Digi NS7520B-1-C36 Hardware Reference Manual page 26

P i n o u t d e t a i l t a b l e s a n d s i g n a l d e s c r i p t i o n s
Symbol
DATA11
DATA10
DATA9
DATA8
DATA7
DATA6
DATA5
DATA4
DATA3
DATA2
DATA1
DATA0
BE3_
BE2_
BE1_
BE0_
TS_
TA_
TEA_
RW_
BR_
Table 2: System bus interface pinout
1 4
Pin
F4
F2
F3
E1
E2
E3
D1
C1
B1
D4
D3
C2
D9
A9
C9
B9
A8 U
D8 U
C8 U
D6
D7
N S 7 5 2 0 H a r d w a r e R e f e r e n c e , R e v G 9 / 2 0 0 7
I/O OD Description
I/O 4
I/O 4
I/O 4
I/O 4
I/O 4
I/O 4
I/O 4
I/O 4
I/O 4
I/O 4
I/O 4
I/O 4
I/O 2 Byte enable D31:D24
I/O 2 Byte enable D23:D16
I/O 2 Byte enable D15:D08
I/O 2 Byte enable D07:D00
I/O 4 DO NOT USE
Add an external 820 ohm pullup to 3.3 V.
I/O 4 Data transfer acknowledge
Add an external 820 ohm pullup to 3.3 V.
TA_ is bidirectional. It is used in input mode to
terminate a memory cycle externally. It is used in
output mode for reference purposes only.
I/O 4 Data transfer error acknowledge
Add an external 820 ohm pullup to 3.3 V.
TEA_ is bidirectional. It is used in input mode to
terminate a memory cycle externally. It is used in
output mode for reference purposes only.
I/O 2 Transfer direction
NO CONNECT