ISL5416 Datasheet, PDF (31/71 Pages) Intersil Corporation – Four-Channel Wideband Programmable DownConverter

ISL5416
TABLE 13. CHANNEL CONTROL REGISTERS (READS) (Continued)
FEDCBA9 8 7 6 5 4 3 2 1 0
DESCRIPTION
* * * * 0 0 0 0 0 0 0 1 1 0 0 1 N/A (STROBE)
****
1 1 0 1 0 N/A (STROBE)
* * * * 0 0 0 0 0 0 0 1 1 0 1 1 N/A (STROBE)
* * * * 0 0 0 0 0 0 0 1 1 1 0 0 N/A (STROBE)
*01D - *03E UNUSED
* * * * 0 0 0 0 0 0 0 1 1 1 1 1 CHANNEL STATUS
*03F - *07F UNUSED
* * * * 0 0 0 1 0 0 0 0 0 0 0 0 FIR1 COEFFICIENTS
THRU
* * * *000100011111
*120 - *1FF UNUSED
* * * * 0 0 1 0 0 0 0 0 0 0 0 0 FIR2 COEFFICIENTS
THRU
* * * *001000111111
*240 - *FFF UNUSED
TABLE 14. CHANNEL STATUS BITS (*01Fh) ONCE SET, STATUS BITS STAY SET UNTIL CLEARED BY A WRITE TO *01Fh
BITS
DESCRIPTION
15
FIFO crossed threshold
14
FIFO empty
13
FIFO full
12
Saturation in IHBF (I or Q)
11
Saturation in Q channel 24 -> 16 bit rounder (to FIFO prior to IHBF)
10
Saturation in I channel 24 -> 16 bit rounder (to FIFO prior to IHBF)
9
UNUSED.
8
Saturation in AGC forward gain path (I or Q)
7
Saturation in Q channel FIR2
6
Saturation in I channel FIR2
5
Saturation in Q channel FIR1 to FIR2 gain block
4
Saturation in I channel FIR1 to FIR2 gain block
3
Saturation in Q channel FIR1
2
Saturation in I channel FIR1
1
Saturation in Q channel CIC to FIR1 gain block
0
Saturation in I channel CIC to FIR1 gain block
NOTE: FIR Saturation bits will indicate saturation if an intermediate accumulation exceeds 1.0, even though, the final result is less than 1.0. The
headroom for intermediate sums of products is up to 16 (2⁴).
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