TMS320TCI6614 Datasheet, PDF (176/188 Pages) Texas Instruments – Communications Infrastructure KeyStone SoC

TMS320TCI6614
Communications Infrastructure KeyStone SoC
SPRS671—June 2011
8.20 Management Data Input/Output (MDIO)
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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 EMAC module for correct operation. The
module is designed to allow almost transparent operation of the MDIO interface, with very little maintenance from
the core processor. For more information, see the Ethernet Media Access Control (EMAC) for KeyStone Devices User
Guide in2.8 ‘‘Related Documentation from Texas Instruments’’ on page 37.
Table 8-86 MDIO Timing Requirements
(see Figure 8-51)
No.
1
tc(MDCLK)
Cycle time, MDCLK
tw(MDCLKH)
Pulse duration, MDCLK high
tw(MDCLKL)
Pulse duration, MDCLK low
4
tsu(MDIO-MDCLKH) Setup time, MDIO data input valid before MDCLK high
5
th(MDCLKH-MDIO) Hold time, MDIO data input valid after MDCLK high
tt(MDCLK)
End of Table 8-86
Transition time, MDCLK
Min
Max
Unit
400
ns
180
ns
180
ns
10
ns
10
ns
5
ns
Figure 8-51 MDIO Input Timing
MDCLK
MDIO
(Input)
1
4
Table 8-87 MDIO Switching Characteristics
(see Figure 8-52)
No.
7
td(MDCLKL-MDIO)
End of Table 8-87
Parameter
Delay time, MDCLK low to MDIO data output valid
Figure 8-52 MDIO Output Timing
MDCLK
MDIO
(Ouput)
1
7
5
Min
Max
Unit
100
ns
176
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