參數(shù)資料
型號: W83C554F
英文描述: W83C554F Highly Integrated System I/O Controller for Power PC TM (South Bridge) & UltraDMA/33 IDE Controller QFP 208
中文描述: W83C554F高度集成的系統(tǒng)的I / O控制器的Power PC商標(biāo)(南橋)
文件頁數(shù): 24/159頁
文件大小: 3991K
代理商: W83C554F
W83C553F
Pin Descriptions
WINBOND SYSTEMS LABORATORY
21
Table 2-5. ISA Bus Signals
Pin Name
BCLK
Pin #
Input/
Output
Description
ISA Bus Clock.
Oscillator. 14 MHz input for generating the internal timer clock.
Latchable Address. The current bus owner drives LA[23:17] to
provide 16M of memory space.
200
Output
OSC
172
Input
LA[23:17]
176,178,
180,182,
184,187,
189
144,145,
147-149,
151,152,
155,158,
160,162,
164,165,
167,169,
171,173
143
Input/
Output
SA[16:0]
Input/
Output
System Address. SA[16:0] provides the 17 least significant address
bits for memory accesses and SA[15:0] provides the entire 16
address bits for I/O accesses.
MASTER#
REFRESH#
Input
ISA Master. Master control signal from the ISA bus.
ISA DRAM Refresh Control. This pin is an open drain output and
allows other masters to initiate refresh requests.
Memory Read. Acts as an output during PCI master and DMA
cycles and as an input during ISA master cycles.
Memory Write. Acts as an output during PCI master and DMA
cycles and as an input during ISA master cycles.
150
Input/
Output
MEMR#
141
Input/
Output
MEMW#
142
Input/
Output
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