CS4103 Datasheet, PDF (16/24 Pages) National Semiconductor (TI) – IEEE P1394a Physical Layer Device

Register Descriptions (Continued)
3.3 PORT STATUS: PAGE 0, PORTS[0:2]
The Port Status page is accessed by setting the
Page_select field to 000b in the Base register at Address
07h. Status information is selected per-port within the Port
Status page by setting the Port_select field in the Base reg-
ister at Address 07h. Three sets of port status registers,
one per-port, are indexed by the Port_select field. Valid
Port_select values are 000b, 001b, and 010b.
Address
08h
09h
0Ah-0Fh
Table 3-6. Port Status: Page 0 Bit Map
0
1
AStat
Negotiated_speed
2
3
4
BStat
Child
Int_Enable
Fault
RSVD
5
Connected
6
Bias
RSVD
7
Disabled
Bit
Address 08h
0:1
Name
AStat
2:3
BStat
4
Child
5
Connected
6
Bias
7
Disabled
Address 09h
0:2
Negotiated_ speed
3
Int_Enable
4
Fault
5:7
RSVD
Address 0Bh-0Fh
0:7
RSVD
Table 3-7. Port Status: Page 0 Registers
Access Reset Description
Page 0, Port[n], Register-0
R
Undef TPA Status: TPA differential line state detected by the TPA arbitration com-
parators of the port specified by Port_select.
00 = Invalid
01 = 1
10 = 0
11 = Z
R
Undef TPB Status: TPB differential line state detected by the TPB arbitration com-
parators of the port specified by Port_select.
00 = Invalid
01 = 1
10 = 0
11 = Z
R
Undef Child: When set, the port specified by Port_select is a child. If clear, the port
is a parent.
R
0
Connected: When set, the port specified by Port_select is connected.
R
Undef Bias: When set, the port specified by Port_select detects TPBias from a
connected PHY.
RW
0
Disable: When set, the port specified by Port_select is disabled.
Page 0, Port[n], Register-1
R
Undef Negotiated Speed: The maximum negotiated speed between the port spec-
ified by Port_select and a connected port.
000 = 100 Mbits/sec
001 = 200 Mbits/sec
010 = 400 Mbits/sec
All other settings are reserved.
RW
0
Interrupt Enable: When set, the port specified by Port_select, port event
interrupts are enabled. A change in connected, bias, disabled, or fault states
will set the Port_event bit.
RW
0
Fault: A Suspend or Resume operation error of the port specified by
Port_select will set this bit. Writing a one to the bit will clear it to zero.
--
--
Reserved
Page 0, Port[n], Register-2 through Register-7
RW
00h Reserved: Do not set bits in these fields. Setting bits in these fields may
cause noncompliant or unspecified behavior.
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