SM5921A
8-channel Lip Sync Delay
OVERVIEW
The SM5921A is an SDRAM controller LSI for audio applications. It stores 64-fs slot 3-wire serial format
audio data input at sampling frequency fs in SDRAM, and can access data at an arbitrary address to add a delay
to each channel data. It also has a direct mute function to mute the audio data.
FEATURES
Functions
I
PINOUT
(Top view)
CASN
RASN
WEN
CSN
VDD
33
I
I
I
I
I
I
I
I
System clock input
64fs (fs = 32 to 192kHz) bit clock
Sampling frequency: fs = 32 to 192kHz support
Data input/output
3-wire serial, 8-channel PCM
64 clock/slot, word clock polarity inversion
Direct mute function
MCU interface: 3-wire serial
Delay settings: sum of intrinsic delay and individ-
ual delay
• Intrinsic delay (common to all channels,
default = 0 samples, 16-sample units)
• Individual delay (independent for each channel,
default = 0 samples, 1-sample units)
Maximum delay values
1365.3ms @ fs = 48kHz
682.7ms @ fs = 96kHz
341.3ms @ fs = 192kHz
Address shift function:
×
1,
×
2,
×
4 support
Delay time can be multiplied between
×
1,
×
2, or
×
4 times without changing the delay set value.
SDRAM interface: 16M/64M/128M (
×
16 devices
supported)
Package: 64-pin QFP
DQ4
DQ5
DQ6
DQ7
VSS
A10
BA
A0
A1
A2
35
48
47
46
45
44
43
42
41
40
39
38
37
36
34
A3
VDD
DQ3
DQ2
DQ1
DQ0
DQ15
DQ14
DQ13
DQ12
DQ11
DQ10
DQ9
DQ8
WPOLN
OEN
VSS
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
VSS
DQM
CLKO
CKE
A9
A8
A7
A6
A5
A4
DOD
DOC
DOB
DOA
TEST
VDD
TEST3
13
DMUTEN
14
RSTN
15
PACKAGE DIMENSIONS
(Unit: mm)
Weight: 0.35g
12 ± 0.4
10 ± 0.1
+0
0.125
−
0 .075
.025
Structure
I
Silicon-gate CMOS
Applications
10 ± 0.1
I
Audio delay for multi-channel PCM signals
12 ± 0.4
TEST2
12
BCKI
SCLK
WCKI
VDD
XCS
ORDERING INFORMATION
Device
SM5921AF
Package
64-pin QFP
1.4 ± 0.1
0.08
S
+ 0.09
0.18
−
0.05
0.1
0 to 10
S
Note. Dimensions without tolerance are reference values.
SEIKO NPC CORPORATION —1
1.7 MAX
0.5
0.5 ± 0.2
VSS
16
SI
10
DIC
DID
SIO
11
1
2
3
4
5
6
7
8
DIA
DIB
9
NPC [ NIPPON PRECISION CIRCUITS INC ]
