DS10CP154A_14 Datasheet, PDF (10/20 Pages) Texas Instruments – DS10CP154A 1.5 Gbps 4x4 LVDS Crosspoint Switch

DS10CP154A
SNLS306C – AUGUST 2008 – REVISED APRIL 2013
www.ti.com
Reading From a Register
To read a register, the following protocol is used (see SMBus 2.0 specification):
1) The Host drives a START condition, the 7-bit SMBus address, and a “0” indicating a WRITE.
2) The Device (Slave) drives an ACK bit (“0”).
3) The Host drives the 8-bit Register Address.
4) The Device drives an ACK bit (“0”).
5) The Host drives a START condition.
6) The Host drives the 7-bit SMBus Address, and a “1” indicating a READ.
7) The Device drives an ACK bit “0”.
8) The Device drives the 8-bit data value (register contents).
9) The Host drives a NACK bit “1” indicating end of READ transfer.
10) The Host drives a STOP condition.
The READ transaction is completed, the bus goes Idle and communication with other SMBus devices may now
occur.
REGISTER DESCRIPTIONS
There are three data registers in the DS10CP154A accessible via the SMBus interface.
Address
(hex)
0
3
4
Name
Switch Configuration
Control
LOS
Table 6. DS10CP154A SMBus Data Registers
Access
R/W
R/W
RO
Description
Switch Configuration Register
Powerdown, LOS Enable and Pin Control Register
Loss Of Signal (LOS) Reporting Register
SCL
SDA
4
SMBus
Interface
EN_smb
LOS
Register
Switch
Configuration
Register
Control
Register
Switch Configuration Register
The Switch Configuration register is utilized to configure the switch. The following two tables show the Switch
Configuration Register mapping and associated truth table.
Bit
D[1:0]
D[3:2]
D[5:4]
D[7:6]
Default
00
00
00
00
Bit Name
Input Select 0
Input Select 1
Input Select 2
Input Select 3
Access
R/W
R/W
R/W
R/W
Description
Selects which input is routed to the OUT0.
Selects which input is routed to the OUT1.
Selects which input is routed to the OUT2.
Selects which input is routed to the OUT3.
10
Submit Documentation Feedback
Copyright © 2008–2013, Texas Instruments Incorporated
Product Folder Links: DS10CP154A