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ESM-2850
28 ESM-2850 User’s Manual
2.4.2.1 Signal 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
GBE0_MD[0:3] +/-
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:
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.