VSC8601 Datasheet
Configuration
4.3
Extended Page Registers
To provide functionality beyond the IEEE802.3-specified 32 registers and main device
registers, the VSC8601 device includes an extended set of registers that provide an
additional 15 register spaces.
To access the extended page registers (16E through 30E), enable extended register
access by writing 0x0001 to register 31. For more information, see Table 35, page 56.
When extended page register access is enabled, reads and writes to registers 16
through 30 affect the extended registers 16E through 30E instead of those same
registers in the IEEE-specified register space. Registers 0 through 15 are not affected
by the state of the extended page register access.
Writing 0x0000 to register 31 restores the normal register access.
The following table lists the addresses and register names in the extended register
page space. These registers are accessible only when the device register 31 is set to
0x0001.
Table 34.
Extended Registers Page Space
Register Address Register Name
16E
17E
18E
19E
20E
21E
22E
23E
24E
25E
26E
27E
28E
29E
30E
Enhanced LED method select
Enhanced LED behavior
CRC good counter
MAC resistor calibration control
Extended PHY control 3
EEPROM interface status and control
EEPROM data read or write
Extended PHY control 4
Reserved
Reserved
Reserved
Extended PHY control 5
RGMII skew control
Ethernet packet generator (EPG) 1
Ethernet packet generator (EPG) 2
Revision 4.1
September 2009
Page 55
VITESSE [ VITESSE SEMICONDUCTOR CORPORATION ]
