
DS785UM1 13-11
Copyright 2007 Cirrus Logic
SDRAM, SyncROM, and SyncFLASH Controller
EP93xx User’s Guide
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
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