Computer Hardware User's Guide

8-Bit-Wide Memory Interface
10-33 TMS320C32 Enhanced External Memory Interface
Figure 10–19. Functional Diagram for 8-Bit Data-Type Size and 8-Bit External-Memory
Width
A23
A22
A21
A20
.
.
.
A2
CS
I/O(7-0)
’C32
A
23
A
22
A
21
A
20
A
19
A
18
.
.
.
A
0
STRBx_B3/A
–1
STRBx_B2/A
–2
STRBx_B0
D(7-0)
A
23
A
22
A
21
A
20
.
.
.
A
2
A
1
A
0
Memoryinterface
’C32’s core address bus
STRBx
logic
A0
A1
For example, reading or writing to memory locations A04000h to A04004h
involves the pins listed in Table 10–14.
Table 10–14. Example of 8-Bit-Wide Memory With 8-Bit Data-Type Size
Internal
Address Bus
External
Address Pins
STRB0_B3/A
–1
STRB0_B3/A
–2
Active Strobe
Byte Enable
Accessed
Data Pins
A04000h E81000h 0 0 STRB1_B0 D
7–0
A04001h E81000h 0 1 STRB1_B0 D
7–0
A04002h E81000h 1 0 STRB1_B0 D
7–0
A04003h E81000h 1 1 STRB1_B0 D
7–0
A04004h E81001h 0 0 STRB1_B0 D
7–0