Sundance Spas ST201 manual CLK25, Miscellaneous, Power and Ground

Sundance Technology

ST201 PRELIMINARY draft 2

PIN NAME LEDPWRN

LEDLNKN

LEDDPLXN

LEDSPDN

GPIO0

GPIO1

RSTOUT

X25I

X25O

CLK25

VCC (5V) GND (5V) VCC (3.3V) GND (3.3V)

PIN TYPE OUTPUT

OUTPUT

OUTPUT

OUTPUT

IN/OUT

IN/OUT OUTPUT

OSCIN

OSCOUT

OUTPUT

POWER GROUND POWER GROUND

PIN DESCRIPTION

Power Status LED. (This pin is shared with EA9). The operation of this pin varies based on the setting in the I/O Registers, AsicCtrl bit 14 (the LEDMode bit). In Mode 0, LOW when power is applied, and toggling when frame transmission is in progress. In Mode 1, this pin is always LOW when power is applied.

Link Status LED. (This pin is shared with EA10). The operation of this pin varies based on the setting in the I/O Registers, AsicCtrl bit 14 (the LEDMode bit). In Mode 0, LOW when a valid link exists, toggling when frame reception is in progress. In Mode 1, LOW when a valid link exists, and toggling when either frame transmission or reception is in progress.

Duplex Status LED. (This pin is shared with EA11). This pin operates independently of the I/O Registers, AsicCtrl bit 14 (the LEDMode bit). This pin is LOW when the PHY is in full duplex mode, and toggles when collisions are detected.

Speed Status LED. (This pin is shared with EA12). This pin operates independently of the I/O Registers, AsicCtrl bit 14 (the LEDMode bit). This pin is LOW when the link speed is 100Mbps, and HIGH when the link speed is 10Mbps.

MISCELLANEOUS

General Purpose Input/Output. (This pin is shared with ED6)

General Purpose Input/Output. (This pin is shared with ED7)

Reset Output, assertion level is programmable (see I/O Registers, AsicCtrl bit 15). The ST201 will assert RSTOUT when it is being reset. RSTOUT is intended to be used to reset other circuitry on the adapter.

25MHz Crystal Oscillator Input. The external 25MHz crystal and capac- itor is connected to the on-chip crystal oscillator circuit through X25I input. Alternately, X25I can be driven by an external clock source.

25MHz Crystal Oscillator Output. The external crystal and capacitor is also connected to the output of the on-chip crystal oscillator circuit through X25O. When X25I is driven by an external clock source, X25O should be left unconnected.

25MHz Clock Output. CLK25 carries the reference clock generated by the on-chip crystal oscillator. This is a free-running and continuous clock signal.

POWER AND GROUND

+5 volts power supply.

+5 volts power return.

+3.3 volts power supply.

+3.3 volts power return.

TABLE 2: ST201 Pin Descriptions

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