DP83869HM: DP83869HM

Vishnu vs

Prodigy 10 points

Part Number: DP83869HM
Other Parts Discussed in Thread: DP83869

Tool/software:

Input to the DP83869HM is MII.How its connection make?please provide details as soon as possible

5 months ago

0 David (ASIC) Liu 5 months ago

TI__Guru**** 176811 points

Hi,

Please see section 7.4.5 Media Independent Interface (MII) of the DP83869HM datasheet for the MII implementation.

We also have a schematic checklist. This is a comprehensive guide to ensure that all portions of the system are following TI recommendations per datasheet. I would encourage you to evaluate your design against this file.

snlr051.zip

Thanks

David

0 Vishnu vs 5 months ago in reply to David (ASIC) Liu

Prodigy 10 points

HOW INPUTS TX0- TX3 AND RX0-RX3 CONNECTED TO DP83869H? RX3 AND RX2 SHOWS OPEN .MEANS NO CONNECTION?and in MII MODE INPUT TO DP83869H IS MII THEN OUTPUT OF DP83869H IS IN WHAT FORM?

0 Vishnu vs 5 months ago in reply to David (ASIC) Liu

Prodigy 10 points

MII INTERFACE TO DP83869H MEANS MII TO PHY?

0 David (ASIC) Liu 5 months ago in reply to Vishnu vs

TI__Guru**** 176811 points

Hi,

MII Interface is the interface between the PHY (DP83869) and the MAC. The PHY output is MDI in 100M and 10M speeds. You will have to ensure that the PHY links in either 100Mbps or 10Mbps mode.

I am not clear on what you mean by RX2 and RX3 shows open, can you please clarify your question?

Thanks

David

0 Vishnu vs 5 months ago in reply to David (ASIC) Liu

Prodigy 10 points

IN 7.4.5 Media Independent Interface (MII) of the DP83869HM datasheet for the MII implementation. TABLE shows

. Strap Table for MII Mode PIN NAME STRAP NAME PIN # PIN STRAP CONNECTION JTAG_TDO / GPIO_1 OPMODE_0 22 OPEN RX_D3 OPMODE_1 36 MII to Copper: OPEN MII to Fiber: 2.49kΩ Pull-up to VDDIO RX_D2 OPMODE_2 35 OPEN

please refer Table 7-6 shows RX2 and RX3 shows open

0 David (ASIC) Liu 5 months ago in reply to Vishnu vs

TI__Guru**** 176811 points

Hi,

For MII to Copper Mode, you will leave RX_D2 and RX_D3 open.

Thanks

David

0 Vishnu vs 5 months ago in reply to David (ASIC) Liu

Prodigy 10 points

is no any extra setting in harware for MII setting?

0 David (ASIC) Liu 5 months ago in reply to Vishnu vs

TI__Guru**** 176811 points

Hi,

Steps to configure DP83869HM to MII Mode:

1. Write Reg 0x18 = 0xE

2. Choose MDI Interface

a. Copper: i. Write Reg 0x1DF = 0x60

b. Fiber: i. Write Reg 0x1DF = 0x62

3. Strap DP83869HM according to Table 7-6 of the DP83869 datasheet.

Thanks

David

0 Vishnu vs 5 months ago in reply to David (ASIC) Liu

Prodigy 10 points

My doubt is, in data sheet showing MII input to dp83869HM -TX0 TO TX3 and RX0 TO RX3 directly connect to CONTROLLER TX0 TO TX3 AND RX0 TO RX3..BUT IN STRAP SETTING of MII its showing rx2 and rx3 to be open...this point i cant under stand.Pls clarify this point

0 Vishnu vs 5 months ago in reply to David (ASIC) Liu

Prodigy 10 points

Do you have any schematic diagram?

0 David (ASIC) Liu 5 months ago in reply to Vishnu vs

TI__Guru**** 176811 points

Hi,

The RX_D2 and RX_D3 serve both as data pins and strap pins. As data pins, you would still connect all four RX[3:0] to the MAC. But as strap pins, you will leave them open (no pullup or pulldown) for the MII to Cooper mode.

For schematic, please see this link, https://www.ti.com/tool/DP83869EVM.

Thanks

David

0 Vishnu vs 5 months ago in reply to David (ASIC) Liu

Prodigy 10 points

Thank u.I will check above attached schematic link

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DP83869HM: DP83869HM