Lenovo PC 300GL Technical Information Manual 6272, 6282 - Page 23

Network Connection, General Purpose I/O Ports, Real-Time Clock and CMOS

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Chapter 2. System Board Features Network Connection Some models have a Crystal CS8920 Ethernet 10BASE-T controller and an RJ-45 connector integrated on the system board that provides a high-performance LAN connection. This integrated Ethernet is an ISA Plug and Play device with built-in support for Wake on LAN. Some models are equipped with an Ethernet or token-ring adapter. Features of the Ethernet adapter are: Operation in shared 10BASE-T or 100BASE-TX environment Transmits and receives data at 10 Mbps or 100 Mbps RJ-45 connector for LAN attachment Operates in symmetrical multiprocessing (SMP) environments Wake on LAN support Remote Program Load (RPL) support Note: The following information is for PC 300GL 6272 Without Diskette Drive computers: For operation of the computer within FCC Class A limits, you must use category 5 network cabling at 10 Mbps or 100 Mbps. Features of the token-ring adapter are: Transmits and receives data at 4 Mbps or 16 Mbps RJ-45 and D-shell connectors for LAN attachment Wake on LAN support Remote Program Load (RPL) support General Purpose I/O Ports The system board has up to 16 general purpose input/output (GPIO) pins which are implemented by two 8-bit GPIO ports. The use of GPIO pins is dependent upon system design. Features of the GPIO ports are: Open-drain outputs with internal pull-ups and transistor-transistor logic (TTL) inputs Base address is software configurable Direction is programmable Occupies 4-byte I/O address Real-Time Clock and CMOS The real-time clock is a low-power clock that provides a time-of-day clock and a calendar. The clock settings are maintained by an external battery source of 3 V. The system uses 242 bytes of memory to store complementary metal-oxide semiconductor (CMOS) memory. Moving a jumper (J6) on the system board erases CMOS memory. To locate the battery or J18, see "System Board" on page 13. Chapter 2. System Board Features 11

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Chapter 2.
System Board Features
Network Connection
Some models have a Crystal CS8920 Ethernet 10BASE-T controller and an RJ-45 connector integrated on
the system board that provides a high-performance LAN connection.
This integrated Ethernet is an ISA
Plug and Play device with built-in support for Wake on LAN.
Some models are equipped with an Ethernet or token-ring adapter.
Features of the Ethernet adapter are:
±
Operation in shared 10BASE-T or 100BASE-TX environment
±
Transmits and receives data at 10 Mbps or 100 Mbps
±
RJ-45 connector for LAN attachment
±
Operates in symmetrical multiprocessing (SMP) environments
±
Wake on LAN support
±
Remote Program Load (RPL) support
Note:
The following information is for PC
300GL 6272 Without Diskette Drive computers:
For operation of the computer within FCC Class A limits, you must use category 5 network cabling
at 10 Mbps or 100 Mbps.
Features of the token-ring adapter are:
±
Transmits and receives data at 4 Mbps or 16 Mbps
±
RJ-45 and D-shell connectors for LAN attachment
±
Wake on LAN support
±
Remote Program Load (RPL) support
General Purpose I/O Ports
The system board has up to 16 general purpose input/output (GPIO) pins which are implemented by two
8-bit GPIO ports.
The use of GPIO pins is dependent upon system design.
Features of the GPIO ports
are:
±
Open-drain outputs with internal pull-ups and transistor-transistor logic (TTL) inputs
±
Base address is software configurable
±
Direction is programmable
±
Occupies 4-byte I/O address
Real-Time Clock and CMOS
The real-time clock is a low-power clock that provides a time-of-day clock and a calendar.
The clock
settings are maintained by an external battery source of 3 V.
The system uses 242 bytes of memory to store complementary metal-oxide semiconductor (CMOS)
memory.
Moving a jumper (J6) on the system board erases CMOS memory.
To locate the battery or J18, see “System Board” on page
13.
Chapter 2.
System Board Features
11