20-668-0003 Rabbit Semiconductor, 20-668-0003 Datasheet - Page 224

• Manufacturer Part Number: 20-668-0003
• Description: IC CPU RABBIT2000 30MHZ 100PQFP
• Manufacturer: Rabbit Semiconductor

Specifications of 20-668-0003

• 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
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 30 MHz
• Operating Supply Voltage: 0 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Number Of Programmable I/os: 40
• Number Of Timers: 8 & 10 bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 20-668-0003; 316-1062

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)