Multicore Fixed and Floating-Point System-on-Chip
Copyright 2012 Texas Instruments Incorporated
TMS320C6670 Peripheral Information and Electrical Specifications
209
SPRS689D—March 2012
TMS320C6670
7.20 Management Data Input/Output (MDIO)
The management data input/output (MDIO) module implements the 802.3 serial management interface to
interrogate and controls up to 32 Ethernet PHY(s) connected to the device, using a shared two-wire bus. Application
software uses the MDIO module to configure the auto-negotiation parameters of each PHY attached to the EMAC,
retrieve the negotiation results, and configure required parameters in the to gigabit Ethernet (GbE) switch
subsystem for correct operation. The module is designed to allow almost transparent operation of the MDIO
interface, with very little attention from the CorePac. For more information, see the
Gigabit Ethernet (GbE) Switch
Subsystem for KeyStone Devices User Guide
in
2.9 ‘‘Related Documentation from Texas Instruments’’ on page 66
Figure 7-50
MDIO Input Timing
Figure 7-51
MDIO Output Timing
Table 7-77
MDIO Timing Requirements
(see
No.
Min
Max
Unit
1
tc(MDCLK)
Cycle time, MDCLK
400
ns
2
tw(MDCLKH)
Pulse duration, MDCLK high
180
ns
3
tw(MDCLKL)
Pulse duration, MDCLK low
180
ns
4
tsu(MDIO-MDCLKH)
Setup time, MDIO data input valid before MDCLK high
10
ns
5
th(MDCLKH-MDIO)
Hold time, MDIO data input valid after MDCLK high
10
ns
tt(MDCLK)
Transition time, MDCLK
5
ns
End of Table 7-77
Table 7-78
MDIO Switching Characteristics
(see
No.
Parameter
Min
Max
Unit
6
td(MDCLKL-MDIO)
Delay time, MDCLK low to MDIO data output valid
100
ns
End of Table 7-78
MDI
O
(Input)
5
1
4
MDCLK
2
3
MDI
O
(
O
uput)
1
6
MDCLK
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