Altera Triple Speed Ethernet MegaCore Function Bedienungsanleitung PDF herunterladen (Seite 165)

Figure 8-1: Clock Distribution in MAC and SGMII PCS with GXB Configuration—Optimal Case

Figure shows the optimal clock distribution scheme you can achieve in configurations that contain the

10/100/1000 Ethernet MAC, SGMII PCS, and GX transceivers.

tbi _ tx _ clk 1

tbi _ rx _ clk 1

tbi _ rx _clk 2

tbi _ rx _ clk 3

tbi _ rx _clk 4

Port 4

clk 1

clk 2

clk 3

clk 4

PCS 1

rx _ clk 1

tx _ clk 1

PCS 2

rx _ clk 2

tx _ clk 2

PCS 3

rx _ clk 3

tx _ clk 3

PCS 4

rx _ clk 4

tx _ clk 4

4-port MAC

Port 2

Port 3

ref _clk

rx _ clk 1

tx _ clk 1

rx _ clk 2

tx _ clk 2

rx _clk 3

tx _ clk 3

rx _ clk 4

tx _ clk 4

ALTGX

(GIGE Mode )

ALTGX

(GIGE Mode )

ALTGX

(GIGE Mode )

Quad

Transceivers

ALTGX

(GIGE Mode )

ca l_blk_clk

ref _ clk

To sub s e que n t Q u ads, if a n y

tbi _ tx _ clk 2

tbi _ tx _ clk 3

tbi _ tx _ clk 4

Port 1

tx _ clk _en 1

rx _ clk _en 1

tx _ clk _en 2

rx _ clk _en 2

tx _ clk _en 3

rx _ clk _en 3

tx _ clk _en 1

rx _ clk _en 1

Note to Figure 8-1 :

1. The PMA layer in devices with GX transceivers uses ALTGX megafunctions.

In addition to the aforementioned optimization options, the TBI transmit and receive clocks can be used to

drive the MAC transmit and receive clocks, respectively.

Altera Corporation

Design Considerations

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8-3

MAC and PCS With GX Transceivers

UG-01008

2014.06.30

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