NAD T 751 Service Manual page 30

AC3 BOARD
U104, U109, U116,
U131, U134: NJM5532
AMPLIFIER 1
1
OUTPUT
INVERTING
2
INPUT
– +
NON-INVERTING
3
INPUT
4
V –
AC3 BOARD
U105: CS4926
CMPDAT,
27
SDATAN2
CMPCLK,
28
SCLKN2
CMPREQ,
29
LRCLKN2
SCLKN1,
25
STCCLK2
LRCLKN1
26
22
SDATAN1
30
CLK1N
CLKSEL
31
AC3 BOARD
U106, U107: 74HC574
AMPLIFIER 2
8
V +
7
OUTPUT
+ –
INVERTING
6
INPUT
NON-INVERTING
5
INPUT
DATA7-0,
EMAD7-0,
RESET GPIO7-0
36 8-11,14-17
Compressed
Data Input
Framer
Interface
Shifter
Input
Buffer
Controller
Digital
Audio
Input
RAM Input
Interface
Buffer
PLL
Clock Manager
32 33 34 35
FILT2 FILT1 VA AGND
D0
D Q
CP
FF1
CP
OE
AC3 BOARD
U108: AT27C020-70
V (32)
CC
GND(16)
VPP(1)
OE(24)
CE(22)
PGM(31)
A0-A17
ADDRESS
INPUTS
(2-12, 25-30)
RD, WR, SCDIO,
R/W, DS, SCDOUT,
EMOE, EMWR, PSEL,
CS GPIO11 GPIO10 GPIO9
18 5 4 19
Parallel or Serial Host Interface
24-Bit
DSP Processing
RAM RAM
Program Program
Memory Memory
RAM RAM
Program Program
Memory Memory
STC
2 13 24 1 12 23
DGND[1-3] VD[1-3]
D1 D2 to D5
D Q
CP
FF2
Q0 Q1
40
OE, CE AND
PROGRAM LOGIC
Y DECODER
X DECODER
A0, A1, ABOOT, EXTMEM,
SCCLK SCDIN INTREQ GPIO8
7 6 20
Output
RAM
Formatter
Output
Buffer
D6
D Q
CP
FF7
DATA OUTPUTS
O0-O7
(13-15, 17-21)
OUTPUT
BUFFERS
Y-GATING
CELL MATRIX
IDENTIFICATION
21
37
DD
38
DC
44
MCLK
43
SCLK
42
LRCLK
41
AUDATA0
40
AUDATA1
39 AUDATA2
XMT958
3
D7
D Q
CP
FF8
Q6 Q7