SAA7207H Datasheet, PDF (6/20 Pages) NXP Semiconductors – Reed Solomon decoder IC

FUNCTIONAL DESCRIPTION
Input interface (see Fig.3)
The received input data stream is a sequence which is interpreted as a stream of bytes. The bits are assumed to be non-byte aligned and sent in
MSB to LSB order. New data may be present at the input pins on each rising edge of the master clock input (CLK). Valid data is indicated by
VALI = HIGH. When VALI = LOW the data is not valid and will be neglected. There are no limitations imposed on valid/non-valid sequences.
The Quadrature Amplitude Modulation (QAM) of the input data is given in Table 1.
Table 1 Quadrature amplitude modulation; note 1
QUADRATURE AMPLITUDE MODULATION⁽²⁾
SLOT
256 QAM
64 QAM
32 QAM
16 QAM
DATA1 DATA0 VALI DATA1 DATA0 VALI DATA1 DATA0 VALI DATA1 DATA0 VALI
0
S_n-1 [7] S_n-1 [6]
1
S_n-1 [5] S_n-1 [4]
1
S_n-1 [4] S_n-1 [3]
1
S_n-1 [3] S_n-1 [2]
1
1
S_n-1 [5] S_n-1 [4]
1
S_n-1 [3] S_n-1 [2]
1
S_n-1 [2] S_n-1 [1]
1
S_n-1 [1] S_n-1 [0]
1
2
S_n-1 [3] S_n-1 [2]
1
S_n-1 [1] S_n-1 [0]
1
X
X
0
X
X
0
3
S_n-1 [1] S_n-1 [0]
1
X
X
0
X
X
0
X
X
0
4
S_n [7] S_n [6]
1
S_n [5] S_n [4]
1
S_n-1 [0] S_n [4]
1
S_n [3] S_n [2]
1
5
S_n [5] S_n [4]
1
S_n [3] S_n [2]
1
S_n [3] S_n [2]
1
S_n [1] S_n [0]
1
6
S_n [3] S_n [2]
1
S_n [1] S_n [0]
1
S_n [1] S_n [0]
1
X
X
0
7
S_n [1] S_n [0]
1
X
X
0
X
X
0
X
X
0
Notes
1. X = don’t care.
2. The numbers given in parenthesis refer to the bit numbers.
4 QAM
DATA1 DATA0
S_n-1 [1]
X
X
X
S_n [1]
X
X
X
S_n-1 [0]
X
X
X
S_n [0]
X
X
X
VALI
1
0
0
0
1
0
0
0