VSC8504-02 datasheet(120/131 Pages) MICROSEMI

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Pin Descriptions

VMDS-10507 VSC8504-02 Datasheet Revision 4.2

109

6.3.4

Power Supply

The following table lists the power supply pins and associated functional pins. All power supply pins must

be connected to their respective voltage input, even if certain functions are not used for a specific

LED0_[0:3]

LED1_[0:3]

LED2_[0:3]

LED3_[0:3]

G1, H1, J1, K1

G2, H2, J2, K2

G3, H3, J3, K3

G4, H4, J4, K4

LED direct-drive outputs. All LEDs pins are

active-low. A serial LED stream can also be

implemented. See LED Mode Select, page 59.

Note: LEDbit_port, where port = PHY port

number and bit = the particular LED

for the port.

NC_1

NC_2

NC_3

NC_4

A16

T16

No connect.

PHYADD2

PHYADD3

PHYADD4

G13

G14

F14

I, PD,

Device SMI address bits 4:2.

RCVRDCLK1

RCVRDCLK2

F16

G16

Clock output can be enabled or disabled and also

output a clock frequency of 125 MHz or 25 MHz

based on the selected active recovered media

programmed for this pin. This pin is not active

when NRESET is asserted. When disabled, the

pin is held low.

REF_FILT_A

ABIAS Reference filter connects to an external 1 µF

capacitor to analog ground.

REF_REXT_A

ABIAS Reference external connects to an external 2 k

(1%) resistor to analog ground.

REFCLK_N

REFCLK_P

ADIFF

125 MHz or 25 MHz reference clock input pair.

Must be capacitively coupled and LVDS

compatible.

REFCLK_SEL2

I, PU,

Selects the reference clock speed:

0: 25 MHz (VSS)

1: 125 MHz (2.5 V)

Use 125 MHz for typical applications.

RESERVED_[1:8]

C10, D13, L4,

P4, L1, M1, N1,

Leave these pins unconnected (floating).

RESERVED_[18:19] J15, J16

Leave these pins unconnected (floating).

RESERVED_[70:73] E16, N3, N4, L2 NC

Leave these pins unconnected (floating).

THERMDA

Thermal diode anode.

THERMDC_VSS

Thermal diode cathode connected to device

ground. Temperature sensor must be chosen

accordingly.

For more information, see Initialization, page 42. For a typical bring-up example, see Configuration, page 41.

Table 129 •

Miscellaneous Pins (continued)

Name

Type

Description

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