Rev. 5.00, 12/03, page 141 of 1088
6.1.3
Pin Configuration
Table 6-1 summarizes the pins of the bus controller.
Table 6-1
Bus Controller Pins
Name
Symbol I/O
Function
Address strobe
AS
Output
Strobe signal indicating that address output
on address bus is enabled.
Read
RD
Output
Strobe signal indicating that external space
is being read.
High write
HWR
Output
Strobe signal indicating that external space
is to be written, and upper half (D
15
to D
8
)
of data bus is enabled.
Low write
LWR
Output
Strobe signal indicating that external space
is to be written, and lower half (D
7
to D
0
) of
data bus is enabled.
Chip select 0
CS0
Output
Strobe signal indicating that area 0 is
selected.
Chip select 1
CS1
Output
Strobe signal indicating that area 1 is
selected.
Chip select 2
CS2
Output
Strobe signal indicating that area 2 is
selected.
Chip select 3
CS3
Output
Strobe signal indicating that area 3 is
selected.
Chip select 4
CS4
Output
Strobe signal indicating that area 4 is
selected.
Chip select 5
CS5
Output
Strobe signal indicating that area 5 is
selected.
Chip select 6
CS6
Output
Strobe signal indicating that area 6 is
selected.
Chip select 7
CS7
Output
Strobe signal indicating that area 7 is
selected.
Wait
WAIT
Input
Wait request signal when accessing
external 3-state access space.
Bus request
BREQ
Input
Request signal that releases bus to
external device.
Bus request acknowledge
BACK
Output
Acknowledge signal indicating that bus has
been released.
Bus request output
BREQO
Output
External bus request signal used when
internal bus master accesses external
space when external bus is released.
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