Specifications

CHAPTER 4
Expansion Modules
RAM Expansion Cards 45
Table 4-10 Address multiplexing for some typical DRAM devices
Individual signals on DRAM address bus
Type of DRAM device [11] [10] [9] [8] [7] [6] [5] [4] [3] [2] [1] [0]
4 M by 1 or 4 M by 4;
11 row bits, 11 column bits
Row address bits 21 22 20 18 17 16 15 14 13 12 11 10
Column address bits 19 23211998765432
Device address pins —109876543210
2 M by 8; 12 row bits, 9 column bits
Row address bits 21 22 20 18 17 16 15 14 13 12 11 10
Column address bits 19 23 21 1998765432
Device address pins 11109876543210
2 M by 8; 11 row bits, 10 column bits
Row address bits 21 22 20 18 17 16 15 14 13 12 11 10
Column address bits 19 23 211998765432
Device address pins —109876543210
1 M by 4 or 1 M by 16;
11 row bits, 9 column bits
Row address bits 21 22 20 18 17 16 15 14 13 12 11 10
Column address bits 19 23 21 1998765432
Device address pins 10—9876543210
1 M by 4 or 1 M by 16;
10 row bits, 10 column bits
Row address bits 21 22 20 18 17 16 15 14 13 12 11 10
Column address bits 19 23 211998765432
Device address pins ——9876543210
512K by 8;
10 row bits, 9 column bits
Row address bits 21 22 20 18 17 16 15 14 13 12 11 10
Column address bits 19 23 21 1998765432
Device address pins ——9876543210