— 26 —
No. Pin Name Io/Out Function To/From
119 CASHHB / CAS2HB O D31-D24 / D15-D8 select signal BGA288,ROM Board
120 CASHLB / CAS2LB O D23-D16 / D7-D0 select signal BGA288,ROM Board
121 Vss GND
122 Vcc +3.3V source
123 WE1B O D15-D8 select signal BGA288
124 WE0B O D7-D0 select signal BGA288,LCD uint,ROM Board
125 CASLHB O D15-D8 select signal BGA288,ROM Board
126 CASLLB / OEB O D7-D0 select / memory select signal BGA288,ROM Board
127 Vss GND
128 Vcc +3.3V source
129 RASB / CEB O CE signal for RAM,ROM BGA288,RAM,ROM Board
130 MD5 / RAS2B Not used
131 HSTBYB I Not used +3.3V source
132 WAITB I Hardware wait request BGA288
133 Vss GND
134 RTCCLK O RTC clock output BGA288
135 Vcc(RTC) +3.3V source(for internal RTC)
136 XTAL2 O Oscillator terminal(for internal RTC) C6
137 EXTAL2 I Oscillator terminal(for internal RTC) C6
138 Vss(RTC) GND(for internal RTC)
139 Vcc +3.3V source
140 D31 I/O Data bus
141 D30 I/O Data bus
142 D29 I/O Data bus
143 D28 I/O Data bus
144 Vss GND
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