Cirrus Logic EP93xx - Manual (Page 507)

DS785UM1 13-11
Copyright 2007 Cirrus Logic
SDRAM, SyncROM, and SyncFLASH Controller
EP93xx User’s Guide
1
3
1
3
13
that AD23 is not used (needed) in either the row or column address, and this demonstrates
why the memory map for synchronous memory devices may be non-continuous.
Table 13-11 shows the continuous address ranges used by a variety of different synchronous
memory configurations. Note that in the “Continuous Address Range Per Segment” column,
the value N can be 0x0, 0xC, 0xD, 0xE or 0xF as shown in
Table 13-12 .
Table 13-10. Memory Addressing Example
Muxing
Scheme
B1 B0
AD
13
AD
12
AD
11
AD
10
AD
9
AD
8
AD
7
AD
6
AD
5
AD
4
AD
3
AD
2
AD
1
AD
0
16-Bits
Data
ROW /
BANK
A27 A26 A22 A21 A20 A19 A18 A17 A16 A15 A14 A13 A12 A11 A10 A9
COLUMN - - - - - AP A25 A24 A8 A7 A6 A5 A4 A3 A2 A1