1iynwsotqs4tr-hc8hsewn * Marvell Semiconductor Inc * UNDER NDA# 12104823
MARVELL CONFIDENTIAL - UNAUTHORIZED DISTRIBUTION OR USE STRICTLY PROHIBITED
Doc. No. MV-S108008-00 Rev. -- CONFIDENTIAL Copyright © 2012 Marvell
Page 16 Document Classification: Proprietary Information July 31, 2012, Draft
Not Approved by Document Control. For Review Only.
Link Street
®
88E6240 Datasheet
4 FE + 3 GE AVB Switch with Energy Efficient Ethernet (EEE)
38 EE_CLK
/C1_LED
/FLOW
Typically
Output, PD
Serial EEPROM clock and Column 1 for the LEDs. EE_CLK is the serial
EEPROM clock reference output by the devices. It is used to shift the
external serial EEPROM (if installed) to the next data bit so the default
values of the internal registers can be overridden.
EE_CLK is a multi-function pin which is also used to connect to the
anode of LED column 1 for each row, if used in the multiplexed LED
mode (see R[2:0]_LED above). This pin is not used when the LEDs are
in a non-multiplexed mode.
It is also used to configure the device after a hardware reset. After reset
is asserted, EE_CLK becomes an input and the configuration information
below is latched 1 mSec after the rising edge of RESETn as follows:
0 = Disable flow control on all ports
1 = Enable advertisement of full-duplex flow control on all PHYs and
enable “forced collision” flow control on all half duplex ports
Full-duplex flow control requires support from the end station. It is
supported on any full-duplex port that has Auto-Negotiation enabled,
advertises that it supports Pause (i.e., FLOW = 0x1 at reset), and sees
that the end station also supports Pause (from data returned during
Auto-Negotiation).
Half-duplex flow control is active on all half-duplex ports when enabled.
EE_CLK is internally pulled low via a resistor so the pin can be left
floating when unused. Use a 4.7 kohm resistor to EE_VDDO for a
configuration high.
36
EE_DIN
/C0_LED
/P3_LED0
/EEE_WP
Typically
Output, PD
Serial EEPROM data into the 4-wire EEPROM devices and Column 0 for
the LEDs. EE_DIN is serial EEPROM data referenced to EE_CLK used
to transmit the EEPROM command and address to the external 4-wire
serial EEPROM (if present). The pin is not used for 2-wire serial
EEPROMs.
EE_DIN is a multi-function pin which is also used to connect to the anode
of LED column 0 for each row, if used in the multiplexed LED mode (see
R[2:0]_LED above). This same pin can be used to directly drive an LED
in a non-multiplexed fashion (P3_LED0). In this mode the cathode of the
LED connects to this pin through a series current limiting resistor. The
anode of each LED connects to a power source.
It is also used to configure the device after a hardware reset. After reset
is asserted, EE_DIN becomes an input and the configuration information
below is latched 1 mSec after the rising edge of RESETn as follows:
0 = Enable Energy Efficient Ethernet (EEE) in the PHYs and the
EEPROM is write enabled
1 = Disable Energy Efficient Ethernet (EEE) in the PHYs and the
EEPROM is write protected
EE_DIN is internally pulled low via a resistor so the pin can be left floating
when unused. Use a 4.7 kohm resistor to EE_VDDO for a configuration
high.
1. The address is sent out the EE_IO pin only for 2-wire EEPROMs.
Table 6: Port Status LEDs (Ports 0 to 6) (Continued)
88E6240
Pin #
Pin Name Pin Type Description