sm5351af1 Seiko NPC Corp., sm5351af1 Datasheet - Page 18

• Manufacturer Part Number: sm5351af1
• Description: Audio Video Switch
• Manufacturer: Seiko NPC Corp.

Status Register
SM5351AF1 has a 3-byte status register.
The function of each byte in the status register is described in the following tables.
Register name: VC1, VC2, VC3, VC4
Sub-address: 00h, bit7 to bit4
Returns the connections condition of CVBS input RCA connector.
(It discriminates DC voltage of VC1, VC2, VC3 or VC4 pin. These pins are pulled-up in IC internally.)
Register name: S-1, S-2
Sub-address: 00h, bit3 to bit2
Returns the connections condition of S-video terminal connectors.
(It discriminates DC voltage of S-1 or S-2 pin. These pins are pulled-up in IC internally.)
addr.
sub
00h
01h
02h
Status Register
Status Register
Status Register
Status Register
Status Register
Status Register
sub addr. 00h
sub addr. 00h
sub addr. 00h
sub addr. 00h
sub addr. 00h
sub addr. 00h
VC1
bit7
bit7
bit6
bit5
bit4
bit3
bit2
0
1
0
1
0
1
0
1
0
1
0
1
S2-1
S2-2
VC2
bit6
VC3
bit5
0
D1L1
INPUT pin
INPUT pin
INPUT pin
INPUT pin
INPUT pin
INPUT pin
DC level
DC level
DC level
DC level
DC level
DC level
> 3.2V
< 1.8V
> 3.2V
< 1.8V
> 3.2V
< 1.8V
> 3.2V
< 1.8V
> 3.2V
< 1.8V
> 3.2V
< 1.8V
Register assign
VC4
VC1
VC2
VC3
VC4
bit4
S-1
S-2
0
bit3
S-1
0
D1L2
RCA connector of V1 is disconnected.
RCA connector of V1 is connected.
RCA connector of V2 is disconnected.
RCA connector of V2 is connected.
RCA connector of V3 is disconnected.
RCA connector of V3 is connected.
RCA connector of V4 is disconnected.
RCA connector of V4 is connected.
Connector of S-video terminal 1 is disconnected.
Connector of S-video terminal 1 is connected.
Connector of S-video terminal 2 is disconnected.
Connector of S-video terminal 2 is connected.
bit2
S-2
SM5351AF1
0
D1SW
bit1
0
D1L3
D2SW
bit0
0
Description
Description
Description
Description
Description
Description
Connections condition
S2-1 or D1 discriminate result
S2-2 discriminate result
SEIKO NPC CORPORATION —18
Description