SAA7207H Datasheet, PDF (9/20 Pages) NXP Semiconductors – Reed Solomon decoder IC

Philips Semiconductors
Reed Solomon decoder IC
Product specification
SAA7207H
Table 5 Read (R/W = 1)
BYTE
1st byte
2nd byte
3rd byte
4th byte
LOGIC LEVEL
0
0
S⁽²⁾
−
−
−
−
−
Notes
1. Input data bits for Port 5 to Port 0.
2. When S = 0 it is in sync status; when S = 1 it is in no sync status.
DESCRIPTION
input data Port 5 to Port 0⁽¹⁾
bits 22 to 16 of CorrCount
bits 15 to 8 of CorrCount
bits 7 to 0 of CorrCount
The CorrCount is an estimation for the Byte Error Rate (BER) of the channel. This estimation is good for a high
signal-to-noise ratio (SNR); then all uncorrected blocks will not have more than 9 errors. The CorrCount is incremented
by 1 for each corrected byte. Each uncorrectable or unsychronized block will increment the CorrCount by 9. The
CorrCount will saturate at ‘7FFFFFH’ so that value actually means ‘counter overflow’.
A CorrCount reset is caused by the following:
• A hardware or software reset
• Reading the 4th byte.
book, full pagewidth
CLK
DATA1
DATA0
VALI
Tsymbol
SLOT 0
SLOT 1
SLOT 2
SLOT 3
SLOT 4
MBH318
Fig.3 Input Interface.
1996 Jul 17
9