Altera Triple Speed Ethernet MegaCore Function - Manual (Page 86)

Base Configuration Registers (Dword Offset 0x00 – 0x17)
Table 6-2 lists the base registers you can use to configure the MAC function. A software reset does not reset
these registers except the first two bits (
TX_ENA
and
RX_ENA
= 0) in the
command_config
register.
Table 6-2: Base Configuration Register Map
HW Reset Description R/W Name Dword
Offset
version
number> • Bits[15:0]—Set to the current version of the MegaCore
function.
• Bits[31:16]—Customer specific revision, specified by
the
CUST_VERSION
parameter defined in the top-level
file generated for the instance of the MegaCore
function. These bits are set to 0 during the configura-
tion of the MegaCore function.
RO
rev
0x00
0 Scratch register. Provides a memory location for you to
test the device memory operation. RW
scratch
(1) 0x01
0 MAC configuration register. Use this register to control
and configure the MAC function. The MAC function
starts operation as soon as the transmit and receive enable
bits in this register are turned on. Altera, therefore,
recommends that you configure this register last.
See Command_Config Register (Dword Offset 0x02)
on page 6-7 for the bit description.
RW
command_config
0x02
0 6-byte MAC primary address. The first four most
significant bytes of the MAC address occupy
mac_0 in
reverse order. The last two bytes of the MAC address
occupy the two least significant bytes of
mac_1 in reverse
order.
For example, if the MAC address is 00-1C-23-17-4A-CB,
the following assignments are made:
mac_0 = 0x17231c00
mac_1
= 0x0000CB4a
Ensure that you configure these registers with a valid
MAC address if you disable the promiscuous mode
(
PROMIS_EN
bit in
command_config
= 0).
RW
mac_0
0x03
0 RW
mac_1
0x04
1518 • Bits[15:0]—16-bit maximum frame length in bytes.
The MegaCore function checks the length of receive
frames against this value. Typical value is 1518.
In 10/100 and 1000 Small MAC core variations, this
register is RO and the maximum frame length is fixed
to 1518.
• Bits[31:16]—unused.
RW/
RO
frm_length
0x05
Altera Corporation Configuration Register Space
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6-3 Base Configuration Registers (Dword Offset 0x00 – 0x17)
UG-01008
2014.06.30