Texas Instruments Incorporated

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GC1012B 3.3V DIGITAL TUNER

SLWS138B

This document contains information which may be changed at any time without notice

3.7

ONE SHOT ADDRESS

The one shot pulse is generated on the OS pin by writing to address 10. This is a write-only address

and the data written to it is irrelevant.

ADDRESS 10:

ONE SHOT

3.8

CHECKSUM REGISTER

This read-only register stores the checksums generated in the diagnostic mode.

ADDRESS 11:

CHECKSUM

BIT

TYPE

NAME

DESCRIPTION

0-7

R

CHECK[0:7]

The 8 bit checksum. The checksum is generated as a non-linear feedback

accumulation of the BS, FS, I, and Q output bits. The current checksum is stored

in this register and the checksum generator is cleared whenever the internal sync

goes low (see SS_MUX in Section 3.2 for the modes of the internal sync).

3.9

I AND Q OUTPUT REGISTERS

These registers are used to capture output samples.

ADDRESS 12:

I-Output Byte 0

BIT

TYPE

NAME

DESCRIPTION

0-7

R

I[0:7]

Least significant 8 bits of the I output.

ADDRESS 13:

I-Output Byte 1

BIT

TYPE

NAME

DESCRIPTION

0-7

R

I[8:15]

Most significant 8 bits of the I output.

ADDRESS 14:

Q-Output Byte 0

BIT

TYPE

NAME

DESCRIPTION

0-7

R

Q[0:7]

Least significant 8 bits of the Q output.

ADDRESS 15:

Q-Output Byte 0

BIT

TYPE

NAME

DESCRIPTION

0-7

R

QI[8:15]

Most significant 8 bits of the Q output.

The user reads the I and Q outputs through these read-only registers. The captured samples can

be used for gain control, analysis, display, or diagnostics.