MC68306 Motorola, MC68306 Datasheet - Page 100

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

CSW—Chip Select Write
5.2.6.2 CHIP SELECT CONFIGURATION REGISTERS (LOW HALF)
FFFFFFC2 (CS0)
FFFFFFDE (CS7), FFFFFFDA (CS6), FFFFFFD6 (CS5), FFFFFFD2 (CS4), FFFFFFCE (CS3), FFFFFFCA (CS2),
FFFFFFC6 (CS1)
CSR—Chip Select Read
CSFC 6, 5, 2, 1—Chip Select Function Code Enable
CSM3–0—Chip Select Address Match
5-10
RESE
RESE
CSR
CSR
15
T:
15
T:
U
This bit determines whether write cycles are permitted to chip select space. If read and
write cycles are both inhibited, chip select is inhibited.
0
This bit determines whether read cycles are permitted to chip select space. If read and
write cycles are both inhibited, chip select is inhibited.
This bit determines which function code accesses are permitted to chip select space. If
all function code cycles are inhibited, chip select is inhibited.
This field determines which chip select bits must match address bits for chip select to
occur. CSA bits not included in match must be set to zero, or else this chip select is
inhibited.
0 = Write cycles are inhibited to chip select space
1 = Write cycles are permitted to chip select space
0 = Read cycles are inhibited to chip select space
1 = Read cycles are permitted to chip select space
0 = Function code ‘n’ cycles are inhibited to chip select space
1 = Function code ‘n’ cycles are permitted to chip select space
0000 = A31–A17 ignored in chip select address match
0001 = A31 must match CSA31; A30–A17 ignored in chip select address match
0010 = A31–A30 must match CSA31–CSA30; A29–A17 ignored in chip select
CSFC
CSFC
14
14
6
1
6
U
CSFC
CSFC
13
13
5
1
5
U
address match
12
12
—
—
1
U
11
11
—
—
1
U
CSFC
CSFC
10
10
2
1
2
U
MC68306 USER'S MANUAL
CSFC
CSFC
9
1
1
9
1
U
—
—
8
1
8
U
CSM3
CSM3
7
0
7
U
CSM2
CSM2
U
6
0
6
CSM1
CSM1
5
0
5
U
CSM0
CSM0
4
0
4
U
CSDT3
CSDT3
3
1
3
U
CSDT2
CSDT2
2
1
2
U
SUPERVISOR ONLY
SUPERVISOR ONLY
MOTOROLA
CSDT
CSDT
U
1
1
1
1
1
CSDT
CSDT
U
0
0
0
0
0