Specifications

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SLWS142J − JANUARY 2003 − REVISED AUGUST 2007
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17.10 Transmit Input Formatter Controls
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.
Table 30. Transmit Input Formatter Page 0x13 Address 0x10
Rcv Tx FIELD BITS Dflt DESCRIPTION
X C tinf_bits 2..0 Bits per word 0 − quiet, else bits = 4 x tinf_bits. Values 6 and 7 are illegal.
X C tinf_pins 5..3 Active pins quiet (0), four pins (1), 8 pins (2), 16 pins (4), illegal (else)
X C tinf_iqmux 6 IQ multiplexed (1) or real (0) inputs
X C tinf_pariq 7 IQ parallel (1) or not (0) I is bits 15..8 Q is bits 7..0
X C tinf_src 10..8 Source channel A normal (2),TDM (6), test (0); channels B−D normal (2), TDM (1), test (0)
C C tinf_xmt 11 Transmit (1) or receive (0)
C C fso_sel 13..12 Frame strobe output select quiet (0), xmt (1), receive (2), illegal (3)
Table 31. Transmit Frame Strobe Page 0x13 Address 0x11
Rcv Tx FIELD BITS Dflt DESCRIPTION
X E tinf_first 3..0 Transmit input frame strobe load first word
X E tinf_second 7..4 Transmit input frame strobe load second word
D D sck_div 11..8 0 divided clock, develops channel clock as sck_period = (1 + sck_div) * ck_period
X C tinf_fso_dly 14..12 Transmit input frame strobe output delay values from 1 to 7 divided clocks * (sck_div+1)
Table 32. Transmit Frame Counter Page 0x13 Address 0x12
Rcv Tx FIELD BITS Dflt DESCRIPTION
X E tinf_fs_cnt 11..0 Transmit frame strobe count distance between frame strobes in divided clocks
X E tinf_nfs 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.
Table 33. gain_lsb Page 0x13 Address 0x13
Rcv Tx FIELD BITS Dflt DESCRIPTION
C C gain_lsb 15..0 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 BITS Dflt DESCRIPTION
D D agc_min 15..0 0 AGC minimum adaptation limit. Lower limit for adapted gain is manual_gain − agc_min