LS1022A datasheet(42/71 Pages) FREESCALE

42 / 71 page

Architecture

TWR-LS1021A Reference Manual, Rev. 0

Freescale Semiconductor

2-27

NOTE

GPIO I/O signals are actively driven to high or low levels; software can

emulate open-drain drivers by driving 0 normally, but driving 1 by

switching to input mode and letting the external pullup operate.

2.22

Monitoring LEDs

The TWR-LS1021A has some LEDs which can be used to monitor various functions of the system:

2.23

MBED

This section will describe MBED circuit on TWR-LS1021A board. MBED is an open-standard serial and

debug adapter. It bridges serial and debug communications between a USB host and an embedded target

processor as shown in Figure 2-21.

SDHC_CMD, etc

GPIO_2[04:27]

Required for non-GPIO function

EMI_MDC, etc

GPIO_3[00:31]

Required for non-GPIO function

EC3_TX_EN, etc

GPIO_4[00:28]

Required for non-GPIO function

Table 2-19. LED status monitors

LED

LED Legend

Description

COLOR

POWER

3.3V is powered up

GREEN

SDA

MBED firmware is loaded.

GREEN

ASLEEP

ASLEEP is being asserted.

GREEN

RJ45(U20) right

Link

RGMII Link

GREEN

RJ45(U20) left

Activity

RGMII Activity

YELLOW

RJ45(P1) left down

Link

SGMII1 Link

GREEN

RJ45(P1) right down

Activity

SGMII1 Activity

YELLOW

RJ45(P1) left up

Link

SGMII2 Link

GREEN

RJ45(P1) right up

Activity

SGMII2 Activity

YELLOW

Table 2-18. GPIO mapping (continued)

DUT Primary

Function

DUT GPIO

Function

Notes

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