SNR016 Datasheet, PDF (4/9 Pages) SONiX Technology Company – 16M-bit Mask ROM

SNR016
16M-bit Mask ROM
4. MEMORY MAPPING
For 8-bit AD (address/data) bus interface, all the address and data communication
between SNC710 and SNR016 are through data bus D[0..7]. SNC710 allows user to
connect maximum 2 external mask ROM, and SNR016 has 4 bank select pins
(BS1~BS4) to specify the memory region of each mask ROM.
BS4~BS1
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
Address Region
0x0200000 ~ 0x02FFFFF
0x0300000 ~ 0x03FFFFF
0x0400000 ~ 0x04FFFFF
0x0500000 ~ 0x05FFFFF
0x0600000 ~ 0x06FFFFF
0x0700000 ~ 0x07FFFFF
0x0800000 ~ 0x08FFFFF
0x0900000 ~ 0x09FFFFF
0x0A00000 ~ 0x0AFFFFF
0x0B00000 ~ 0x0BFFFFF
0x0C00000 ~ 0x0CFFFFF
0x0D00000 ~ 0x0DFFFFF
0x0E00000 ~ 0x0EFFFFF
0x0F00000 ~ 0x0FFFFFF
Table-1
Note: For the address region 0x00000~0x01FFFFF are reserved, and the setting
of bank select pins BS4~BS1 CAN’T be the range 0000~0x0001.
Ver. 1.4
4
October 21, 2005