MC68306FC16 Datasheet, PDF (101/191 Pages) Motorola, Inc – Integrated EC000 Processor

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1111 = A31–A17 must match CSA31–CSA17 in chip select address match
Table 5-2 shows the entire range of address bits that must match for a chip select to
occur.
Table 5-2. Chip Select Match Bits
A31 A30 A29 A28 A27 A26 A25 A24 A23 A22 A21 A20 A19 A18 A17
0000 x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
0001 •
x
x
x
x
x
x
x
x
x
x
x
x
x
x
0010 •
•
x
x
x
x
x
x
x
x
x
x
x
x
x
0011 •
•
•
x
x
x
x
x
x
x
x
x
x
x
x
0100 •
•
•
•
x
x
x
x
x
x
x
x
x
x
x
0101 •
•
•
•
•
x
x
x
x
x
x
x
x
x
x
0110 •
•
•
•
•
•
x
x
x
x
x
x
x
x
x
0111 •
•
•
•
•
•
•
x
x
x
x
x
x
x
x
1000 •
•
•
•
•
•
•
•
x
x
x
x
x
x
x
1001 •
•
•
•
•
•
•
•
•
x
x
x
x
x
x
1010 •
•
•
•
•
•
•
•
•
•
x
x
x
x
x
1011 •
•
•
•
•
•
•
•
•
•
•
x
x
x
x
1100 •
•
•
•
•
•
•
•
•
•
•
•
x
x
x
1101 •
•
•
•
•
•
•
•
•
•
•
•
•
x
x
1110 •
•
•
•
•
•
•
•
•
•
•
•
•
•
x
1111 •
•
•
•
•
•
•
•
•
•
•
•
•
•
•
x = Address bit is a don’t care, CSA bit must be 0 to allow match.
• = Address bit must match CSA bit for chip select to occur.
CSDT3–0—Chip Select DTACK Wait State Selection
This field determines whether automatic DTACK is returned, and how many wait states
are inserted if automatic DTACK is enabled. When automatic DTACK is selected, the
write portion of a TAS indivisible cycle is the same length as a normal write cycle to the
same location. Any external DTACK generation circuit must recognize that AS remains
asserted throughout a read-write indivisible cycle, if it supports TAS.
0000 =
0001 =
0010 =
0011 =
0100 =
0101 =
0110 =
0111 =
Automatic DTACK, 0 wait states
Automatic DTACK, 1 wait state
Automatic DTACK, 2 wait states
Automatic DTACK, 3 wait states
Automatic DTACK, 4 wait states
Automatic DTACK, 5 wait states
Automatic DTACK, 6 wait states
Automatic DTACK, 7 wait states
1000 =
1001 =
1010 =
1011 =
1100 =
1101 =
1110 =
1111 =
Automatic DTACK, 8 wait states
Automatic DTACK, 9 wait states
Automatic DTACK, 10 wait states
Automatic DTACK, 11 wait states
Automatic DTACK, 12 wait states
Automatic DTACK, 13 wait states
Automatic DTACK, 14 wait states
No automatic DTACK, external
DTACK required
MOTOROLA
MC68306 USER'S MANUAL
5-11