GR712RC-UM, Jun 2017, Version 2.9 134 www.cobham.com/gaisler
GR712RC
Table 114. GRETH MAC address MSB.
31 16 15 0
RESERVED Bit 47 downto 32 of the MAC address
31: 16 RESERVED
15: 0 The two most significant bytes of the MAC Address. Not Reset.
Table 115. GRETH MAC address LSB.
31 0
Bit 31 downto 0 of the MAC address
31: 0 The four least significant bytes of the MAC Address. Not Reset.
Table 116. GRETH MDIO ctrl/status register.
31 16 15 11 10 6 5 4 3 2 1 0
DATA PHYADDR REGADDR NV BU LF RD WR
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: “00001”.
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”.
5 RESERVED
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. Reset value: ‘0’.
3 Busy (BU) - When an operation is performed this bit is set to one. As soon as the operation is finished
and the management link is idle this bit is cleared. Reset value: ‘0’.
2 Linkfail (LF) - When an operation completes (BUSY = 0) this bit is set if a functional management
link was not detected. Reset value: ‘1’.
1 Read (RD) - Start a read operation on the management interface. Data is stored in the data field. Reset
value: ‘0’.
0 Write (WR) - Start a write operation on the management interface. Data is taken from the Data field.
Reset value: ‘0’.
Table 117. GRETH transmitter descriptor table base address register.
31 10 9 3 2 0
BASEADDR DESCPNT RES
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
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