CY7C67300
Document #: 38-08015 Rev. *J Page 6 of 99
External Memory Interface Pins
External Memory Interface Block Diagrams
Figure2 illustrates how to connect a 64k × 8 memory arra y
(SRAM/ROM) to the EZ-Host external memory interface.
Figure3 illustrates the interface for conn ecting 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.
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
[+] Feedback