Table 3.13 external memory support, External memory support – Avago Technologies LSI53C825AE User Manual

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MAD Bus Programming

3-17

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MAD[0] – the slow ROM pin. When pulled down, it enables two extra
clock cycles of data access time to allow use of slower memory
devices.

Note:

All MAD pins have internal pull-up resistors.

Table 3.13

External Memory Support

MAD[3:1]

Available Memory Space

000

16 Kbytes

001

32 Kbytes

010

64 Kbytes

011

128 Kbytes

100

256 Kbytes

101

512 Kbytes

110

1024 Kbytes

111

No external memory present