Information
Enhanced Three-Speed Ethernet Controllers
MPC8308 PowerQUICC II Pro Processor Reference Manual, Rev. 1
Freescale Semiconductor 16-31
Table 16-12 lists the different interface configurations indicated by registers, ECNTRL and MACCFG2.
16.5.3.1.7 Pause Time Value Register (PTV)
PTV is a 32-bit register written by the user to store the pause duration used when the eTSEC initiates an
IEEE 802.3 PAUSE control frame through TCTRL[TFC_PAUSE]. The low-order 16 bits (PT) represent
the pause time and the high-order 16 bits (PTE) represent the extended pause control parameter. The pause
time is measured in units of pause_quanta, equal to 512 bit times. The pause time can range from 0 to
65,535 pause_quanta, or 0 to 33,553,920 bit times. See Section 16.6.2.8, “Flow Control,” for additional
details. Figure 16-8 describes the definition for the PTV register.
19 STEN MIB counter statistics enabled.
0 Statistics not enabled
1 Enables internal counters to update
This is a steady state signal and must be set prior to enabling the Ethernet controller and must not be
changed without proper care.
20–24 — Reserved
25 GMIIM GMII interface mode. If this bit is set, a PHY with a RGMII interface is expected to be connected. If
cleared, a PHY with an MII interface is expected. The user should then set MACCFG2[I/F Mode]
accordingly. The state of this status bit is defined during power-on reset. See Section 4.3.2, “Reset
Configuration Words.”
0 MII mode interface expected
1 RGMII mode interface expected
26 — Reserved
27 RPM Reduced-pin mode for Gigabit interfaces. If this bit is set, a reduced-pin interface is expected on
Ethernet interfaces. This register can be pin-configured at reset to 0 or 1.
0 MII in non-reduced-pin mode configuration
1 RGMII reduced-pin mode
28 R100M RGMII 100 mode. This bit is ignored unless RPM are set and MACCFG2[I/F Mode] is assigned to
10/100 (01).
0 RGMII is in 10 Mbps mode
1 RGMII is in 100 Mbps mode
29–31 — Reserved
Table 16-12. eTSEC Interface Configurations
Interface Mode
ECNTRL Field MACCFG2 Field
GMIIM RPM R100M I/F Mode
RGMII 1 Gbps 1 1 0 10
RGMII 100 Mbps 1 1 1 01
RGMII 10 Mbps 1 1 0 01
MII 10/100 Mbps 0 0 0 01
Table 16-11. ECNTRL Field Descriptions (continued)
Bits Name Description