Motorola PowerQUICC II MPC8280 Series Reference Manual page 838

Programming the Ethernet Controller
Table 25-1. SCC Ethernet Parameter RAM Memory Map (continued)
1
Offset Name
0x7C TFBD_PTR
0x7E TLBD_PTR
0x80 TBUF1_DATA0
0x84 TBUF1_DATA1
0x88 TBUF1_RBA0
0x8C TBUF1_CRC
0x90 TBUF1_BCNT
0x92 TX_LEN
0x94 IADDR1
0x96 IADDR2
0x98 IADDR3
0x9A IADDR4
0x9C BOFF_CNT
0x9E TADDR_H
0x A0 TADDR_M
0x A2 TADDR_L
1
From SCC base address. See Section 20.3.1, "SCC Base Addresses."
25.8 Programming the Ethernet Controller
The core configures the SCC to operate as an Ethernet controller by setting GSMR[MODE]
to 0b1100. Receive and transmit errors are reported through RxBD and TxBD. Several
GSMR fields must be programmed to special values for Ethernet. Set DSR[SYN1] to 0x55
and DSR[SYN2] to 0xD5. The 6 bytes of preamble programmed in the GSMR, in
combination with the DSR programming, causes 8 bytes of preamble on transmit
(including the 1-byte start delimiter with the value 0xD5).
25.9 SCC Ethernet Commands
Transmit and receive commands are issued to the CP command register (CPCR).
Table 25-2 describes transmit commands.
25-10
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Width
Hword Tx first BD pointer.
Hword Tx last BD pointer.
Word Save area 0—next frame.
Word Save area 1—next frame.
Word
Word
Hword
Hword Tx frame length counter.
Hword Individual address filter 1–4. Used in the hash table function of the individual
addressing mode. Zeros can be written to these values after reset and before the
Ethernet channel is enabled to disable all individual hash address recognition
functions. The
SET GROUP ADDRESS
Hword Backoff counter.
Hword Allows addition and deletion of addresses from individual and group hash tables.
After placing an address in TADDR, issue a
TADDR_L (temp address low) is the least-significant half word and TADDR_H
(temp address high) is the most-significant half word.
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Description
command is used to enable the hash table.
SET GROUP ADDRESS
command.
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