GC1012A Datasheet, PDF (22/30 Pages) Texas Instruments – DIGITAL TUNER CHIP

GC1012A DIGITAL TUNER
DATA SHEET REV 0.1
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
0-7
R
CHECK[0:7]
DESCRIPTION
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
0-7
R
I[0:7]
DESCRIPTION
Least significant 8 bits of the I output.
ADDRESS 13: I-Output Byte 1
BIT
TYPE
NAME
0-7
R
I[8:15]
DESCRIPTION
Most significant 8 bits of the I output.
ADDRESS 14: Q-Output Byte 0
BIT
TYPE
NAME
0-7
R
Q[0:7]
DESCRIPTION
Least significant 8 bits of the Q output.
ADDRESS 15: Q-Output Byte 0
BIT
TYPE
NAME
0-7
R
QI[8:15]
DESCRIPTION
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.
GRAYCHIP,INC.
- 17 -
FEBRUARY 18, 1998
This document contains information which may be changed at any time without notice