Datasheet

ACLK
MULTIFUNCTION
I/O PORT BIT
ACLK
RD/WR
ANC/CTRL
AD[9:0]
WRITE
DATA DATA DATADATADATA DATA DATA
LMH0030
SNLS219G –JANUARY 2006–REVISED APRIL 2013 www.ti.com
Figure 4. Ancillary Data Write Timing
MULTI-FUNCTION I/O PORT
The Multi-function I/O port can be configured to provide immediate access to many control and indicator
functions within the LMH0030 configuration and control registers. The individual pins comprising this port may be
assigned as input or output for selected bits in the control data registers. The multi-function I/O port is configured
by way of an 8x6-bit register bank, I/O pin 0 CONFIG through I/O pin 7 CONFIG. The pin configuration registers
contain codes which assign a control register bit to a particular I/O pin. Controls and indicators that are
accessible by the port and their corresponding selection addresses are given in the I/O Pin Configuration
Register Addresses, Table 6. Table 2 gives the control register bit assignments.
CAUTION
When writing data into the control registers via the multi-function I/O port, ACLK must
be toggled to register the data as shown in Figure 5. It is not necessary to toggle
ACLK when reading data from the multi-function I/O port.
Example: Program multi-function I/O port bit-0 as the SAV bit output.
1. Set ANC/CTRL to a logic-low.
2. Set RD/WR to a logic-low.
3. Present 00Fh to AD[9:0] as the I/O PIN 0 CONFIG register address (see Table 3).
4. Toggle ACLK.
5. Present 30Dh to AD[9:0] as the register data (see Table 6).
6. Toggle ACLK.
Figure 5. I/O Port Data Write Timing
14 Submit Documentation Feedback Copyright © 2006–2013, Texas Instruments Incorporated
Product Folder Links: LMH0030