TUSB5052 datasheet(16/84 Pages) TI

16 / 84 page

3–4

Table 3–2. Internal/External Microcontroller Signals Defintion

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

WR*

External data memory write strobe

LED–4

LED-4 output

RD*

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 LEDs Signal and Hub-Port States

PORT-POWERED

ENABLED OR

SUSPENDED

DEVICE CONNECTED

SUSP-

SIGNAL

LEDn OUTPUT

COLOR

Flash (see Note 9)

Red/Green

Yes

Red

Yes

Green

Yes

Flash (see Note 9)

Red/Green

3-State

Blank

NOTE 6: 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

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

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