Yamaha AV-S77 Service Manual page 21

IC4 : YSS918D-F
AC3Dav
No. Name I/O
53 CRC O AC-3 CRC error detect terminal
54 MUTE O Auto mute detect terminal
55 KARAOKE O AC-3 KARAOKE data detect terminal
56 SURENC O AC-3 2/0 mode Dolby surround encode input detect terminal
57 /SDBCK0 O SDBCK0 invert clock output terminal
58 RAMA6 O External SRAM address terminal 6
59 RAMA5 O External SRAM address terminal 5
60 VSS Ground terminal (for internal circuit)
61 RAMA4 O External SRAM address terminal 4
62 /IC Ics Initial clear terminal
63 TEST Test terminal (unconnected)
64 RAMA3 O External SRAM address terminal 3
65 /CSB Itsp Sub DSP chip select input terminal
66 /CS Its Microprocessor interface chip select input terminal
67 SO O* Microprocessor interface data output terminal
68 SI Its Microprocessor interface and Sub DSP data input terminal
69 SCK Its Microprocessor interface and Sub DSP clock input terminal
70 RAMA2 O
71 VDD1 +5V power terminal (for terminal section)
72 RAMD0 Itp/O External SRAM data terminal (STREAM 0 output when external SRAM is not used)
73 RAMD1 Itp/O External SRAM data terminal (STREAM 1 output when external SRAM is not used)
74 RAMD2 Itp/O External SRAM data terminal (STREAM 2 output when external SRAM is not used)
75 RAMD3 Itp/O External SRAM data terminal (STREAM 3 output when external SRAM is not used)
76 RAMD4 Itp/O External SRAM data terminal (STREAM 4 output when external SRAM is not used)
77 RAMD5 Itp/O External SRAM data terminal (STREAM 5 output when external SRAM is not used)
78 RAMD6 Itp/O External SRAM data terminal (STREAM 6 output when external SRAM is not used)
79 RAMD7 Itp/O External SRAM data terminal (STREAM 7 output when external SRAM is not used)
80 VSS Ground terminal (for terminal section)
81 VDD2 +3.3V power terminal (for internal circuit)
82 SDWCK0 It Word clock input terminal for SDIA, SDOA, SDIB and SDOB signals
83 SDBCK0 It Bit clock input terminal for SDIA, SDOA, SDIB and SDOB signals
84 SDIA0 It AC-3/DTS bit stream (or PCM) data input terminal to Main DSP
85 SDIA1 It AC-3/DTS bit stream (or PCM) data input terminal to Main DSP
86 RAMA1 O External SRAM address terminal 1
87 RAMA0 O External SRAM address terminal 0
88 RAMWEN O External SRAM write enable terminal
89 RAMOEN O External SRAM output enable terminal
90 VSS Ground terminal
91 VDD2 +3.3V power terminal (for internal circuit)
92 IPORT7 Itp General purpose input terminal (Used for IC YSS908/918 identification: +3.3V)
93 IPORT6 Itp General purpose input terminal (GND)
94 IPORT5 Itp General purpose input terminal (GND)
95 IPORT4 Itp General purpose input terminal (GND)
96 IPORT3 Itp General purpose input terminal (GND)
97 IPORT2 Itp General purpose input terminal (GND)
98 IPORT1 Itp General purpose input terminal (GND)
99 IPORT0 Itp General purpose input terminal (GND)
100 VSS Ground terminal
Note) Listed below are symbols in the I/O column and their meanings.
Ic: CMOS level input terminal
Is: Schmidt trigger input terminal
O: Digital output terminal
A: Analog input terminal
External SRAM address terminal 2
It: TTL level input terminal
Ip: Input terminal with pull-up resistor
O*: Tri-state digital output terminal
Function
AV-S77
20