TEAC AG-D8900 Repair Manual

Dolby Digital/Pro Logic DTS DECODER (YSS912C:INPUT IC43)
PIN No.SYMBOLI/ODESCRIPTION
1,31,71VDD1-+5V Power Supply(for I/Os)
2RAMCENOExternal SRAM interface /CE
3RAMA16OExternal SRAM interface address 16
4RAMA15OExternal SRAM interface address 15
5SDIB0I+PCM input 0 to Sub DSP(not use)
6SDIB1I+PCM input 1 to Sub DSP(not use)
7SDIB2I+PCM input 2 to Sub DSP(not use)
8XII+
9XOOCrystal oscillator connection(12.288MHz)
10, 30VSS-Ground
11AVDD-+3.3V power supply (for PLL circuit)
12SDIB3I+PCM input 3 to Sub DSP(not use)
13TEST-Test terminal(to be open in normal use)
14TEST-Test terminal(to be open in normal use)
15OVFBODetection of overflow at Sub DSP (not use)
16DTSDATAODetection of DTS data (not use)
17AC3DATAODetection of AC-3 data (not use)
18SDOB3OPCM output from Sub DSP
19CPOAOutput terminal for PLL,to be connected to ground through the external analog filter circuit
20AVSS-Ground for PLL circuit)
21,41,51,81,91VDD2-+3.3V power supply (for core logic)
22SDOA2OPCM output from Main DSP (C,LFE)
23SDOA1OPCM output from Main DSP (LS,RS)
24SDOA0OPCM output from Main DSP (L,R)
25 ~ 29RAMA 14~10OExternal SRAM interface address 14~10
32 ~ 35OPORT 0~3OOutput port for general purpose
36 ~ 39OPORT 4~7OOutput port for general purpose (not use)
40,50,60,80,90,100VSS-Ground
42 ~ 44RAAM 9~7OExternal SRAM interface address 9~7
45 ~ 47SDOB 2~0OPCM output from Sub DSP
48SDBCK1I+Bit clock input for SDOA,SDIB,SDOB (not use)
49SDWCK1I+Word clock input for SDOA,SDIB,SDOB (not use)
52NONPCMODetection of non-PCM data (not use)
53CRCODetection of AC-3 CRC error (not use)
54MUTEODetection of auto mute (not use)
55KARAOKEODetection of AC-3 karaoke data (not use)
56SURENCODetection of AC-3 2/0 mode Dolby surround encoded input (not use)
57/SDBCK 0OInverted SDBCK0 clock output (refer to Block diagram)
58RAMA6OExternal SRAM interface address 6
59RAMA5OExternal SRAM interface address 5
61RAMA4OExternal SRAM interface address 4
62/ICIsInitial clear
63TEST-Test terminal (to be ofen in normal use)
64RAMA3OExternal SRAM interface address 3
65/CSBIs+Sub DSP Chip select
66/CSIsMicroprocessor interface Chip select input
67SOOtMicroprocessor interface serial data output
68SIIsMicroprocessor interface /Sub DSP Serial data input
69SCKIsMicroprocessor interface /Sub DSP clock input
12