dp83251 National Semiconductor Corporation, dp83251 Datasheet - Page 60

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dp83251

Manufacturer Part Number
dp83251
Description
Player Device Fddi Physical Layer Controller
Manufacturer
National Semiconductor Corporation
Datasheet
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 DP83251 Device has one PHY Port Interface which consists of the B Request and the
A Indicate paths
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 further information
Symbol
AIP
AIC
AID7
AID6
AID5
AID4
AID3
AID2
AID1
AID0
BRP
BRC
BRD7
BRD6
BRD5
BRD4
BRD3
BRD2
BRD1
BRD0
Pin No
16
17
18
19
21
23
25
26
27
28
70
69
68
67
65
63
61
60
59
58
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
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 B Request Parity A TTL input signal representing odd parity for the 10-bit
wide Port A Request signals (BRP BRC and BRD
PHY Port B Request Control A TTL input signal indicating that the two 4-bit symbols
(BRD
(BRC
PHY Port B Request Data TTL input signals representing the first 4 bit data control
symbol
BRD7 is the most significant bit and BRD4 is the least significant bit of the first symbol
PHY Port B Request Data TTL input signals representing the second 4-bit data control
symbol
BRD3 is the most significant bit and BRD0 is the least significant bit of the second
symbol
e
0)
k
k
e
7 4
7 4
0)
l
l
and AID
) and BRD
k
3 0
k
60
3 0
l
) are either control symbols (AIC
l
) are either control symbols (BRC
Description
k
7 0
k
l
7 0
)
l
)
e
1) or data symbols (AIC
e
1) or data symbols

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