Page 12

Epson Research and Development

 

Vancouver Design Center

 

 

4 VR4102/VR4111 to S1D13705 Interface

4.1 Hardware Description

The NEC VR4102/VR4111 Microprocessor is specifically designed to support an external LCD controller by providing the internal address decoding and control signals necessary. By using the Generic # 2 interface, no glue logic is required to interface the S1D13705 and the NEC VR4102/VR4111. A pull-up resistor is attached to WAIT# to speed up its rise time when terminating a cycle.

The following diagram shows a typical implementation of the VR4102/VR4111 to

S1D13705 interface.

NEC VR4102/VR4111

S1D13705

WR#

SHB#

RD#

LCDCS#

LCDRDY

ADD[16:0]

DATA[15:0]

BUSCLK

Note:

Pull-up

System RESET

Vcc

Vcc

WE0#

WE1#

RD#

CS#

WAIT#

RESET#

AB[16:0]

DB[15:0]

BUSCLK

BS#

RD/WR#

When connecting the S1D13705 RESET# pin, the system designer should be aware of all conditions that may reset the S1D13705 (e.g. CPU reset can be asserted during wake-up from power-down modes, or during debug states).

Figure 4-1: Typical Implementation of VR4102/VR4111 to S1D13705 Interface

S1D13705

Interfacing to the NEC VR4102/VR4111 Microprocessor

X27A-G-008-02

Issue Date: 01/02/13

Page 430
Image 430
Epson technical manual VR4102/VR4111 to S1D13705 Interface, Busclk BS# RD/WR#