Texas Instruments SM320C6455-EP manual EMAC/MDIO Multiplexed Pins MII, RMII, and Gmii Modes, Rmii

Models: SM320C6455-EP

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SM320C6455-EP

FIXED-POINT DIGITAL SIGNAL PROCESSOR

www.ti.com

SPRS462B – SEPTEMBER 2007 – REVISED JANUARY 2008

Table 7-70. EMAC/MDIO Multiplexed Pins (MII, RMII, and GMII Modes)

BALL NUMBER

DEVICE PIN NAME

MII

RMII

GMII

 

 

(MAC_SEL =

(MAC_SEL =

(MAC_SEL =

 

 

00b)

01b)

10b)

J2

URDATA0/MRXD0/RMRXD0

MRXD0

RMRXD0

MRXD0

H3

URDATA1/MRXD1/RMRXD1

MRXD1

RMRXD1

MRXD1

J1

URDATA2/MRXD2

MRXD2

 

MRXD2

J3

URDATA3/MRXD3

MRXD3

 

MRXD3

L1

URDATA4/MRXD4

 

 

MRXD4

L2

URDATA5/MRXD5

 

 

MRXD5

H2

URDATA6/MRXD6

 

 

MRXD6

M2

URDATA7/MRXD7

 

 

MRXD7

M1

UXDATA0/MTXD0/RMTXD0

MTXD0

RMTXD0

MTXD0

L4

UXDATA1/MTXD1/RMTXD1

MTXD1

RMTXD1

MTXD1

M4

UXDATA2/MTXD2

MTXD2

 

MTXD2

K4

UXDATA3/MTXD3

MTXD3

 

MTXD3

L3

UXDATA4/MTXD4

 

 

MTXD4

L5

UXDATA5/MTXD5

 

 

MTXD5

M3

UXDATA6/MTXD6

 

 

MTXD6

N5

UXDATA7/MTXD7

 

 

MTXD7

H4

URSOC/MRXER/RMRXER

MRXER

RMRXER

MRXER

H5

URENB/MRXDV

MRXDV

 

MRXDV

J5

UXENB/MTXEN/RMTXEN

MTXEN

RMTXEN

MTXEN

J4

URCLAV/MCRS/RMCRSDV

MCRS

RMCRSDV

MCRS

K3

UXSOC/MCOL

MCOL

 

MCOL

K5

UXCLAV/GMTCLK

 

 

GMTCLK

H1

URCLK/MRCLK

MRCLK

 

MRCLK

N4

UXCLK/MTCLK/REFCLK

MTCLK

RMREFCLK

MTCLK

N3

UXADDR3/GMDIO

MDIO

MDIO

MDIO

M5

UXADDR4/GMDCLK

MDCLK

MDCLK

MDCLK

Using the RMII Mode of the EMAC

The Ethernet Media Access Controller (EMAC) contains logic that allows it to communicate using the Reduced Media Independent Interface (RMII) protocol. This logic must be taken out of reset before being used. To use the RMII mode of the EMAC follow these steps:

1.Enable the EMAC/MDIO through the Device State Control Registers.

Unlock the PERCFG0 register by writing 0x0F0A 0B00 to the PERLOCK register.

Set bit 4 in the PERCFG0 register within 16 SYSCLK3 clock cycles to enable the EMAC/MDIO.

Poll the PERSTAT0 register to verify state change.

2.Initialize the EMAC/MDIO as needed.

3.Release the RMII logic from reset by clearing the RMII_RST bit of the EMAC Configuration Register (see Section 3.4.5).

As described in the previous section, the RMII mode of the EMAC must be selected by setting MACSEL[1:0] = 01b at device reset.

202

C64x+ Peripheral Information and Electrical Specifications

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Texas Instruments SM320C6455-EP EMAC/MDIO Multiplexed Pins MII, RMII, and Gmii Modes, Ball Number Device PIN Name, Rmii