GC4116 Datasheet, PDF (35/57 Pages) List of Unclassifed Manufacturers – MULTI-STANDARD QUAD DUC CHIP

GC4116 MULTI-STANDARD QUAD DUC CHIP
DATA SHEET REV 1.0
5.3 FREQUENCY AND PHASE PAGES (PAGES 0 AND 1)
Pages 0 and 1 are used to set the tuning frequencies and phase offsets of the four channels. Page 0 also contains the read
only checksum diagnostic register and the mask revision register.
The 32 bit frequency control word is defined as:
FREQ = 2³²F/F_CK
where F is the desired tuning frequency
and F_CK is the chip’s clock rate (not the CK2X rate). Use positive frequency values to upconvert signals. Use negative frequency
values to upconvert inverted spectrums. The 32 bit 2’s complement frequency words are entered as four bytes, the least
significant byte in the lowest address, the most significant in the highest address.
The 16 bit phase offset is defined as:
π PHASE = 2¹⁶P/2
π where P is the desired phase in radians from 0 to 2 .
PAGE 0: Channels A and B
ADDRESSES 16, 17, 18, and 19: Frequency Channel A
ADDRESS
16
17
18
19
TYPE
R/W
R/W
R/W
R/W
NAME
FREQ_A[0:7]
FREQ_A[8:15]
FREQ_A[16:23]
FREQ_A[24:31]
DESCRIPTION
Byte 0 (LSBs) of FREQ_A
Byte 1 of FREQ_A
Byte 2 of FREQ_A
Byte 3 (MSBs) of FREQ_A
ADDRESSES 20, 21: Phase Channel A
ADDRESS
20
21
TYPE
R/W
R/W
NAME
PHASE_A[0:7]
PHASE_A[8:15]
DESCRIPTION
Byte 0 (LSBs) of PHASE_A
Byte 1 (MSBs) of PHASE_A
ADDRESSES 24, 25, 26, and 27: Frequency Channel B
ADDRESS
24
25
26
27
TYPE
R/W
R/W
R/W
R/W
NAME
FREQ_B[0:7]
FREQ_B[8:15]
FREQ_B[16:23]
FREQ_B[24:31]
DESCRIPTION
Byte 0 (LSBs) of FREQ_B
Byte 1 of FREQ_B
Byte 2 of FREQ_B
Byte 3 (MSBs) of FREQ_B
ADDRESSES 28, 29: Phase Channel B
ADDRESS
20
21
TYPE
R/W
R/W
NAME
PHASE_B[0:7]
PHASE_B[8:15]
DESCRIPTION
Byte 0 (LSBs) of PHASE_B
Byte 1 (MSBs) of PHASE_B
ADDRESSES 30, 31: Checksum and Revision Registers
ADDRESS
30
31
TYPE
Ronly
Ronly
NAME
CHECKSUM
REVISION
DESCRIPTION
The 8 bit diagnostic checksum. See Section 3.14.
The 8 bit Revision number. See Section 3.16.
© 1999−2001 GRAYCHIP,INC.
- 30 -
APRIL 27, 2001
This document contains preliminary information which may be changed at any time without notice