Icom IC-FR6100 Service Manual page 14

3-4 CPU (M: IC20) PORT ALLOCATION (continued)
Pin
LINE NAME
No.
123 DAST Strobe to the DAC (M: IC2).
125 FMDA Data from the FRONT CPU (F: IC502).
126 MFDA Data to the FRONT CPU (F: IC502).
127 OPT2 Port for optional unit.
128 OPT1 Port for optional unit.
129 OPT3 Port for optional unit.
131 CSO Port for optional unit.
132 CSI Port for optional unit.
133 EXOE Output enable signal to the seri-para converter (M: IC31).
134 EXST Strobe to the seri-para converter (M: IC31).
135 DRES Reset signal to the DSP IC (M: IC12).
136 HCS DSP data line.
138 GPIO2 DSP data line.
139 GPIO1 DSP data line.
DESCRIPTION
5 - 4
IN/
CONDITION
OUT
O –
I –
O –
O –
I –
I –
O –
I –
O –
O –
O –
I/O –
I/O –
I/O –