668-0011 Rabbit Semiconductor, 668-0011 Datasheet - Page 49

• Manufacturer Part Number: 668-0011
• Description: IC MPU RABIT3000A 55.5MHZ128LQFP
• Manufacturer: Rabbit Semiconductor

Specifications of 668-0011

• Rohs Status: RoHS non-compliant
• Processor Type: Rabbit 3000 8-Bit
• Speed: 55.5MHz
• Voltage: 2.5V, 2.7V, 3V, 3.3V
• Mounting Type: Surface Mount
• Package / Case: 128-LQFP
• Features: -
• Other names: 316-1043

5. M
M
EMORY
ANAGEMENT
5.1 Overview
The Rabbit 3000 supports 8-bit external flash and SRAM devices; three chip selects and
two read/write-enable strobes allow up to six external devices to be attached at once. The
8-bit mode allows 0, 1, 2, or 4 wait states to be specified for each device.
The Rabbit 3000’s physical memory space contains four consecutive banks, each of which
can be mapped to an individual chip-select/enable strobe pair. The banks can be set for
equal sizes ranging from 128 KB up to 4 MB, providing a total physical memory range
from 512 KB up to 16 MB. Figure 5-1 shows a sample configuration.
Figure 5-1. Mapping Rabbit 3000 Physical Memory Space
Chapter 5 Memory Management
39