ACLK

MULTIFUNCTION

I/O PORT BIT

ACLK

RD/WR

ANC/CTRL

AD[9:0]

WRITE

DATA

DATA

DATA

DATA

DATA

DATA

DATA

LMH0030

SNLS219G – JANUARY 2006 – REVISED APRIL 2013

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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

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