s1r72900 Epson Electronics America, Inc., s1r72900 Datasheet - Page 18

• Manufacturer Part Number: s1r72900
• Description: Physical Layer Ic Compliant With The Ieee 1394-1995 And Ieee 1394a-2000 Standards.
• Manufacturer: Epson Electronics America, Inc.

S1R72900F00A
7.1.3 Page_select 0 bits
7.1.3.1 Register 00
Bits 0 to 1: Status of TPA
Bits 2 to 3: Status of TPB
Bit 4: Child
Bit 5: Connected
Bit 6: Cable Bias
Bit 7: Port Disabled
14
These bits indicate the status of TPA. The meaning of these bits is as follows:
These bits indicate the status of TPB. The meaning of these bits is as follows:
When this bit is '1,' the port is a Child. When this bit is '0,' the port is a Parent.
This bit is initialized by bus reset, and determined during a Tree-ID period.
When this bit is '1,' it indicates that the port recognizes a node is connected.
This bit reflects the cable bias detected at the port. When this bit is '1,' it indicates that TpBias is detected at the port.
When this bit is set to '1,' the port is disabled.
This bit is initialized as hardware reset occurs.
Register00
Register01
Register02
Register03
Register04
Register05
Register06
Register07
Address
0x08
Name
'11b':Z
'01b':1
'10b':0
'00b':invalid
'11b':Z
'01b':1
'10b':0
'00b':invalid
0: Astat [0]
1: Astat [1]
2: Bstat [0]
3: Bstat [1]
4: Child
5: Connected
6: Bias
7: Disabled
Address
Bit Symbol
1000
1001
1010
1011
1100
1101
1110
1111
0
Table 7.2 Registers of Page_Select 0
Negotiated_speed
AStat
R/W
R/W
R
R
R
R
R
R
R
1
Power Reset Value
EPSON
See description
2
BStat
Int_enable
0
0
0
0
0
0
0
3
Child
Fault
Port Disabled
Status of TPA
Status of TPA
Status of TPB
Status of TPB
Child
Connected
Cable Bias
4
Connected
Description
5
Bias
6
Disabled
Rev. 1.0
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