W83628AG Nuvoton Technology Corporation of America, W83628AG Datasheet - Page 19

• 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

IOW#
IOCHRDY
SYSCLK
RSTDRV
IOCS16#
SBHE#
IOCHK#
MEMR#
MEMW#
MASTER#
LA[23:17]
SYMBOL
127-125
121
116
124
105
PIN
5-2
99
74
18
17
6
7
OUT 18t
OUT 18t
I/O 18t
I/O 18t
I/O 18t
I/O 18t
I/O 18t
I/O 18t
I/O
IN t
IN t
IN t
I/O Write. IOW# is the command to an ISA I/O
slave device that the slave may latch data from the
ISA data bus (SD[15:0]).
I/O Channel Ready. Resources on the ISA Bus
negate IOCHRDY to indicate that additional time
(wait states) is required to complete the cycle.
ISA System Clock. SYSCLK is the reference clock
for the ISA bus. The SYSCLK is generated by
dividing PCICLK by 3 or 4.
Reset Drive. The W83628AG asserts RSTDRV to
reset devices that reside on the ISA Bus. The
W83628AG asserts this signal while the PCIRST#
is asserted.
16-bit I/O Chip Select. This signal is driven by I/O
devices on the ISA Bus to indicate that they support
16-bit I/O bus cycles.
System Byte High Enable. SBHE# asserted
indicates that a byte is being transferred on the
upper byte (SD[15:8]) of the data bus. SBHE# is at
an unknown state upon PCIRST#.
resource on the ISA bus during the detection of an
error.
Memory Read. MEMR# asserted indicates the
current ISA bus cycle is a memory read.
Memory Write. MEMW# asserted indicates the
current ISA bus cycle is a memory write.
MASTER#. This signal is used with a DREQ line by
an ISA master to gain control over the ISA Bus.
Unlatched Address. The LA[23:17] address lines
are bi-directional. These address lines allow
accesses to physical memory on the ISA Bus up to
16 Mbytes. LA[23:17] are outputs when the
W83628AG owns the ISA Bus.
I/O Channel Check. IOCHK# can be driven by any
- 14 -
W83628AG & W83629AG
FUNCTION
Publication Release Date: January, 2008
Revision 1.2
LEVEL
5V
5V
5V
5V
5V
5V
5V
5V
5V
5V
5V