UPD72871F1 datasheet(20/48 Pages) NEC

20 / 48 page

Preliminary Data Sheet S13925EJ2V0DS00

µµµµPD72870,72871

Table 2-1. Bit Field Description (3/3)

Field

Size

R/W

Reset value

Description

Port_event

R/W

Set to 1 when the Int_Enable bit in the register map of each port is 1 and

there is a change in the ports connected, Bias, Disabled and Fault bits.

Set to 1 when the Resume_int bit is 1 and any one port does resume.

Writing 1 to this bit clears it to 0.

Writing 0 has no effect.

Enab_accel

R/W

Enables arbitration acceleration.

Ack-acceleration and Fly-by arbitration are enabled.

1: Enabled

0: Disabled

If this bit changes while the bus request is pending, the operation is not

guaranteed.

Enab_multi

R/W

Enable multi-speed packet concatenation.

Setting this bit to 1 follows multi-speed transmission.

When this bit is set to 0,the packet will be transmitted with the same speed

as the first packet.

Page_select

R/W

000

Select page address between 1000 to 1111.

000: Port Status Page

001: Vendor Definition Page

Others: Unused

Port Selection.

Selecting 000 (Port Status Page) with the page selection selects the port.

µPD72870

µPD72871

Port_select

R/W

0000

0000: Port 0

0001: Port 1

0010: Port 2

Others: Unused

0000: Port 0

Others: Unused

Reserved

000…

Reserved. Read as 0.

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