Avago Technologies LSI53C1020 - Manual (Page 77)

Power-On Sense Pins Description 3-21
Version 2.4 Copyright © 2001–2004 by LSI Logic Corporation. All rights reserved.
•
MAD[2:1], Flash ROM Size – These pins program the size of the
Flash ROM memory. Refer to
Table 3.20 for the pin encoding. By
default, internal logic pulls these pins LOW to indicate that a Flash
ROM is not present in the system.
•
MAD[0], Reserved.
Table 3.20 Flash ROM Size Programming
MAD[2:1] Options Flash ROM Size
0b00 Flash ROM Not Present (Default)
0b01 Up to 1024 Kbytes
1
1. Choose this setting for a 128 Kbyte or 512 Kbyte Flash ROM.
0b10
Reserved
0b11