Specifications

ESS Technology, Inc. SAM0025A-062397 7
ES1879 DATA SHEET
PIN DESCRIPTION
PRELIMINARY
SECS 71 I Serial EEPROM CS. This pin is an input during reset when IRPOM = 1. It is No-Connect
when IRPOM = 0.
IRPOM SECS ROM Type
0 1 93LC66, 512×8, 9 address bits.
1 x Internal mask ROM.
DOCKED 72 I Status input that is active-high when the ES1879 is docked to the ES978. This pin has an
internal pull-down to GNDD.
RESET 73 I ISA active-high reset.
XI 75 I 14.31818 MHz clock input, or external crystal.
XO 76 O Output to external 14.31818 MHz crystal.
PCSPKI 77 I PC speaker digital input. This pin has an internal pull-down.
GPI0 79 I General-purpose input 0.
DRQD
80
O/Hi Z ISA active-high DMA request.
GPI1 I General-purpose input 1.
GPO[1:0] 82:81 O General-purpose outputs.
GPO2
83
O General-purpose outputs when SECS = 0.
SECLK I External serial EEPROM clock pin for PnP when SECS = 1.
DRQC
84
O/Hi Z ISA active-high DMA request.
GPI2 I General-purpose input 2.
DACKBC
85
I ISA active-low DMA acknowledge.
GPI3 I General-purpose input 3.
DRQB 86 O/Hi Z ISA active-high DMA request.
DACKBB 87 I ISA active-low DMA acknowledge.
DRQA 88 O/Hi Z ISA active-high DMA request.
DACKBA 89 I ISA active-low DMA acknowledge.
DACKBD
90
I ISA active-low DMA acknowledge.
MUTE I Active-low mute input. This pin has an internal pull-up to VDDD.
GPI4 I Optionally used as general-purpose input 4.
SEDI
91
I Data input pin to external PnP serial EEPROM when SECS = 1.
VOLUP I Active-low volume-up input. This pin has an internal pull-up to VDDD.
GPI5 I Optionally used as general-purpose input 5.
SEDO
92
O Data output pin to external PnP serial EEPROM when SECS = 1.
VOLDN I Active-low volume-down input. This pin has an internal pull-up to VDDD.
GPI6 I Optionally used as general-purpose input 6.
IRQE
93
O/Hi Z ISA interrupt request. 16 mA driver.
GPO6 O General-purpose output 6.
IRQD
94
O/Hi Z ISA interrupt request. 16 mA driver.
GPO5 O General-purpose output 5.
IRQC
95
O/Hi Z ISA interrupt request. 16 mA driver.
GPO4 O General-purpose output 4.
IRQB
96
O/Hi Z ISA interrupt request. 16 mA driver.
GPO3 O General-purpose output 3.
IRQA 97 O/Hi Z ISA interrupt request. 16 mA driver.
IORB 98 I ISA active-low read strobe.
IOWB 99 O ISA active-low write strobe.
Name Number I/O Description