Rabbit 6000 User’s Manual
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31.1.2 I/O Strobes
There are eight I/O strobes available in the Rabbit 6000. Each has a separate 8KB address range that can
be enabled as a chip select, read strobe, write strobe, or a read/write strobe. The number of wait states can
be set to 1, 3, 7, or 15, and the signal can be active high or low. The timing can also be adjusted using
IBxER to change the frequency of the clock driving the External I/O interface.
The I/O strobes can be used for devices on the memory bus or the external I/O bus. It is also possible to
shorten the read strobe by one clock cycle and the write strobe by one-half a clock cycle by pulling in the
trailing edge, which guarantees one clock cycle of hold time for transactions.
Figure 31.1 External I/O Bus Cycles
The strobes can be enabled to come out on Parallel Ports C, D, E, F, G or H.
Table 31-1. External I/O Strobes
Register
External I/O Address Range
IB0CR
0x0000–0x1FFF
IB1CR
0x2000–0x3FFF
IB2CR
0x
4
000–0x5FFF
IB3CR
0x6000–0x7FFF
IB4CR
0x8000–0x9FFF
IB5CR
0xA000–0xBFFF
IB6CR
0xC000–0xDFFF
IB7CR
0xE000–0xFFFF
Summary of Contents for 6000
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