Yamaha HTR-6150 Service Manual page 51

• Microprocessor extended port
IC57-IC59: SN74LV574APWR (DSP P.C.B.)
Octal edge-triggered D-type flip-flops with 3-state outputs
IC57
Pin No. Port Name
1 /OE
2 1D
3 2D
4 3D
5 4D
6 5D
7 6D
8 7D
9 8D
10 GND
11 LCK
12 8Q
13 7Q
14 6Q
15 5Q
16 4Q
17 3Q
18 2Q
19 1Q
20 VCC
IC58
Port Name
Pin No.
1 /OE
2 1D
3 2D
4 3D
5 4D
6 5D
7 6D
8 7D
9 8D
10 GND
11 CLK
12 8Q
13 7Q
14 6Q
15 5Q
16 4Q
17 3Q
18 2Q
19 1Q
20 VCC
1
OE
11
CLK
C1
2
1D
1D
C8
9
8D
8D
Function Name
/EXPE Extended port enable
D00 Data bus 00
D01 Data bus 01
D02 Data bus 02
D03 Data bus 03
D04 Data bus 04
D05 Data bus 05
D06 Data bus 06
D07 Data bus 07
DGND Ground of external
NPGA_EXSTB Bank select 1
– –
R2A_CLK E-Vol control clock
R2A_DATA E-Vol control data
VIDEO_MTVR1 DVR REC output inhibit
/DAC_CS DA converter chip select
/ADC_CS AD converter chip select
/VFD_CS VFD (Front display) chip select
/DIR_CS Audio CODEC chip select
VCC Power supply +3.3V
Function Name
/EXPE Extended port enable
D00 Data bus 00
D01 Data bus 01
D02 Data bus 02
D03 Data bus 03
D04 Data bus 04
D05 Data bus 05
D06 Data bus 06
D07 Data bus 07
DGND Ground of external
NPGA_EXSTB Bank select 1
PRY Power relay control
XM_POWER XM power enable
/Z2MT Zone2 L/R mute
/SBMT Surround back L/R mute
/SWMT Subwoofer mute
/CMT Center mute
/SMT Surround L/R mute
/FMT Front L/R mute
VCC Power supply +3.3V
RX-V563/HTR-6150/DSP-AX563
OE 1 20 V
CC
1D 2 19
1Q
2D 3 18
2Q
19
4 17
3D
1Q
3Q
4D 5 16
4Q
5D 6 15
5Q
6D 7 14
6Q
8 13
7D 7Q
8D 9 12 8Q
12
GND 10 11 CLK
8Q
Detail of Function
Detail of Function
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