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24 Am79C930
PRELIMINARY
ISA PLUG AND PLAY PIN SUMMARY (continued)
Output Driver Types
Input Types
No. of
Pins Pin Name Pin Function Pin Style
1 TXC Transmit Clock—may be configured either as input or output TS1
1 LFPE
Low Frequency Power Enable—used to power up the low-frequency section of
the transceiver
PTS1
1 LFCLK Low Frequency Clock—a reference signal for the transceiver synthesizer TS1
1 HFPE
High Frequency Power Enable—used to power up the high-frequency section
of the transceiver
PTS1
1 HFCLK High Frequency Clock—a reference signal for the transceiver synthesizer TS1
1 ANTSLT Antenna Select—used to select between two antennas PTS1
1 TXCMD
Transmit Command—used to select the transmit path in the transceiver TP1
1 TXPE
Transmit Power Enable—used to power up the transmit section of the
transceiver
TP1
1 TXDATA Transmit Data—supplies the transmit data stream to the transceiver TP1
1 TXMOD
Transmit Modulation Enable—enables the modulation of transmit data TP1
1 RXPE
Receive Power Enable—enables the receive function of the transceiver PTS1
1 RXDATA Receive Data—accepts receive data in NRZ format from the transceiver I
1 FDET
Frame Detect—start of frame delimiter detection indication TS1
1 RXCIN Receive Clock Input—optional clock input that allows for an external PLL IPU
1 SDCLK Serial Data Clock—clock output used to access serial peripheral devices PTS1
1 SDDATA Serial Data Data—data pin used to access serial peripheral devices PTS1
3 SDSEL3
–SDSEL1 Serial Data Select—chip select outputs used to select serial peripheral devices PTS1
1 A
CT Activity LED—output capable of driving an LED PTS2
1 LNK
Link LED—output capable of driving an LED PTS2
1 ADREF
A/D Reference—an input that can be used to set the analog reference voltage
for the internal A/D converter
I
7 SAR6–SAR0
Serial Approximation Register—supplies the value of the serial approximation
register used in the A/D converter
TS1
2 ADIN1–2 Comparator—A/D comparator inputs TS1
12 V
CC
Power I
13 GND Ground I
Name Type I
OL
I
OH
load
TP1 Totem pole 4 mA –4 mA 50 pF
TS1 Tri-state 4 mA –4 mA 50 pF
TS2 Tri-state 24 mA –4 mA 120 pF
PTS1 User-programmable tri-state 4 mA –4 mA 50 pF
PTS2 User-programmable tri-state 12 mA –4 mA 50 pF
PTS3 User-programmable tri-state 24 mA –4 mA 120 pF
OD2 Open drain 24 mA –4 mA 120 pF
XO Xtal amplifier Output NA NA
Name Type Size of Pullup Size of Pulldown
I Input NA NA
IPU Input with internal pullup device >50K
Ω
NA
IPD Input with internal pulldown device NA >50K
Ω