Cypress CY7C67300 Manual De Usuario
CY7C67300
Document #: 38-08015 Rev. *J
Page 6 of 99
External Memory Interface Pins
External Memory Interface Block Diagrams
illustrates how to connect a 64k × 8 memory array
(SRAM/ROM) to the EZ-Host external memory interface.
illustrates the interface for connecting a 16-bit ROM or
16-bit RAM to the EZ-Host external memory interface. In 16-bit
mode, up to 256K words of external ROM or RAM are supported.
Note that the address lines do not map directly.
mode, up to 256K words of external ROM or RAM are supported.
Note that the address lines do not map directly.
Table 6. External Memory Interface Pins
Pin Name
Pin Number
nWR
64
nRD
62
nXMEMSEL (optional nCS)
34
nXROMSEL (ROM nCS)
35
nXRAMSEL (RAM nCS)
36
A18
95
A17
96
A16
97
A15
38
A14
33
A13
32
A12
31
A11
30
A10
27
A9
25
A8
24
A7
20
A6
17
A5
8
A4
7
A3
3
A2
2
A1
1
nBEL/A0
99
nBEH
98
D15
67
D14
68
D13
69
D12
70
D11
71
D10
72
D9
73
D8
74
D7
76
D6
77
D5
78
D4
79
D3
80
D2
81
D1
82
D0
83
Figure 2. Interfacing to 64k × 8 Memory Array
Figure 3. Interfacing up to 256k × 16 for External Code/Data
Table 6. External Memory Interface Pins (continued)
Pin Name
Pin Number
EZ-Host
CY7C67300
External Memory Array
64K x 8
A[15:0]
nWR
nRD
nXRAMSEL
A[15:0]
WE
OE
CE
D[7:0]
D[7:0]
Interfacing to 64K x 8 External Memory Array
EZ-Host
CY7C67300
External Memory Array
Up to 256k x 16
A[18:1]
nBEL
nBEH
nWR
nRD
nXMEMSEL
A[17:0]
BLE
WE
OE
CE
D[15:0]
D[15:0]
Up to 256k x 16 External Code/Data (Page Mode)
BHE