Block descriptions

UM0805

12/29

Doc ID 16304 Rev 3

6.4.2

Ethernet LEDs

6.5

USB 2.0 subsystem

6.5.1

Host ports

The board has two host ports that are fully compliant with the USB 2.0 specification (two

controllers with one port each). This means that the two hosts can work in concurrent mode

with the maximum possible bandwidth. Each host has also full control of the VBUS supplied

by the TPS2030 power switch that also provides overcurrent protection in case of a short

circuit in the USB cable. The ports are equipped with LEDs showing the power status of

each port. (The green LED indicates the presence of VBUS and the red one the current

limiter status).

6.5.2

Device port

A USB 2.0 device port is also provided.

6.6

Debug interface

Two debug interfaces are provided:

1.

The JTAG interface can be used for "static" debug. This means that is possible to set a

breakpoint and, when the system stops, to verify the contents of the memory and/or

registers and modify them if needed.

2.

The ETM9 interface can be used for "dynamic" debug. The ETM9 block embedded in

the SPEAr600 chip, sends all the information about the AHB transactions during code

Table 5.

Ethernet LEDs

Reference

Description

D7

Duplex Status: The LED is lit when the PHY is in Full Duplex operation after the

link is established.

D8

1000M Speed and Good Link LED: The LED output indicates that the PHY has

established a good link at 1000 Mbps.

In 1000BASE-T mode, the link is established as a result of training, Auto-

Negotiation completed, valid 1000BASE-T link established and reliable reception

of signals transmitted from a remote PHY is received.

D9

100M Speed and Good Link LED: The LED output indicates that the PHY has

established a good link at 100 Mbps.

In 100BASE-T mode, the link is established as results of an input receive

amplitude compliant with TP-PMD specifications which will result in internal

generation of Signal Detect. LINK100_LED will assert after the internal Signal

Detect has remained asserted for a minimum of 500 µs. LINK100_LED will de-

assert immediately following the de-assertion of the internal Signal Detect.

D10

10M Good Link LED: In the standard 5-LED display mode, this LED output

indicates that the PHY has established a good link at 10 Mbps.

D11

Activity LED: The LED output indicates the occurrence of either idle error or

packet transfer.