UPD72874 データシートの表示（PDF） - NEC => Renesas Technology

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UPD72874

IEEE1394 OHCI 1.1 COMPLIANT 3PORT PHY-LINK 1-CHIP HOST CONTROLLER

NEC => Renesas Technology 

µPD72874

2. PHY REGISTERS

2.1 Complete Structure for PHY Registers

0000

0001

0010

0011

0100

0101

0110

0111

1000

1001

1010

1011

1100

1101

1110

1111

Figure 2-1. Complete Structure of PHY Registers

0

1

RHB

IBR

Extended (7)

Max_speed

Link_active Contender

Watchdog

ISBR

Page_select

2

3

4

5

6

7

Physical_ID

R

PS

Gap_count

Reserved

Total_ports

Reserved

Delay

Jitter

Pwr_class

Loop

Pwr_fail

Timeout Port_event Enab_accel Enab_multi

Reserved

Reserved

Port_select

Register0 (page_select)

Register1 (page_select)

Register2 (page_select)

Register3 (page_select)

Register4 (page_select)

Register5 (page_select)

Register6 (page_select)

Register7 (page_select)

Field

Physical_ID

R

PS

RHB

IBR

Gap_count

Extended

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

Size R/W Reset value

Description

6

R

000000 Physical_ID value selected from Self_ID period.

1

R

0

If this bit is 1, the node is root.

1: Root

0: Not root

1

R

Cable power status.

1: Cable power on

0: Cable power off

1 R/W

0

Root Hold -off bit. If 1, becomes root at the bus reset.

1 R/W

0

Initiate bus reset.

Setting to 1 begins a long bus reset.

Long bus reset signal duration: 166 µsec.

Returns to 0 at the beginning of bus reset.

6 R/W

111111 Gap count value.

It is updated by the changes of transmitting and receiving the PHY

configuration packet Tx/Rx.

The value is maintained after first bus reset.

After the second bus reset it returns to reset value.

3

R

111

Shows the extended register map.

Preliminary Data Sheet S15306EJ2V0DS

13

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