DS16EV5110SQ Datasheet, PDF (8/24 Pages) Texas Instruments – DS16EV5110 Video Equalizer (3D+C) for DVI, HDMI Sink-Side Applications

DS16EV5110
SNLS249M – FEBRUARY 2007 – REVISED APRIL 2013
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SYSTEM MANAGEMENT BUS (SMBUS) AND CONFIGURATION REGISTERS
The System Management Bus interface is compatible to SMBus 2.0 physical layer specification. The use of the
Chip Select signal is required. Holding the CS pin High enables the SMBus port allowing access to the
configuration registers. Holding the CS pin Low disables the device's SMBus allowing communication from the
host to other slave devices on the bus. In the STANDBY state, the System Management Bus remains active.
When communication to other devices on the SMBus is active, the CS signal for the DS16EV5110s must be
driven Low.
The address byte for all DS16EV5110s is AC'h. Based on the SMBus 2.0 specification, the DS16EV5110 has a
7-bit slave address of 1010110'b. The LSB is set to 0'b (for a WRITE), thus the 8-bit value is 1010 1100 'b or
AC'h.
The SDC and SDA pins are 3.3V LVCMOS signaling and include high-Z internal pull up resistors. External low
impedance pull up resistors maybe required depending upon SMBus loading and speed. Note, these pins are not
5V tolerant.
Transfer of Data via the SMBus
During normal operation the data on SDA must be stable during the time when SDC is High.
There are three unique states for the SMBus:
START: A High-to-Low transition on SDA while SDC is High indicates a message START condition.
STOP: A Low-to-High transition on SDA while SDC is High indicates a message STOP condition.
IDLE: If SDC and SDA are both High for a time exceeding t_BUF from the last detected STOP condition or if they
are High for a total exceeding the maximum specification for t_HIGH then the bus will transfer to the IDLE state.
SMBus Transactions
The device supports WRITE and READ transactions. See Register Description table for register address, type
(Read/Write, Read Only), default value and function information.
Writing a Register
To write a register, the following protocol is used (see SMBus 2.0 specification).
1. The Host (Master) selects the device by driving its SMBus Chip Select (CS) signal High.
2. The Host drives a START condition, the 7-bit SMBus address, and a “0” indicating a WRITE.
3. The Device (Slave) drives the ACK bit (“0”).
4. The Host drives the 8-bit Register Address.
5. The Device drives an ACK bit (“0”).
6. The Host drive the 8-bit data byte.
7. The Device drives an ACK bit (“0”).
8. The Host drives a STOP condition.
9. The Host de-selects the device by driving its SMBus CS signal Low.
The WRITE transaction is completed, the bus goes IDLE and communication with other SMBus devices may
now occur.
Reading a Register
To read a register, the following protocol is used (see SMBus 2.0 specification).
1. The Host (Master) selects the device by driving its SMBus Chip Select (CS) signal High.
2. The Host drives a START condition, the 7-bit SMBus address, and a “0” indicating a WRITE.
3. The Device (Slave) drives the ACK bit (“0”).
4. The Host drives the 8-bit Register Address.
5. The Device drives an ACK bit (“0”).
6. The Host drives a START condition.
7. The Host drives the 7-bit SMBus Address, and a “1” indicating a READ.
8. The Device drives an ACK bit “0”.
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