w83c554f Winbond Electronics Corp America, w83c554f Datasheet - Page 23

• Manufacturer Part Number: w83c554f
• Description: System I/o Controller With Pci Arbiter & Ultradma/33 Ide Controller
• Manufacturer: Winbond Electronics Corp America

W83C554F
WINBOND ELECTRONICS CORP. AMERICA
Pin Name
IOR#
IOW#
SMEMR#
SMEMW#
ZWS#
SBHE#
M16#
IO16#
IOCHK#
Pin #
140
139
138
137
132
174
175
177
122
Table 2-5 (Continued). ISA Bus Signals
Input/
Output
Input/
Output
Input/
Output
Output
Output
Input
Input/
Output
Input/
Output
Input
Input
Description
I/O Read. Act as an output during PCI master and DMA cycles and
as an input during ISA master cycles.
I/O Write. Act as an output during PCI master and DMA cycles and
as input during ISA master cycles.
Memory Read To Address Below 1M.
Memory Write To Address Below 1M.
Zero Wait State. This signal is used by ISA slaves to terminate a
transfer cycle before the default ready counter expires.
System Byte High Enable. SBHE# is asserted to indicate that data
is being transferred on SD[15:8].
Memory Cycle 16-Bit Select. This signal is used by memory slaves
to indicate 16-bit transfer capability.
I/O Cycle 16-Bit Select. This signal is used by I/O slaves to
indicate 16-bit transfer capability.
I/O Channel Check. This assertion of this signal indicates an error
has occurred.
Pin Descriptions
21