SNL310 Просмотр технического описания (PDF) - Sonix Technology Co., Ltd

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производитель

SNL310

16-Bit LCD Controller

Sonix Technology Co., Ltd 

SNL310

16-Bit LCD Controller

8. EXTENSION BUS

SNL310 totally provides 64 I/O pins, those I/O pins can be configured to be address,

data and control signal of extension bus except P2.0~P2.15 are the dedicated general

I/O pins. Table-1 shows the relation among P3.5~P3.15, P4.0~P4.15, P5.0~P5.7 and

I/O pins.

I/O Pin

P3.10

P3.15

P3.11~P3.14

P4.0~P4.15

P5.0~P5.5

P5.6

P5.7

P5.8~P5.15

Extension Bus

E_R

A[22]

CS3~CS0

A[0..15]

A[16..21]

WR/RD

RD/E

D[0..7]

Descriptions

RD signal for 6800 interface

Address pin of 16-bit mode memory accessing

Chip select pin

Address bus

Address bus

Write signal

Read signal

Data bus

Table-1

SNL310 provides four chip select pins for external devices, each chip select pin can be

connected to memory device or LCD driver. Besides, all the address, data and control

pins of extension bus are shared with general I/O pins. Normally, the default setting is

general I/O pins for extension bus. User just need to set the enable control bit of

extension bus then all the corresponding I/O pins will switch to be extension bus

automatically.

8.1 Extension Bus for External Memory Device

SNL310 provides two access modes for external memory device. One is 8-bit mode

and another one is 16-bit mode. User has to use 16-bit mode if executed user’s

program is from external memory. Most important of all, SNL310 only can execute

user’s program from the first external device. So user has to connect Mask ROM or

Flash which already burn-in user’s program to the “CS1”

A0

A0

A0

A0

A21

A21

A22

CS1

CE\

A22

A22

CS1

CE\

SNL310

mask ROM/

Flash

SNL310

mask ROM/

Flash

8-bit Mode of Extension Bus

16-bit Mode of Extension Bus

Figure-5

Ver: 1.7

8

May 2, 2003

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