MC68306 Motorola, MC68306 Datasheet - Page 106

• Manufacturer Part Number: MC68306
• Description: Integrated EC000 Processor
• Manufacturer: Motorola

x = Address bit is a don’t care, DRA bit must be 0 to allow match.
• = Address bit must match DRA bit for DRAM bank to occur.
DRSZ—DRAM Size
DRDT—DRAM Automatic DTACK Response
5-16
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
DRAM address multiplexer provides (8 + DRSZ2–0) CAS address bits.
0 = Automatic DTACK, 0 wait states
1 = Automatic DTACK, 1 wait state
A31
x
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
A30
Both DRAM banks must be the same size and speed. The
DRAM logic uses the DRSZ and DRDT values programmed in
the bank 0 configuration register only. These bits in the bank 1
configuration register are ignored.
The write portion of a TAS is always 0-wait, regardless of the
state of DRDT.
x
x
•
•
•
•
•
•
•
•
•
•
•
•
•
•
A29
x
x
x
•
•
•
•
•
•
•
•
•
•
•
•
•
A28
x
x
x
x
•
•
•
•
•
•
•
•
•
•
•
•
Table 5-4. DRAM Bank Match Bits
A27
x
x
x
x
x
•
•
•
•
•
•
•
•
•
•
•
MC68306 USER'S MANUAL
A26
x
x
x
x
x
x
•
•
•
•
•
•
•
•
•
•
A25
NOTE
NOTE
x
x
x
x
x
x
x
•
•
•
•
•
•
•
•
•
A24
x
x
x
x
x
x
x
x
•
•
•
•
•
•
•
•
A23
x
x
x
x
x
x
x
x
x
•
•
•
•
•
•
•
A22
x
x
x
x
x
x
x
x
x
x
•
•
•
•
•
•
A21
x
x
x
x
x
x
x
x
x
x
x
•
•
•
•
•
A20
x
x
x
x
x
x
x
x
x
x
x
x
•
•
•
•
A19
x
x
x
x
x
x
x
x
x
x
x
x
x
•
•
•
MOTOROLA
A18
x
x
x
x
x
x
x
x
x
x
x
x
x
x
•
•
A17
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
•