Ichip2 Asic; Southbridge Asic; Superi/O Functions; Serial Port - Sun Microsystems Sun Blade 100 Service Manual

C.2.2

IChip2 ASIC

IChip2 is a 128-pin thin quad flat package (TQFP) ASIC which functions as an
interrupt concentrator. The interrupt concentrator is capable of processing 11 major
groups of interrupts comprising a total of 48 different interrupt signals at the same
time. The result is a 6-bit encoding, which designates the source of the interrupt. The
IChip2 can prioritize the interrupts based on the round-robin scheduling scheme. It
also supports three types of interrupts: level high, level low, and pulse low.
C.2.3

SouthBridge ASIC

The Sun Blade 100 system uses the SouthBridge ASIC which is a highly integrated
system I/O chip set in a 328-pin, ball grid array (BGA) package. It has the following
integrations:
PCI to ISA bridge
SuperI/O interface
PCI IDE controller (UltraDMA 66)
AC97-compliant audio interface
SMBus (I2C) interface
C.2.3.1

SuperI/O Functions

Serial Port

The serial port is a 16450/16550-compatible UAR with 16-byte FIFOs. The serial port
has a programmable baud rate generator and contains dedicated pins and a COM
port for infrared transmissions.

Parallel Port

The parallel port supports ECP/EPP/PS/2/SPP and IEEE 1284 compliance.
Floppy Drive Controller (FDC)
The floppy drive controller (FDC) is software compatible with 82077 and supports
16-byte data FIFOs. The interface supports standard 1 Mbit/sec, 500 Kbit/sec, 300
Kbit/sec, 250 Kbit/sec data transfer rates.
C-4 Sun Blade 100 Service Manual • October 2000