Altera Triple Speed Ethernet MegaCore Function - Manual (Page 89)

HW Reset Description R/W Name Dword
Offset
0 Variable-length almost-full threshold of the transmit
FIFO buffer. Use the depth of your FIFO buffer to
determine this threshold.
You must set this register to a value greater than or equal
to 3. A value of 3 indicates 0 ready latency; a value of 4
indicates 1 ready latency, and so forth. Because the
maximum ready latency on the Avalon-ST interface is 8,
you can only set this register to a maximum value of 11.
This threshold is typically set to 3.
In 10/100 and 1000 Small MAC core variations, this
register is RO and the register is set to a fixed value of 3.
RW/
RO
tx_almost_full
0x0E
0 • Bits[4:0]—5-bit PHY address. Set these registers to
the addresses of any connected PHY devices you want
to access. The
mdio_addr0 and mdio_addr1 registers
contain the addresses of the PHY whose registers are
mapped to MDIO Space 0 and MDIO Space 1
respectively.
• Bits[31:5]—unused. Set to read-only value of 0.
RW
mdio_addr0
0x0F
1 RW mdio_addr1 0x10
0xFFFF • Bit[15:0]—16-bit holdoff quanta. When you enable
the flow control, use this register to specify the gap
between consecutive XOFF requests.
• Bits[31:16]—unused.
RW holdoff_quant 0x11
0 — — Reserved 0x12
–
0x16
0 • Bits[4:0]—minimum IPG. Valid values are between
8 and 26 byte-times. If this register is set to an invalid
value, the MAC still maintains a typical minimum
IPG value of 12 bytes between packets, although a read
back to the register reflects the invalid value written.
In 10/100 and 1000 Small MAC core variations, this
register is RO and the register is set to a fixed value
of 12.
Bits[31:5]—unused. Set to read-only value 0.
RW
tx_ipg_length
0x17
Note to Table 6-2 :
1. Register is not available in 10/100 and 1000 Small MAC variations.
Configuration Register Space Altera Corporation
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Base Configuration Registers (Dword Offset 0x00 – 0x17) 6-6
2014.06.30