DP83822H: LED_1 Blink Rate

PY (Pengyu) Song

Expert 5860 points

Part Number: DP83822H

Hi team,

Can LEDCR register be used to configure blink rate of LED_1 as shown below? Datasheet only has LED_0.

over 3 years ago

0 Gerome Cacho over 3 years ago

TI__Mastermind 39755 points

Hello,

Unfortunately, we do not have this setting available.

Sincerely,

Gerome

0 PY (Pengyu) Song over 3 years ago in reply to Gerome Cacho

TI__Expert 5860 points

Hi Gerome,

Just to confirm, are you saying blinking rate for LED_1 can't be configured? Then what is the LED_1 blinking rate?

0 Gerome Cacho over 3 years ago in reply to PY (Pengyu) Song

TI__Mastermind 39755 points

Hello,

This is a speed indicator. This signal will not blink. Instead, it will be on if speed is 100mbps, while it will be off for 10mbps.

Sincerely,

Gerome

0 PY (Pengyu) Song over 3 years ago in reply to Gerome Cacho

TI__Expert 5860 points

Hi Gerome,

For LED_1, if it is configured as RX/TX Activity, will it not blink??

0 Gerome Cacho over 3 years ago in reply to PY (Pengyu) Song

TI__Mastermind 39755 points

Hello,

Thank you for your query. Let me get back to the team regarding this new information. I expect to get back to you early next week.

Sincerely,

Gerome

0 PY (Pengyu) Song over 3 years ago in reply to Gerome Cacho

TI__Expert 5860 points

Hi Gerome,

Thanks. Will wait for your feedback.

Just to add on, basically prefer to set the device in below configuration - can you please advise if below configuration can be done and what are the registers need to be set to achieve below configuration? Thanks!

LED_0: configure for Link OK – 0000 in MLEDCR [6:3].
LED_1: configure for TX/RX activity with blinking, prefer 10Hz blink rate – 0001 in LEDCFG1 [11:8].

0 Gerome Cacho over 3 years ago in reply to PY (Pengyu) Song

TI__Mastermind 39755 points

Hi,

We cannot find the specific register for LED1 blink rate control. However, in terms of your configuration, you can set these settings and see if they meet your expectations visually.

Sincerely,

Gerome

0 PY (Pengyu) Song over 3 years ago in reply to Gerome Cacho

TI__Expert 5860 points

Hi Gerome,

Can BU team help test out the proposed configuration since datasheet is not clear on this? Customer is studying the part and they can't test it right now.

0 Gerome Cacho over 3 years ago in reply to PY (Pengyu) Song

TI__Mastermind 39755 points

Hi PY,

Why cant customer use LED_0 as activity so they have access to blink rate configurability, and then use LED_1 as link?

Sincerely,

Gerome

0 PY (Pengyu) Song over 3 years ago in reply to Gerome Cacho

TI__Expert 5860 points

Hi Gerome,

1. your suggestion can be discussed with customer but this may or may not be accepted - depending if customer need to follow the same setting as prior gen.

2. more importantly, the datasheet is not clear on the configuration and we need your make such clarifications. this should not depend on the outcome of point #1.

Again, can you please advise if below configuration can be done and what are the registers need to be set to achieve below configuration?

LED_0: configure for Link OK – 0000 in MLEDCR [6:3].
LED_1: configure for TX/RX activity with blinking, prefer 10Hz blink rate – 0001 in LEDCFG1 [11:8].

0 Gerome Cacho over 3 years ago in reply to PY (Pengyu) Song

TI__Mastermind 39755 points

Hi PY,

Please let me get back to you with a response later this week.

Sincerely,

Gerome

0 PY (Pengyu) Song over 3 years ago in reply to Gerome Cacho

TI__Expert 5860 points

Hi Gerome,

Any update? Thanks.

+1 Gerome Cacho over 3 years ago in reply to PY (Pengyu) Song

TI__Mastermind 39755 points

Hi PY,

After testing in lab, the blink rate register (0x18) controls blink rate for both LEDs at the same time. As both LEDs have the option to blink for activity either via strapping (LED_0), or register modification (both LEDs), if both LEDs are set to blink, they will blink at the rate defined by register 0x18[10:9].

Sincerely,

Gerome

0 PY (Pengyu) Song over 3 years ago in reply to Gerome Cacho

TI__Expert 5860 points

Hi Gerome,

Thank you for the update. In this case, can I confirm that below settings can be implemented without additional register set?

LED_0: configure for Link OK – 0000 in MLEDCR [6:3].
LED_1: configure for TX/RX activity with blinking, prefer 10Hz blink rate – 0001 in LEDCFG1 [11:8].

+1 Gerome Cacho over 3 years ago in reply to PY (Pengyu) Song

TI__Mastermind 39755 points

Hi PY,

LED_0 is default link via strapping, so a software write may not be needed. However, if it is strapped in mode 1 or 2 where blink is, then you must route MLED to LED_0 (0x25[1:0]) and ensure [6:3] = '0'.

LED_1 can also be configured as blink upon activity by writing 0x460[11:8] as '1000'. If you write '0001', then the light will turn on if there is activity, not blink.

Sincerely,

Gerome

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DP83822H: LED_1 Blink Rate