LAN8804D datasheet(52/89 Pages) MICROCHIP

52 / 89 page

LAN8804D

DS00003591K-page 52

5.18

Coma Mode

Coma mode is designed to hold the PHY in a suspended state until system initialization is complete. When enabled by

driving the COMA_MODE pin high, all the errors, alarms, link up/down notifications, etc. are suppressed until COMA_-

MODE is driven low. This is useful in designs with multiple PHYs, as it allows all errors to be suppressed until the entire

board is configured. Coma mode operates as per Table 5-11.

Enhanced Mode 8

(Duplex/Collision)

Inactive

Half-Duplex link or no link

Active

Full-Duplex link

Blinking

Half-Duplex link, collisions detected

Enhanced Mode 9

(Collision)

Inactive

No collisions detected

Active

N/A

Blinking

Collisions detected

Enhanced Mode 10

(Activity)

Inactive

No activity

Active

N/A

Blinking

Activity

Enhanced Mode 11

N/A

Reserved

Enhanced Mode 12

(Parallel Detect Fault)

Inactive

No parallel detect fault

Active

Parallel detect fault

Blinking

N/A

Enhanced Mode 13

N/A

Reserved

Enhanced Mode 14

(Force LED Off)

Inactive

LED off

Active

N/A

Blinking

N/A

Enhanced Mode 15

(Force LED On)

Inactive

N/A

Active

LED on

Blinking

N/A

TABLE 5-11:

COMA MODE OPERATION

Chip Function

Coma Mode Active

Gigabit PHY Hard Macros

Gigabit PHYs held in disabled state (except configuration registers).

No data is sent to the line or MAC, no recovered clock, no interrupt/error/

etc. indications given to the system.

LEDs

LEDs inactive

Interrupt

Interrupts inactive

TABLE 5-10:

EXTENDED MODE OPERATION (CONTINUED)

Mode

PORTxLEDy

Definition

LAN8804D Datasheet(PDF) 52 Page - Microchip Technology

LAN8804D Datasheet(HTML) 52 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89

Datasheet Download

Link URL