Table 3.15 decode of mad pins, Decode of mad pins – Avago Technologies LSI53C895A User Manual
Page 108
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3-20
Signal Descriptions
•
MAD[3:1] – These pins are used to set the size of the external
expansion ROM device attached. Encoding for these pins are listed
in
(“0” indicates a pull-down resistor is attached, “1”
indicates a pull-up resistor is attached).
•
MAD[0] – This pin is the slow ROM pin. When pulled up, it enables
two extra cycles of data access time to allow use of slower memory
devices.
Note:
All MAD pins have internal pull-down resistors.
Table 3.15
Decode of MAD Pins
MAD[3:1]
Available Memory Space
000
16 Kbyte
001
32 Kbyte
010
64 Kbyte
011
128 Kbyte
100
256 Kbyte
101
512 Kbyte
110
1024 Kbyte
111
no external memory present
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