AN2692 Freescale Semiconductor / Motorola, AN2692 Datasheet - Page 19

• Manufacturer Part Number: AN2692
• Description: MC9S12NE64 Integrated Ethernet Controller
• Manufacturer: Freescale Semiconductor / Motorola

The MACAD registers are shown in
MAC Address Recognition and Filtering
MAC address recognition and filtering can be controlled using PROM, CONMC, and BCREF bits in the
receive control and status (RXCTS) register.
Address filtering is very powerful because it is managed in the EMAC state machine, thus it does not
require CPU bandwidth. In fact, while using this feature, unwanted Ethernet packets are blocked and do
not cause a flag or interrupt. With the MC9S12NE64, four filtering modes are available: unicast,
broadcast, multicast, and promiscuous filtering modes. Unicast, broadcast, and multicast modes can work
together, but the promiscuous filtering mode overrides all MAC hardware address recognition and
filtering.
Freescale Semiconductor
Reset:
Reset:
Reset:
Read:
Read:
Read:
Write:
Write:
Write:
15
15
15
0
0
0
14
14
14
0
0
0
Figure 12. Receive Control and Status (RXCTS) Register
13
13
13
0
0
0
Reset:
Read:
Write:
MC9S12NE64 Integrated Ethernet Controller, Rev. 0.2
12
12
12
0
0
0
RXACT
11
11
11
0
0
0
Bit 7
Figure
Figure 11. MACAD Registers
0
10
10
10
0
0
0
= Unimplemented
11.
Figure 12
6
0
0
9
0
9
0
9
0
MACAD[47:32]
MACAD[31:16]
MACAD[15:0]
8
0
8
0
8
0
5
0
0
MC9S12NE64 Ethernet Media Access Controller (EMAC)
shows the RXCTS register.
7
0
7
0
7
0
RFCE
4
0
6
0
6
0
6
0
5
0
5
0
5
0
3
0
0
4
0
4
0
4
0
PROM
2
0
3
0
3
0
3
0
CONMC
2
0
2
0
2
0
1
0
1
0
1
0
1
0
BCREJ
Bit 0
0
0
0
0
0
0
0
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