88e3015 Marvell Semiconductor, Inc., 88e3015 Datasheet - Page 28

• Manufacturer Part Number: 88e3015
• Description: Integrated 10/100 Fast Ethernet Transceiver
• Manufacturer: Marvell Semiconductor, Inc.

2.2.2 Preamble Suppression
The 88E3015/88E3018 devices are permanently programmed for preamble suppression. A minimum of one idle
bit is required between operations.
2.2.3 Programming Interrupts
When Register 22:11:8 is set to 1110, the interrupt functionality is mapped to the LED[2] pin.The interrupt function
drives the LED[2] pin active whenever an interrupt event is enabled by programming register 18. The polarity of
the interrupt signal is determined by Register 25.14. This function minimizes the need for polling via the serial
management interface. Table 14 shows the interrupts that may be programmed.
Register 18 determines whether the LED[2] pin is asserted when an interrupt event occurs. Register 19 reports
interrupt status. When an interrupt event occurs, the corresponding bit in register 19 is set and remains set until
register 19 is read via the serial management interface. When interrupt enable bits are not set in register 18, inter-
rupt status bits in register 19 are still set when the corresponding interrupt events occur. However, the LED[2] pin
is not asserted.
The LED[2] pin is active as long as at least one interrupt status bit is set in register 19 with its corresponding inter-
rupt enable bit set in register 18, and Register 22:11:8 = 1110.
To de-assert the LED[2] pin:
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Doc. No. MV-S103657-00, Rev. C
Page 28
Clear of register 19 via a serial management read
Disable the interrupt enable by writing register 18
Table 14:
Re gister
A d d r ess
18.14
18.13
18.12
18.11
18.10
18.9
18.8
18.7
18.6
18.4
18.1
18.0
88E3015/88E3018
Integrated 10/100 Fast Ethernet Transceiver
Programmable Interrupts
Document Classification: Proprietary Information
Progra mmable Inte rrupts
Speed Changed Interrupt Enable
Duplex Changed Interrupt Enable
Page Received Interrupt Enable
Auto-Negotiation Completed Interrupt Enable
Link Status Changed Interrupt Enable
Symbol Error Interrupt Enable
False Carrier Interrupt Enable
FIFO Over/Underflow Interrupt Enable
MDI/MDIX Crossover Changed Enable
Energy Detect Changed Enable
Polarity Changed Enable
Jabber Interrupt Enable
CONFIDENTIAL
October 26, 2006, Advance
Copyright © 2006 Marvell