Filter
Top Products
Datasheet
59
Networking Silicon — GD82559ER
8.1.2 System Control Block Command Word
Commands for the 82559ER’s Command and Receive units are placed in this register by the CPU.
8.1.3 System Control Block General Pointer
The System Control Block (SCB) General Pointer is a 32-bit field that points to various data
structures depending on the command in the CU Command or RU Command field.
8.1.4 PORT
The PORT interface allows software to perform certain control functions on the 82559ER. This
field is 32 bits wide:
•
Address and Data (bits 32:4)
•
PORT Function Selection (bits 3:0)
The 82559ER supports four PORT commands: Software Reset, Self-test, Selective Reset, and
Dump.
8.1.5 Flash Control Register
The Flash Control Register is a 32-bit field that allows access to an external Flash device.
8.1.6 EEPROM Control Register
The EEPROM Control Register is a 32-bit field that enables a read from and a write to the external
EEPROM.
8.1.7 Management Data Interface Control Register
The Management Data Interface (MDI) Control register is a 32-bit field and is used to read and
write bits from the MDI.
Bits Name Description
31:26
Specific
Interrupt Mask
Specific Interrupt Mask.
Setting this bit to 1b causes the 82559ER to stop
generating an interrupt (in other words, de-assert the INTA# signal) on the
corresponding event.
25 SI
Software Generated Interrupt.
Setting this bit to 1b causes the 82559ER
to generate an interrupt. Writing a 0b to this bit has no effect.
24 M
Interrupt Mask.
If the Interrupt Mask bit is set to 1b, the 82559ER will not
assert its INTA# pin. The M bit has higher precedence that the Specific
Interrupt Mask bits and the SI bit.
23:20 CUC
Command Unit Command.
This field contains the CU command.
19 Reserved This bit is reserved and should be set to 0b.
18:16 RUC
Receive Unit Command.
This field contains the RU command.
Bits Description
31:30 These bits are reserved and should be set to 00b.