Intel 80C188XL - Manual (Page 169)

CHIP-SELECT UNIT
6-14
Figure 6-10. MCS3:0 Active Ranges
Table 6-5. MCS Block Size and Start Address Restrictions
MPCS Block Size Bits
Block Size
(Kbytes)
MMCS Start Address
Restrictions
M6 M5 M4 M3 M2 M1 M0
0 0 0 0 0 0 1 8 None
0 0 0 0 0 1 X 16 U13 must be zero.
0 0 0 0 1 X X 32 U14:13 must be zero.
0 0 0 1 X X X 64 U15:13 must be zero.
0 0 1 X X X X 128 U16:13 must be zero.
0 1 X X X X X 256 U17:13 must be zero.
1 X X X X X X 512 U18:13 must be zero.
NOTE: If U19 is one, will overlap UCS.
X= don’t care, but should be 0 for future compatibility.
MCS3 Active Range
MCS2 Active Range
MCS1 Active Range
MCS0 Active Range
Base + (Block Size-1)
Base + (3/4 Block Size-1)
Base + (1/2 Block Size-1)
Base + (1/4 Block Size-1)
Base + 3/4 Block Size
Base + 1/2 Block Size
Base + 1/4 Block Size
Memory Map
MCS Base
(Defined by U19:13)
Block Size is
defined by M6:0
Starting Address Ending Address
A1136-0C