Samsung ML-920 Service Manual page 136

CIRCUIT DESCRIPTION
No Pin Name
91 nDREQ1/RxD2/CTin[1]
92 nDMACK1 / TxD2
93 nIOCS1 / nIOCS5
94 Vddi
95 nDREQ0 /IP1/CTin[0]
96 nDMACK0 / OP1
97 nIOCS4 / OP2
98 EIRQ0
99 EIRQ1
100 EIRQ2
101 nWait / EIRQ3
102 Vssi
103 VCLK
104 Vddi
105 IP[7] / nFSYNC
106 nLSYNC
107 OP[8] / nPRINT
108 Vssi
109 VDO
110 Vsso
111 CCLK / PWM[0]
112 nEPRDY / RxD0
113 nCBSY / TxD0
114 nEMSG / PWM[1]
115 nEBSY / nLsuReady
116 nCMSG / PWM[2]
117 Vddo
118 nDRAMCAS0
119 nDRAMCAS1
120 nDRAMCAS2
Repair Manual
3-6
I/O Reset Value
I - DMA Request1/Uart 2 RxD
O H DMA Ack1/Uart 2 TxD
O " IO CS1 / DMA IO1 CS
Vdd -
I - DMA Request0 / Input Port
O H
O " DMA IO0 CS / Out Port
I -
I -
I -
I - Wait Request / Ex. IRQ 3
Vss -
I -
Vdd -
I - Input Port / Frame Sync
I -
O H
Vss -
O H
Vss -
O H Com. Clock / PWM [0]
I -
O H
I/O Input Eng. Message / PWM [1]
I - Eng. Busy / LSU Ready
O H Com. Busy / PWM [2]
Vdd -
O L
O "
O "
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Description
3.3 V
DMA Ack1 / Out Port
External Interrupt 0
External Interrupt 1
External Interrupt 2
3.3 V Gnd
Video Clock Input
3.3 V
Line Sync
Out Port / Print Start
3.3 V Gnd
Video Data Output
5 V Gnd
Engine Power Ready
/ Uart 0 Rx Data
Command Busy
/ Uart 0 Tx Data
5 V
DRAM Cas Strobe 0
DRAM Cas Strobe 1
DRAM Cas Strobe 2
PAD
PHIL, ST
PHOB4, 4 mA
"
PHIL, ST
PHOB4, 4 mA
"
PHILU50, ST
"
"
"
PHIC
PHIL, ST
"
PHOB4, 4 mA
PHOB16, 16mA
PHOB4, 4 mA
PHIL, ST
PHOB4, 4 mA
PHBLT4,ST,4mA
PHIL, ST
PHOB4, 4 mA
PHOB8, 8 mA
"
"
Samsung Electronics