October 2011–Revised April 2013
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