Samsung 164BX user manual ISA I/O Address Map, Flash ROM Address Map

ISA I/O Address Map

Table 6–1 ISA Interrupts (Sheet 2 of 2)

Interrupt Number Interrupt Source

IRQ13Available

IRQ14IDE

IRQ15IDE

1The # symbol indicates an active low signal.

6.2ISA I/O Address Map

Table 6–2 lists the Alpha 164UX ISA I/O space address mapping.

Table 6–2 ISA I/O Address Map

Range (hex)	Usage
060-060	i8042 PRT
064-064	i8042 PRT
1F0-1F7	ATAPI
2F8-2FE	Serial port—COM2
378-37B	Parallel Port—LPT2
3F0-3F5	Floppy
3F6-3F6	ATAPI
3F7-3F7	Floppy
3F8-3FE	Serial port—COM1

6.2.1 Flash ROM Address Map

The flash ROM is mapped to three regions of memory. Access to the first two regions is RO. The first two regions provide the software necessary to initialize the system and transfer execution to the next level of software. When power is turned on, address ranges 0 to 00.00FF.FFFF and 0F.FC00.0000 to 0F.FFFF.FFFF are enabled. After the system has been initialized, these two address ranges are disabled. Byte mode is then enabled in the 21164 and 21174. Byte mode is the only way to access the flash ROM in address range 87.C000.0000 to 87.FFFF.FFFF. 21164 byte

6–2Interrupts and ISA Bus Addresses