AX88140A データシートの表示（PDF） - Unspecified
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AX88140A Datasheet PDF : 46 Pages
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AX88140A
PRELIMINARY
Tab - 26 REG11 General -Purpose Timer Register Description
4.2.12 General -Purpose Port Register (REG12)
Field
31:9
R/W/C
Description
-
Reserved.--Written as “0” for future compatibility concern.
8
R/W
GPC - General Purpose Control .
1 Indicate next write REG12<7:0> is use
When a hardware reset is initiated, all gep pins
for define General purpose port in/out
become input pins.
direction.
0 Indicate next write REG12<7:0> is use
for read/write general purpose port data.
7:0
R/W
MD - General Purpose Mode and Data
Tab - 27 REG12 General -Purpose Port Register Description
4.2.13 Filtering Index (REG13)
FIELD
31:6
5:0
R/W/C
-
R/W
DESCRIPTION
Reserved.--Written as “0” for future compatibility concern.
FI - Filtering Index
When writing data to filtering buffer, uses filtering index register REG13 to point the position (buffer
number) in filtering buffer. The valid value is between 0 and 3.
Tab - 28 REG13 Filtering Index Register Description
4.2.14 Filtering data (REG14)
FIELD
31:0
R/W/C
R/W
DESCRIPTION
FD - Filtering Data
By indexed by filtering index register REG13, write the filtering data register REG14 to put filtering
address/hash table into filtering buffer..
Tab - 29 REG14 Filtering Data Register Description
Filtering Buffer
The AX88140A stores one Ethernet address for local physical address and filters the packets
with multicast addresses by 64 bits array. For any incoming frame with a multicast destination
address, the AX88140A applies the standard Ethernet cyclic redundancy check function to the
destination address, then uses the most significant 6 bits of the result as a bit index into the table. If
the indexed bit is set, the frame is accepted. If the bit is reset, the frame is rejected.
Description of Filtering Buffer
BUFFER
NUMBER
DESCRIPTION
0
BYTE 0 - 3 OF LOCAL PHYSICAL ADDRESS
1
BYTE 4 - 5 OF LOCAL PHYSICAL ADDRESS IN THE LEAST SIGNIFICANT WORD
2
BIT 0 - 31 OF MULTICAST ADDRESS FILTERING TABLE
3
Bit 32 - 63 of multicast address filtering table
Tab - 30 Description of Filtering Buffer
Layout of Filtering Buffer
BUFFER
NUMBER
0
BYTE 3
BYTE 2
BYTE 1
BYTE 0
PHYSICAL
PHYSICAL ADDRESS PHYSICAL ADDRESS PHYSICAL ADDRESS
ADDRESS BYTE 3
BYTE 2
BYTE 1
BYTE 0
28
ASIX ELECTRONICS CORPORATION
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