S1D13505 Epson Electronics America, Inc., S1D13505 Datasheet - Page 480
S1D13505
Manufacturer Part Number
S1D13505
Description
LCD Controller
Manufacturer
Epson Electronics America, Inc.
Datasheet
1.S1D13505.pdf
(566 pages)
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Page 8
2 Interfacing to the VR4102/VR4111
2.1 The NEC VR4102/VR4111 System Bus
2.1.1 Overview
S1D13505
X23A-G-007-06
The VR-Series family of microprocessors features a high-speed synchronous system bus
typical of modern microprocessors. Designed with external LCD controller support and
Windows CE based embedded consumer applications in mind, the VR4102/VR4111 offers
a highly integrated solution for portable systems. This section provides an overview of the
operation of the CPU bus in order to establish interface requirements.
The NEC VR4102/VR4111 is designed around the RISC architecture developed by MIPS.
This microprocessor is based on the 66MHz VR4100 CPU core which supports 64-bit
processing. The CPU communicates with the Bus Control Unit (BCU) using its internal
SysAD bus. The BCU in turn communicates with external devices using its ADD and DAT
buses which can be dynamically sized for 16 or 32-bit operation.
The NEC VR4102/VR4111 has direct support for an external LCD controller. Specific
control signals are assigned for an external LCD controller providing an easy interface to
the CPU. A 16M byte block of memory is assigned for the LCD controller and its own chip
select and ready signals are available. Word or byte accesses are controlled by the system
high byte signal (SHB#).
Interfacing to the NEC VR4102/VR4111™ Microprocessors
Epson Research and Development
Vancouver Design Center
Issue Date: 01/02/05
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