668-0003-C Rabbit Semiconductor, 668-0003-C Datasheet - Page 64
668-0003-C
Manufacturer Part Number
668-0003-C
Description
IC CPU RABBIT2000 30MHZ 100PQFP
Manufacturer
Rabbit Semiconductor
Datasheet
1.20-668-0003.pdf
(228 pages)
Specifications of 668-0003-C
Rohs Status
RoHS non-compliant
Processor Type
Rabbit 2000 8-Bit
Speed
30MHz
Voltage
2.7V, 3V, 3.3V, 5V
Mounting Type
Surface Mount
Package / Case
100-MQFP, 100-PQFP
Features
-
Other names
316-1004
668-0003
668-0003
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Part Number:
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Manufacturer:
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5.4 Bus Timing
The external bus has essentially the same timing for memory cycles or I/O cycles. A
memory cycle begins with the chip select and the address lines. One clock later, the out-
put enable is asserted for a read. The output data and the write enable are asserted for a
write.
In some cases, the timing shown in Figure 5-4 may be prefixed by a false memory access
during the first clock, which is followed by the access sequence shown in Figure 5-4. In
this case, the address and often the chip select will change values after one clock and
assume the final values for the memory to be actually accessed. Output enable and write
enable are always delayed by one clock from the time the final, stable address and chip
select are enabled. Normally the false memory access attempts to start another instruction
access cycle, which is aborted after one clock when the processor realizes that a read data
or write data bus cycle is needed. The user should not attempt a design that uses the chip
select or a memory address as a clock or state changing signal without taking this into con-
sideration.
58
Notes:
Read may have no wait states.
Write cycles and I/O read cycles have at least 1 wait state. Clock
may be asymmetric if clock doubler used. I/O chip select avail-
able on port E as option.
T1
Tw
Figure 5-4. Bus Timing Read and Write
T2
valid
Address (20 for memory, 16 for I/O)
Data for write 3-s drive starts at end of T1
/OEn or /IORD and /BUFEN (/BUFEN rd or wr)
Data for read
/WEn or /IOWR
/IOCSn or /CSn
Rabbit 2000 Microprocessor User’s Manual
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