GR740-UM-DS, Nov 2017, Version 1.7 216 www.cobham.com/gaisler
GR740
Table 240. 0x10 - GRETH_GBIT MDIO control/status register.
31 16 15 11 10 6 5 4 3 2 1 0
DATA PHYADDR REGADDR NV BU LF RD WR
0x0000 * 0b00000 ? 0 1 0 0
rw rw rw ? r r rw rw
31: 16 Data (DATA) - Contains data read during a read operation and data that is transmitted is taken from
this field. Reset value: 0x0000.
15: 11 PHY address (PHYADDR) - This field contains the address of the PHY that should be accessed
during a write or read operation. Reset value:
GRETH GBIT 0: “00001”.
GRETH GBIT 1: “00010”
10: 6 Register address (REGADDR) - This field contains the address of the register that should be
accessed during a write or read operation. Reset value: “00000”.
5RESERVED
4 Not valid (NV) - When an operation is finished (BUSY = 0) this bit indicates whether valid data has
been received that is, the data field contains correct data.
3 Busy (BU) - When an operation is performed this bit is set to one. As soon as the operation is fin-
ished and the management link is idle this bit is cleared.
2 Linkfail (LF) - When an operation completes (BUSY = 0) this bit is set if a functional management
link was not detected.
1 Read (RD) - Start a read operation on the management interface. Data is stored in the data field.
0 Write (WR) - Start a write operation on the management interface. Data is taken from the Data field.
Table 241. 0x14 - GRETH_GBIT transmitter descriptor table base address register.
31 10 9 3 2 0
BASEADDR DESCPNT RES
NR 0b0000000
rw rw
31: 10 Transmitter descriptor table base address (BASEADDR) - Base address to the transmitter descriptor
table.Not Reset.
9: 3 Descriptor pointer (DESCPNT) - Pointer to individual descriptors. Automatically incremented by
the Ethernet MAC.
2: 0 RESERVED
Table 242. 0x18 - GRETH_GBIT receiver descriptor table base address register.
31 10 9 3 2 0
BASEADDR DESCPNT RES
NR 0b0000000
rw rw
31: 10 Receiver descriptor table base address (BASEADDR) - Base address to the receiver descriptor
table.Not Reset.
9: 3 Descriptor pointer (DESCPNT) - Pointer to individual descriptors. Automatically incremented by
the Ethernet MAC.
2: 0 RESERVED
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