CY7C67300
Document #: 38-08015 Rev. *J
Page 80 of 99
71
D11/MOSI
IO
D11:
External Memory Data Bus
MOSI:
SPI MOSI
72
D10/SCK
IO
D10:
External Memory Data Bus
SCK:
SPI SCK
73
D9/nSSI
IO
D9:
External Memory Data Bus
nSSI:
SPI nSSI
74
D8/MISO
IO
D8:
External Memory Data Bus
MISO:
SPI MISO
76
D7
IO
External Memory Data Bus
77
D6
IO
78
D5
IO
79
D4
IO
80
D3
IO
81
D2
IO
82
D1
IO
83
D0
IO
33
A14
Output
External Memory Address Bus
32
A13
Output
31
A12
Output
30
A11
Output
27
A10
Output
25
A9
Output
24
A8
Output
20
A7
Output
17
A6
Output
8
A5
Output
7
A4
Output
3
A3
Output
2
A2
Output
1
A1
Output
99
nBEL/A0
Output
nBEL:
Low Byte Enable for 16-bit memories
A0:
External Memory Address bit A0 for 0-8 bit memories
98
nBEH
Output
High Byte Enable for 16-bit memories
64
nWR
Output
External Memory Write pulse
62
nRD
Output
External Memory Read pulse
97
A16
Output
A16:
External SRAM A16
96
A17
Output
A17:
External SRAM A17
95
A18
Output
A18:
External SRAM A18
34
nXMEMSEL
Output
External Memory Select 0
35
nXROMSEL
Output
External Memory Select 1
36
nXRAMSEL
Output
External Memory Select 2
38
A15/CLKSEL
IO
A15:
External SRAM A15
CLKSEL:
Sampled directly after reset to determine what crystal or
clock source frequency is being used. 12 MHz is required for normal
operation so the CLKSEL pin
must
have a 47K ohm pull up to V
CC.
After reset this pin functions as A15.
39
GPIO31/SCK
IO
GPIO31:
General Purpose IO
SCK:
I2C EEPROM SCK
40
GPIO30/SDA
IO
GPIO30:
General Purpose IO
SDA:
I2C EEPROM SDA
Table 131. Pin Descriptions
(continued)
Pin
Name
Type
Description
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