Chapter 2. Getting Started
13
8905F02-01
LOCAL DRAM
PCI / STD 32
PCI / STD 32
PCI / STD 32
PCI / STD 32
PCI / STD 32
BIOS SHADOW
LOCAL DRAM
PCI
PCI / STD 32
DRAM / PCI /
STD 32
†
4000000h-3FFFFFFFh
800000h-3FFFFFFh
100000h-7FFFFFh
E0000h-FFFFFh
D8000h-DFFFFh
D0000h-D7FFFh
C8000h-CFFFFh
C0000h-C7FFFh
A0000h-BFFFFh
0h-9FFFFh
†
For DRAM configurations greater than 8 Mbyte, this region
should be dedicated to PCI and not STD 32. It is
40000000h-3FFFFFFFFh
4 Gbyte
1 Gbyte
64 Mbyte
8 Mbyte
1 Mbyte
896 Kbyte
864 Kbyte
832 Kbyte
800 Kbyte
768 Kbyte
640 Kbyte
0
recommended that EA memory peripherals be located
between 64 Mbyte and 1 Gbyte.
Memory Address Map
I/O CONFIGURATION
The ZT 8905 addresses up to 64 Kbytes of I/O using a 16-bit I/O address. The address space is
divided between I/O local to the board and I/O on the STD bus. Any I/O space not occupied by a local
I/O device or STD bus is available for PCI bus expansion. The I/O address regions available for the
STD bus are configured through the BIOS SETUP utility (discussed in the section "ZT 8905 SETUP"
later in this chapter). During local I/O operations, the STD bus is held static to decrease system
electrical noise and power consumption.
STD bus I/O is supported through either Standard Architecture (SA8 or SA16) transfers, or Extended
Architecture (EA8, EA16, or EA32) transfers. The ZT 8905 supports the STD bus wait request signal,
WAITRQ*, to interface to I/O boards with longer access time requirements than those defined by the
STD-80 and STD 32 specifications. The signal EXRDY is supported for EA peripherals that require
additional transfer time.
The STD bus I/O expansion signal, IOEXP, is also supported. The IOEXP signal is automatically
driven low over the I/O address range FC00h to FFFFh. Application software should use this address
range to access STD bus I/O boards decoding IOEXP and fewer than 16 bits of address to prevent
the board from being redundantly mapped throughout the 64 Kbyte I/O address space.
The ZT 8905 is populated with many of the most commonly used I/O peripheral devices for industrial
control and computing applications. The I/O address location for each of the peripherals is shown in
the "I/O Address Map" illustration on the following page.
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Содержание ZT 8905
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