ESM-2850

2.4.2.1Signal Description – ETX Express Connector 1 (CN1A) 2.4.2.1.1 Audio Signals

Signal

Signal Description

AC_SYNC

48kHz fixed-rate, sample-synchronization signal to the CODEC(s)

AC_RST#

Reset output to AC97 CODEC, active low.

 

 

AC_SDIN[0:2]

Serial TDM data inputs from up to 3 CODECs.

AC_BITCLK

12.228 MHz serial data clock generated by the external CODEC(s)

 

 

AC_SDOUT

Serial TDM data output to the CODEC.

 

 

2.4.2.1.2 Gigabit Ethernet Signals

 

Signal

 

 

 

 

 

 

Signal Description

 

 

 

 

 

Gigabit Ethernet Controller 0: Media Dependent Interface Differential Pairs 0,1,2,3.

 

 

 

The MDI can operate in 1000, 100 and 10 Mbit / sec modes. Some pairs are

 

 

 

unused in some modes, per the following:

 

 

 

 

 

 

 

GBE0_MD[0:3] +/-

 

 

 

 

 

 

1000B-T

 

 

100B-T

 

 

 

10B-T

 

 

 

 

 

MDI[0]+/-

 

B1_DA+/

 

TX+/-

 

 

TX+/-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MDI[1]+/

 

B1_DB+/

 

RX+/-

 

 

RX+/-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MDI[2]+/

 

 

B1_DC+/

 

 

X

 

 

 

X

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MDI[3]+/

 

B1_DD+/

 

X

 

 

X

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GBE0_ACT#

Gigabit Ethernet Controller 0 activity indicator, active low.

 

 

 

 

 

 

 

 

GBE0_Link#

Gigabit Ethernet Controller 0 link indicator, active low.

 

 

 

GBE0_Link100#

Gigabit Ethernet Controller 0 100 Mbit / sec link indicator, active low.

 

 

 

 

 

 

GBE0_Lin1000#

Gigabit Ethernet Controller 0 1000 Mbit / sec link indicator, active low.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2.4.2.1.3 GPIO Signals

Signal

Signal Description

GPI[0:3]

General purpose input pins. Pulled high internally on the module.

GPO[0:3]

General purpose output pins. Upon a hardware reset, these outputs will be low.

 

 

28 ESM-2850 User’s Manual