dp83251 National Semiconductor Corporation, dp83251 Datasheet - Page 71

• Manufacturer Part Number: dp83251
• Description: Player Device Fddi Physical Layer Controller
• Manufacturer: National Semiconductor Corporation

6 0 Pin Descriptions
PHY PORT INTERFACE
The PHY Port Interface consists of I O signals used to connect the PLAYER Device to the Media Access Control (MAC)
sublayer or other PLAYER Devices The DP83255 Device has two PHY Port Interfaces The A Request and A Indicate paths
form one PHY Port Interface and the B Request and B Indicate paths form the second PHY Port Interface Each path
consists of an odd parity bit a control bit and two 4-bit symbols
Refer to Section 3 3 the Configuration Switch for more information
Symbol
AIP
AIC
AID7
AID6
AID5
AID4
AID3
AID2
AID1
AID0
ARP
ARC
ARD7
ARD6
ARD5
ARD4
ARD3
ARD2
ARD1
ARD0
Pin No
24
26
28
30
33
36
39
41
43
45
25
27
29
31
34
37
40
42
44
46
I O
O
O
O
O
I
I
I
I
(Continued)
PHY Port A Indicate Parity A TTL output signal representing odd parity for the 10-bit
wide Port A Indicate signals (AIP AIC and AID
PHY Port A Indicate Control A TTL output signal indicating that the two 4-bit symbols
(AID
e
PHY Port A Indicate Data TTL output signals representing the first 4-bit data control
symbol
AID7 is the most significant bit and AID4 is the least significant bit of the first symbol
PHY Port A Indicate Data TTL output signals representing the second 4-bit data
control symbol
AID3 is the most significant bit and AID0 is the least significant bit of the second symbol
PHY Port A Request Parity A TTL input signal representing odd parity for the 10-bit
wide Port A Request signals (ARP ARC and ARD
PHY Port A Request Control A TTL input signal indicating that the two 4-bit symbols
(ARD
(ARC
PHY Port A Request Data TTL input signals representing the first 4 bit data control
symbol
ARD7 is the most significant bit and ARD4 is the least significant bit of the first symbol
PHY Port A Request Data TTL input signals representing the second 4-bit data control
symbol
ARD3 is the most significant bit and ARD0 is the least significant bit of the second
symbol
0)
k
k
e
7 4
7 4
0)
l
l
and AID
and ARD
k
3 0
k
71
3 0
l
) are either control symbols (AIC
l
) are either control symbols (ARC
Description
k
7 0
k
l
7 0
)
l
)
e
1) or data symbols (AIC
e
1) or data symbols