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Intel
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IXP42X product line and IXC1100 control plane processors—Ethernet MAC A
Intel
®
IXP42X Product Line of Network Processors and IXC1100 Control Plane Processor
DM September 2006
434 Order Number: 252480-006US
15.2.14 MDIO Commands Registers
Four registers make up the 32-bit MDIO Command that services both MII interfaces:
• MDIO Command[31:24] — MDIO Command 4
• MDIO Command[23:16] — MDIO Command 3
• MDIO Command[15:8] — MDIO Command 2
• MDIO Command[7:0] — MDIO Command 1
The detailed bit descriptions follow the four commands’ bit maps.
15.2.15 MDIO Command 1
15.2.16 MDIO Command 2
Register slottime
Bits Name Description
31:8 (Reserved)
7:0 Slot Time
Slot time for back-off algorithm
Expressed in number of tx_clk cycles.
128 in MII mode.
Register Name: mdiocmd1
Hex Offset Address: 0xC8009080 Reset Hex Value: 0x00000000
Register
Description:
MDIO Command 1 (8 Bits of 32-Bit Register).
Access: Read/Write.
70
MDIO Command [7:0]
Register Name: mdiocmd2
Hex Offset Address: 0x C8009084 Reset Hex Value: 0x00000000
Register
Description:
MDIO Command Register
Access: Read/Write.
31 87 0
(Reserved) MDIO_COMMAND [15:8]