Texas Instruments TMS320C3x 사용자 설명서
32-Bit-Wide Memory Interface
10-24
Case 3: 32-Bit-Wide Memory With 32-Bit Data-Type Size
When the data size is 32 bits, the ’C32 does not shift the internal address
before presenting it to the external address pins. In this case, the memory
interface copies the value of the internal address bus to the respective external-
address pins. Also, the memory interface activates STRBx_B3 through
STRBx_B0 pins during accesses. Figure 10–13 shows a functional diagram
of the memory interface for 32-bit-wide memory with 32-bit data size.
before presenting it to the external address pins. In this case, the memory
interface copies the value of the internal address bus to the respective external-
address pins. Also, the memory interface activates STRBx_B3 through
STRBx_B0 pins during accesses. Figure 10–13 shows a functional diagram
of the memory interface for 32-bit-wide memory with 32-bit data size.
Figure 10–13. Functional Diagram for 32-Bit Data Size and 32-Bit External-Memory Width
A23
A22
A21
A20
.
.
.
A2
A1
A0
CS
A22
A21
A20
.
.
.
A2
A1
A0
CS
I/O(7-0)
’C32
A23
A22
A21
A20
.
.
.
.
.
A2
A1
A0
D(31-24)
D(23-16)
D(23-16)
D(15-8)
D(7-0)
Memory interface
A23
A22
A21
A20
.
.
.
A2
A1
A0
CS
A22
A21
A20
.
.
.
A2
A1
A0
CS
I/O(7-0)
A23
A22
A21
A20
.
.
.
A2
A1
A0
CS
A22
A21
A20
.
.
.
A2
A1
A0
CS
I/O(7-0)
A23
A22
A21
A20
.
.
.
A2
A1
A0
CS
A22
A21
A20
.
.
.
A2
A1
A0
CS
I/O(7-0)
STRBx logic
ÎÎÎÎ
ÎÎÎÎ
STRBx_B3
ÎÎÎÎ
STRBx_B2
ÎÎÎÎ
ÎÎÎÎ
STRBx_B1
ÎÎÎÎ
STRBx_B0
ÎÎ
ÎÎ
A23
ÎÎ
A22
ÎÎ
ÎÎ
A21
ÎÎ
ÎÎ
A20
Î
.
Î
Î
.
Î
.
ÎÎ
ÎÎ
A2
ÎÎ
ÎÎ
A1
ÎÎ
A0
’C32’
s core address bus