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Yamaha A-S501 Service Manual page 34

Integrated amplifier
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A-S501/A-S301
Pin
Function Name
Port Name
No.
(P.C.B.)
1
P9_6/ANEX1/SOUT4
HP_DET
2
P9_5/ANEX0/CLK4
TRIG
3
P9_4/DA1/TB4IN
MPLED
4
P9_3/DA0/TB3IN
EXT_N_RST
5
P9_2/TB2IN/SOUT3
EXT_MOSI
6
P9_1/TB1IN/SIN3
EXT_N_CE
7
P9_0/TB0IN/CLK3
EXT_SCK
8
BYTE
BYTE
9
CNVss
CNVSS
10
P8_7/XCIN
DAC_STATUS
11
P8_6/XCOUT
ZPLED
12
RESET
N_RST
13
Xout
XOUT
1
4
V
s s
V
S
S
1
5
X
n i
X
N I
16
Vcc1
VCC
17
P8_5/NMI/SD
NMI
* Nch Open Drain
18
P8_4/INT2/ZP
KEY1_N_INT
19
P8_3/INT1
MPSW
20
P8_2/INT0
REM
21
P8_1/TA4IN/U/CTS5/
DIR_N_RST
RTS5
22
P8_0/TA4OUT/U//RXD5/
DIR_MISO
SCL5
23
P7_7/TA3IN/CLK5
DIR_SCL
24
P7_6/TA3OUT/TXD5/
DIR_MOSI
SDA5
25
P7_5/TA2IN/W
DIR_N_INT
26
P7_4/TA2OUT/W
FW_DATA
27
P7_3/CTS2/RTS2/TA1IN/
FW_WCL
V
28
P7_2/CLK2/TA1OUT/V
DIR_N_CS
29
P7_1/RXD2/SCL2/TA0IN/
TU_SCL
TB5IN
* Nch Open Drain
30
P7_0/TXD2/SDA2/
TU_SDA
TA0OUT
* Nch Open Drain
31
P6_7/TXD1/SDA1
TXDF
32
P6_6/RXD1/SCL1
RXDF
33
P6_5/CLK1
CLKF
34
P6_4/CTS1/RTS1/CTS0/
BSY
CLKS1
35
P6_3/TXD0/SDA0
DAC_SDA
36
P6_2/RXD0/SCL0
DAC_SCL
37
P6_1/CLK0
DAC_N_RST
38
P6_0/CTS0/RTS0
MI_SEL
39
P5_7/RDY/CLKOUT
Z2VOL_DATA
40
P5_6/ALE
Z2VOL_CLK
41
P5_5/HOLD
N_EPM
42
P5_4/HLDA
SPBRY
43
P5_3/BCLK
SPARY
44
P5_2/RD
HPRY
45
P5_1/WRH/BHE
USB_N_OCPRT
46
P5_0/WRL/WR
N_CE
47
P4_7/TXD7/SDA7/
EEP_SDA
/CS3
48
P4_6/RXD7/SCL7/
EEP_SCL
CS2
49
P4_5/CLK7/CS1
EVOL_DATA
50
P4_4/CTS7/RTS7/CS0
EVOL_CLK
34
I/O
I
I
I
Headphone detection terminal
O
O
O
CONTROL +12V control
O
O
O
LED control for MAIN POWER ON display
O
O
O
EXT IC reset signal
SO
O
O
EXT IC serial data
O
O
O
EXT IC chip select
SO
O
O
EXT IC serial clock
MCU
MCU
MCU Connect to Vss when in the single chip mode (External data bus width change: 16 bit)
MCU
MCU
MCU Low: processor mode select: single chip mode
Hi: To the FLASH included boot mode
O
O
O
PCM-DSD change selector
O
O
O
LED control for ZONE2 POWER ON display
MCU
MCU
MCU Reset input
MCU
MCU
MCU Main clock 20MHz output
M
C
U
M
C
U
M
C
U
M
C
U
M
C
U
M
C
U
M
a
n i
c
o l
k c
2
0
M
H
z
MCU
MCU
MCU
MCU
MCU
MCU Unused, Pull Up
IRQ
IRQ
I
Tuner operation SW/ZONE2 POWER SW detection interrupt input Read KEY1 voltage by this interrupt
MAIN POWER SW detection input
I
I
I
IRQ
IRQ
IRQ
Remote control pulse detection interrupt input
O
O
O
DIR reset terminal
SI
O
O
Reception data from DIR
O
O
O
DIR communication clock
Transmission data for DIR
SO
O
O
I
O
O
Error output from DIR
I
O
O
CD/DA firmware update data via SPDIF
I
O
O
CD/DA firmware update word clock via SPDIF
O
O
O
CS signal of DIR
SO
I
I
TUNER I2C communication bus clock
SO
I
I
TUNER I2C communication bus data
SO
SO
O
For easy emulation
For writing FLASH (Rx)
SI
SI
O
For easy emulation
For writing FLASH (Tx)
SO
SO
O
For easy emulation
For writing FLASH (Clock)
O
O
O
For easy emulation
BUSY signal output for writing FLASH
DAC control data
SIO
I
I
SO
I
I
DAC control serial clock
O
O
O
DAC reset terminal
O
O
O
Analog SW IC output change signal
SIO
I
I
ZONE2 electronic VOLUME control serial daga
SO
O
O
ZONE2 electronic VOLUME control serial clock
I
-
-
For writing FLASH (Low)
O
O
O
Speaker B relay control
O
O
O
Speaker A relay control
O
O
O
Headphone relay control
I
I
I
USB over current detection terminal
I
-
-
For writing FLASH (Hi)
SIO
I
I
EEPROM I2C communication bus data
SO
I
I
EEPROM I2C communication bus clock
SO
O
O
Electronic VOLUME control serial data
SO
O
O
Electronic VOLUME control serial clock
Detail of Function
n i
p
ut
Pull it down as it may fall in the Hiz state while the emulator is working

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