TUSB5052PZ datasheet(16/82 Pages) TI

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3−4

Table 3−2. Internal/External Microcontroller Signal Definitions

EXTEN = 1; INTERNAL MICROCONTROLLER

EXTEN = 0; EXTERNAL MICROCONTROLLER

P1.[7:0]

Port-1: 8-bit GPIO

I/O

P0.[7:0]

8-Bit data/address bus

I/O

P3.0

GPIO/RxD

I/O

AD8

Address line A8

P3.1

GPIO/TxD

I/O

AD9

Address line A9

P3.3

GPIO/INT1

I/O

AD10

Address line A10

P3.4

GPIO/T0

I/O

P3.4

Address line A15

LED-1

LED-1 output

ALE

Address latch enable

LED-2

LED-2 output

XINTO

Interrupt output

LED-3

LED-3 output

External data memory write strobe

LED-4

LED-4 output

External data memory read strobe

3.1

Hub-Ports LED Status Definition

Four LED outputs are provided to indicate the corresponding USB port states (LED-1 corresponds to Port-1, etc.).

All the LED signals are CMOS with

±4-mA sink/drive capability. Table 3−3 describes the LED signal level with its

corresponding port states. The colors generated correspond to the circuit implementation shown in Figure 3−2.

Table 3−3. Relation Between LED Signals and Hub-Port States

PORT-POWERED

ENABLED

DEVICE CONNECTED

SUSP-

SIGNAL

LEDn OUTPUT

COLOR

PORT

SUSPEND

Flash (see Note 10)

Red/Green

Yes

Red

Yes

Green

Yes

Flash (see Note 10)

Red/Green

No change

Blank

Yes

3-State

Blank

Yes

3-State

Red and green

Yes

NOTE 10: LED output is 512 ms on and 512 ms off.

Green

Red

1.5 k

Ω

1.5 k

Ω

1.5 k

Ω

LEDn

SUSP

To All LEDs

3.3 V

Figure 3−2. Dual LED Connection to LED and SUSP Signals

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