Fujitsu MB86617A manual Physical register #01 read/write

LSI Specification

MB86617A

8.3. Physical register #01 (read/write)

Physical Register#01 is the register that set s/indicates force-root and gap-count.

Do not write into this register except for the case that the node is

Bus manager or Isochronous resource manager in the environment with

no Bus manager.

phy/

Bit

Bit

Bit

Bit

Bit

Bit

Bit

Bit

Bit

Bit

Bit

Bit

Bit

Bit

Bit

Bit

link-

R/W

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

0

addr

02 h

R/W

-

-

-

-

-

-

-

-

RHB

IRB

Gap_count

Initial Value

‘0’

‘0’

‘0’

‘0’

‘0’

‘0’

‘0’

‘0’

‘0’’

‘0’

“3F h”

ョDescription of Each Bit

BIT	Bit Name	Action	Value	Function
		Read	-	Always indicate ‘0’.
15 - 8	reserved
		Write	-	Always write‘0’.
	RHB	Read/	0	This node does not try to be root during next bus reset.
7
	Note 1)	Write	1	This node tries to be root during next bus reset.
			0	Does not perform bus reset.
6	IRB	Read/
		Write
			1	Performs bus reset. Automatically clears to “0” at the completion of bus reset.
	Gap_count	Read	-	Indicate current gap-count value (MSB: 5 , LSB: 0).
5 - 0
	Note 2)
		Write	-	Set gap-count value (MSB: 5 , LSB: 0).

Note 1) This bit is automatically set by receiving the PHY configuration packet, too.

Note 2) This bit is automatically set by receiving the PHY configuration packet, too.

Also, this bit value returns to initial value at the second next bus reset.

Rev.1.0 84 Fujitsu VLSI