P Hysical Register #01 ( Read / Write ) - Fujitsu MB86617A Specification Sheet

LSI S pecification
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
link- R/W
15 14
addr
02 h R/W - -
Initial Value '0' '0'
Description of Each Bit
BIT Bit Name
15 - 8 reserved
RHB
7
Note 1)
6 IRB
Gap_count
5 - 0
Note 2)
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
Bit Bit Bit Bit
13 12 11 10
- - - -
'0' '0' '0' '0'
Action Value
Read - Always indicate '0'.
Write - Always write '0'.
0 This node does not try to be root during next bus reset.
Read/
Write
1 This node tries to be root during next bus reset.
0 Does not perform bus reset.
Read/
Write
1 Performs bus reset. Automatically clears to "0" at the completion of bus reset.
Read - Indicate current gap-count value (MSB: 5 , LSB: 0).
Write - Set gap-count value (MSB: 5 , LSB: 0).
Bit Bit Bit Bit
9 8 7 6
- - RHB IRB
'0' '0' '0'' '0'
Function
84
MB86617A
Bit Bit Bit Bit
5 4 3 2
Gap_count
"3F h"
Fujitsu VLSI
Bit Bit
1 0