BBK 9903S, Service Manual

Page: 26 / 94

MT1379
PRELIMINARY, SUBJECT TO CHANGE WITHOUT NOTICE MTK CONFIDENTIAL, NO DISCLOSURE
Pin Number Symbol Type Description
67 UP1_7 Inout
4MA, SR
PU, SMT
Microcontroller port 1 -7
68 UP3_0 Inout
4MA, SR
PU, SMT
Microcontroller port 3 -0
69 UP3_1 Inout
4MA, SR
PU, SMT
Microcontroller port 3 -1
70 INT0# Inout
2~16MA, SR
PU, SMT
Microcontroller interrupt 0, active low
71 IR Input
SMT
IR control signal input
72 DVDD2 Power 2.5V power pin for internal digital circuitry
73 UP3_4 Inout Microcontroller port 3 -4
74 UP3_5 Inout Microcontroller port 3 -5
75 UWR# Inout
2~16MA, SR
PU, SMT
Microcontroller write strobe, active low
76 URD# Inout
2~16MA, SR
PU, SMT
Microcontroller read strobe, active low
77 DVSS Ground Ground pin for internal digital circuitry
78 RD7 Inout DRAM data 7
79 RD6 Inout DRAM data 6
80 RD5 Inout DRAM data 5
81 RD4 Inout DRAM data 4
82 DVDD2 Power 2.5V power pin for internal digital circuitry
83 RD3 Inout DRAM data 3
84 RD2 Inout DRAM data 2
85 RD1 Inout DRAM data 1
86 RD0 Inout DRAM data 0
87 RWE# Output
2~16MA, SR
DRAM Write enable, active low
88 CAS# Output
2~16MA, SR
DRAM columnaddress strobe, active low
89 RAS# Output
2~16MA, SR
DRAM row address strobe, active low
90 RCS# Output
2~16MA, SR
DRAM chip select, active low
91 BA0 Output
2~16MA, SR
DRAM bank address 0
92 DVSS Ground Ground pin for internal digital circuitry
93 RD15 Inout
2~16MA, SR
PU/PD, SMT
DRAM data 15