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Chapter 27 External I/O Control
323
I/O Bank x Control Register
(IB0CR)
(Address = 0x0080)
(IB1CR)
(Address = 0x0081)
(IB2CR)
(Address = 0x0082)
(IB3CR)
(Address = 0x0083)
(IB4CR)
(Address = 0x0084)
(IB5CR)
(Address = 0x0085)
(IB6CR)
(Address = 0x0086)
(IB7CR)
(Address = 0x0087)
Bit(s)
Value
Description
7:6
00
Fifteen wait states for accesses in this bank.
01
Seven wait states for accesses in this bank.
10
Three wait states for accesses in this bank.
11
One wait state for accesses in this bank.
5:4
00
The I signal is an I/O chip select.
01
The I signal is an I/O read strobe.
10
The I signal is an I/O write strobe.
11
The I signal is an I/O data (read or write) strobe.
3
0
Writes are not allowed to this bank. Transactions are normal in every other way;
only the write strobe is inhibited.
1
Writes are allowed to this bank.
2
0
Active-low I signal.
1
Inverted (active-high) I signal.
1
0
Normal I/O transaction timing.
1
Shorten read strobe by one clock cycle and write strobe by one-half clock cycle.
Transaction length remains the same. This guarantees one clock cycle hold time
for both address and data for I/O transactions.
0
0
Use I/O bus if enabled.
1
Always use memory data bus.
Содержание Rabbit 5000
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