W83628AG Nuvoton Technology Corporation of America, W83628AG Datasheet - Page 18

• Manufacturer Part Number: W83628AG
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of W83628AG

• Operating Temperature (min): 0C
• Operating Temperature Classification: Commercial
• Operating Temperature (max): 70C
• Rad Hardened: No
• Lead Free Status / RoHS Status: Compliant

9.1.2
9.1.3
HS[2:0]
ISOLATE#
NOGO
SA[19:17]
SA[16:0]
SD[15:0]
AEN
IOR#
SYMBOL
SYMBOL
Control Logic and Handshaking Signals
ISA Interface Signals
110-107,
104,103,
101,100,
112-114
98-96
94-83
81-77
8-15
118
120
PIN
PIN
72
76
OUT 18t
I/O 10t
I/O18t
I/O 18t
I/O 18t
I/O 18t
IN ts
I/O
IN t
I/O
Handshaking Signals. HS[2:0] are connected to
the W83629AG for PCI to ISA SET handshaking
signals.
HS1 is handshaking Signal 1; this pin is weak
pulled-down while PCIRST# is asserted.
Applying a pull-up resistor (4.7Kohm) to this pin
disables ISA bridge subtraction decoder.
Isolation Control Input. Isolate# is an active low
signal by user programming to control all of the
output signals of the W83628AG to Isolation and
Tri-state.
NOGO, This signal indicates which master initiates
the current transaction and whether or not the
current bus cycle is targeted for the ISA bus. This
signal is a point-to-point connection between PCI
HOST Bridge and the W83628AG.
System Address Bus. These are the upper
address lines that define the ISA’s byte granular
address space (up to 1 Mbyte). SA[19:17] are at an
unknown state upon PCIRST#.
System Address Bus. These are the bi-directional
lower address lines that define the ISA’s byte
granular address space (up to 1 Mbyte). SA[16:0]
are at an unknown state upon PCIRST#.
System Data. SD[15:0] provide the 16-bit data path
for devices residing on the ISA Bus. The
W83628AG tri-states SD[15:0] during PCIRST#.
Address Enable. AEN is asserted during DMA
cycles. This signal is also driven high when the
W83628AG initiates refresh cycles. AEN is driven
low upon PCIRST#.
I/O Read. IOR# is the command to an ISA I/O slave
device that the slave may drive data on to the ISA
data bus (SD[15:0]).
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W83628AG & W83629AG
FUNCTION
FUNCTION
Publication Release Date: January, 2008
Revision 1.2
LEVEL
LEVEL
3.3V
5V
5V
5V
5V
5V
5V
5V