668-0003-C Rabbit Semiconductor, 668-0003-C Datasheet - Page 224
![no-image](/images/no-image-200.jpg)
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
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
668-0003-C
Manufacturer:
Rabbit Semiconductor
Quantity:
10 000
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B.2.13 Early Memory Output-Enable Feature
The early I/O enable feature was added to the Rabbit 2000C revision to relax the tight tim-
ing requirements for memory access when using the clock spectrum spreader. The early
I/O option extends the output enable time for the /OEx strobes and the write enable time
for the /WEx strobes by a half clock cycle. The Memory Timing Control Register
(MTCR) enables the extended timing for the memory output enable and write enable
strobes.
Memory read and write timing are discussed further in Chapter 15, “AC Timing Specifica-
tions.”
218
7:4
3
2
1
0
Bit(s)
Memory Timing Control Register
xxxx
0
1
0
1
0
1
0
1
Value
Table B-12. Memory Timing Control Register
These bits are reserved and should not be used.
Normal timing for /OE1B (rising edge to rising edge, one clock minimum).
Extended timing for /OE1B (one-half clock earlier than normal).
Normal timing for /OE0B (rising edge to rising edge, one clock minimum).
Extended timing for /OE0B (one-half clock earlier than normal).
Normal timing for /WE1B (rising edge to falling edge, one and one-half clocks
minimum).
Extended timing for /WE1B (falling edge to falling edge, two clocks
minimum).
Normal timing for /WE0B (rising edge to falling edge, one and one-half clocks
minimum).
Extended timing for /WE0B (falling edge to falling edge, two clocks
minimum).
Description
(MTCR)
Rabbit 2000 Microprocessor User’s Manual
(Address = 0x19)
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