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2. Getting Started
ÛZIATECH
18
Airflow Requirements
15
25
35
45
55
65
75
80
Convection
100
200
300
400
500
(ft/min)
DX (33)
SX (25)
DX2(66)
Ambient Air Temp ( C)
H
E
A
T
S
I
N
K
A
I
R
V
E
L
O
C
I
T
Y
DX (33)
DX2(50)
Industrial
DX4(100)
ZT8907F02-01
MEMORY CONFIGURATION
The ZT 8907 can address up to 128 Mbytes of memory. The address space is divided
between memory local to the board and memory on the STD bus. Any memory not
reserved or occupied by a local memory device is available for STD bus expansion.
During local memory operations, the STD bus is held static to decrease system
electrical noise and power consumption.
STD bus memory is transferred at a rate of up to 1 Mbyte/second for 8-bit data and
2 Mbytes/second for 16-bit data. The ZT 8907 supports the STD bus wait request
signal, WAITRQ*, to interface to memory boards with longer access time requirements
than those defined by the STD 32 specifications.
The ZT 8907 is populated with several memory devices. Local DRAM plugs into one or
two 72-pin SO-DIMM (small outline-dual inline memory module) sockets. Each SO-
DIMM socket supports 4, 8, or 16 Mbytes of DRAM for a total of 32 Mbytes onboard.
Local flash memory is soldered directly to the board.
There is space for one or two 2 Mbyte flash devices for a total of 4 Mbytes onboard. A
socket is provided for an optional static RAM device (128 Kbytes) that may be battery
backed. For more information, see Chapter 16, "
". The
memory address map is shown in the "
" illustration below.