ELANsat Tech EM78P156N Network Card User Manual


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EM78P156N
OTP ROM
R-option function is used, it is recommended that P50~P51 are used as output pins. When R-option is in
enable state, P50~P51 must be programmed as input pins. Under R-option mode, the current/power
consumption by Rex should be taken into the consideration to promote energy conservation.
The I/O registers and I/O control registers are both readable and writable. The I/O interface circuits for
Port 5 and Port 6 are shown in the following Figures 6, 7(a), 7(b), and Figure 8.
PCWR
PCRD
PDWR
PDRD
IOD
0
1
M
U
X
PORT
Q
Q
_
D
D
Q
Q
_
CLK
P
R
C
L
CLK
P
R
C
L
NOTE: Pull-down is not shown in the figure.
Fig. 6 The Circuit of I/O Port and I/O Control Register for Port 5
PCRD
IO D
PCWR
PDWR
PDRD
Bit 6 of IOCE
PORT
P60 /INT
T10
INT
M
U
X
0
1
CLK
CLK
CLK
CLK
P
P
P
P
R
R
R
R
C
L
L
L
L
C
C
C
Q
Q
Q
Q
Q
Q
Q
Q
D
D
D
D
_
_
_
_
NOTE: Pull-high (down) and Open-drain are not shown in the figure.
Fig. 7(a) The Circuit of I/O Port and I/O Control Register for P60 (/INT)
This specification is subject to change without prior notice. 17 07.29.2004 (V1.2)
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