Avago Technologies LSI53C1020 - Manual (Page 50)

2-24 Functional Description
Version 2.4 Copyright © 2001–2004 by LSI Logic Corporation. All rights reserved.
pins. By default, internal logic pulls these pins down to indicate that no
Flash ROM is present.
The LSI53C1020 defines only the middle (MA[15:8]) and lower (MA[7:0])
address ranges if the Flash ROM addressable space is 64 Kbytes or
less. The LSI53C1020 defines the upper (MA[21:16]), middle (MA[15:8]),
and lower (MA[7:0]) address ranges if the Flash ROM addressable space
is 128 Kbytes or more.
Figure 2.4 provides an example of a Flash ROM
configuration.
Table 2.3 Flash ROM Size Programming
MAD[2:1] Options Flash ROM Size
0b00 No Flash ROM present (Default)
0b01 Up to 1024 Kbytes
1
1. Choose this setting for a 128 Kbyte or 512 Kbyte Flash ROM.
0b10
Reserved
0b11