UPD72871F1 datasheet(21/48 Pages) NEC

21 / 48 page

Preliminary Data Sheet S13925EJ2V0DS00

µµµµPD72870,72871

2.2 Port Status Page (Page 000)

Figure 2-2. Port Status Page

1000

AStat

BStat

Child

Connected

Bias

Disabled

1001

Negotiated_speed

Int_enable

Fault

Reserved

1010

Reserved

1011

Reserved

1100

Reserved

1101

Reserved

1110

Reserved

1111

Reserved

Table 2-2. Bit Field Description

Field

Size

R/W

Reset value

Description

AStat

A port status value.

00:---, 10: “0”

01: “1”, 11: “Z”

BStat

B port status value.

00:---, 10: “0”

01: “1”, 11: “Z”

Child

Child node status value.

1: Connected to child node

0 : Connected to parent node

Connected

Connection status value.

1: Connected

0: Disconnected

Bias

Bias voltage status value.

1: Bias voltage

0: No bias voltage

Disabled

R/W

See

Description

The reset value is set by the PORTDIS pin.

1: Disable

Negotiated_

Speed

Shows the maximum data transfer rate of the node connected to this port.

000: 100 Mbps

001: 200 Mbps

010: 400 Mbps

Int_enable

R/W

The Port_event is set to 1 by a change to 1 of the Connected, Bias, Disable,

and Fault bits.

Fault

R/W

Set to 1 if an error occurs during Suspend/Resume.

Writing 1 to this bit clears it to 0.

Writing 0 has no effect.

Reserved

000…

Reserved. Read as 0.

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