GC5016 Datasheet, PDF (73/88 Pages) Texas Instruments – WIDEBAND QUAD DIGITAL DOWN CONVERTER/ UP CONVERTER

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17.10 Transmit Input Formatter Controls
GC5016
SLWS142G − JANUARY 2003 − REVISED NOVEMBER 2005
The Transmit Input Formatter section is used to set the mode of the Transmit Input logic, control the Frame Strobe
timing in Transmit mode, and to control the time when the customer logic − Transmitter input(s) are sampled.
Rcv Tx FIELD
X
C tinf_bits
X
C tinf_pins
X
C tinf_iqmux
X
C tinf_pariq
X
C tinf_src
C
C tinf_xmt
C
C fso_sel
Table 30. Transmit Input Formatter Page 0x13 Address 0x10
BITS Dflt
DESCRIPTION
2..0
Bits per word 0 − quiet, else bits = 4 x tinf_bits. Values 6 and 7 are illegal.
5..3
Active pins quiet (0), four pins (1), 8 pins (2), 16 pins (4), illegal (else)
6
IQ multiplexed (1) or real (0) inputs
7
IQ parallel (1) or not (0) I is bits 15..8 Q is bits 7..0
10..8
Source channel A normal (2),TDM (6), test (0); channels B−D normal (2), TDM (1), test (0)
11
Transmit (1) or receive (0)
13..12
Frame strobe output select quiet (0), xmt (1), receive (2), illegal (3)
Rcv Tx
FIELD
X
E tinf_first
X
E tinf_second
D
D sck_div
X
C tinf_fso_dly
Table 31. Transmit Frame Strobe Page 0x13 Address 0x11
BITS Dflt
DESCRIPTION
3..0
Transmit input frame strobe load first word
7..4
Transmit input frame strobe load second word
11..8 0
divided clock, develops channel clock as sck_period = (1 + sck_div) * ck_period
14..12
Transmit input frame strobe output delay values from 1 to 7 divided clocks * (sck_div+1)
Rcv Tx
FIELD
X
E tinf_fs_cnt
X
E tinf_nfs
Table 32. Transmit Frame Counter Page 0x13 Address 0x12
BITS Dflt
DESCRIPTION
11..0
Transmit frame strobe count distance between frame strobes in divided clocks
15..12
Transmit number of frame strobes between fir_swap toggles
17.11 Gain and AGC Controls
The Gain Controls, gain_lsb, and gain_msb, and agc controls set the scale of the Receive output, or Transmit input
after formatting. The agc controls can be used in the receive mode. See the DUC Gain, DDC Gain, and AGC
application notes.
Rcv Tx
FIELD
C
C gain_lsb
BITS
15..0
Table 33. gain_lsb Page 0x13 Address 0x13
Dflt
DESCRIPTION
Lower 16 bits of gain (gain is scaled by 4096)
Table 34. Gain Controls Page 0x13 Address 0x14
Rcv Tx
FIELD
BITS Dflt
DESCRIPTION
C
C gain_msb
2..0
Upper 3 bits of gain
D
D agc_freeze 3
1
Freezes adaptive gain
C
C gain_rnd
8..4
Rounds off bottom 0 to 16 bits of a 20-bit word
C
C gain_half
9
Saturates gain output at 1/2. Used in xmt for symmetric filters
D
D agc_hold
10
0
Gain tracks when low, holds when high for uP gain read back
D
D agc_gain_out 11
0
Puts agc information into lower 8 bits of output data
D
D agc_zmag
15..12 0
AGC mask for defining zero signal for faster AGC adaptation. Masks off bottom 0, 1, 2, 3, or
4 bits (0xF, E, C, 8, or 0)
Table 35. AGC Minimum Adaptation Limit Page 0x13 Address 0x15
Rcv Tx
FIELD
D
D agc_min
BITS
15..0
Dflt
DESCRIPTION
0
AGC minimum adaptation limit. Lower limit for adapted gain is manual_gain − agc_min
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