SNR032 Просмотр технического описания (PDF) - Sonix Technology Co., Ltd

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SNR032

32M-bit Mask ROM

Sonix Technology Co., Ltd 

SNR032

32M-bit Mask ROM

4. BUS INTERFACE

SNR032 provides three different bus modes to connect to host CPU, AD-bus mode,

byte mode and word mode. And the switching between different modes is depended

on the pin option “TYPE” and “MODE”. The following table is shown the relation ship of

“TYPE”, “MODE” pins and mode switching.

Mode

AD-Bus Interface

Byte Mode Interface

Word Mode Interface

TYPE pin

VDD

GND

GND

MODE pin

Don’t care

GND

VDD

4.1 AD-Bus Interface

For 8-bit AD (address/data) bus interface, all the address and data communication

between SNC710 and SNR032 are through data bus D[0..7]. SNC710 allows user to

connect maximum 2 external mask ROM. The option pin “TYPE” must connected to

VDD then the AD-bus interface to be enable. In AD-Bus mode, SNR032 has three

bank select pins BS2~BS4 to specify the memory region of SNR032. The address

region setting of SNR032 is shown as bellow.

BS4~BS2

001

010

011

100

101

110

111

Address Region

0x0200000 ~ 0x03FFFFF

0x0400000 ~ 0x05FFFFF

0x0600000 ~ 0x07FFFFF

0x0800000 ~ 0x09FFFFF

0x0A00000 ~ 0x0BFFFFF

0x0C00000 ~ 0x0DFFFFF

0x0E00000 ~ 0x0FFFFFF

Table-1

Note: For the address region 0x00000~0x01FFFFF are reserved, so the setting

of bank select pins BS4~BS2 CAN’T be the range 0000~0x0011.

Ver. 1.2

4

October 21, 2005

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