2003 Oct 01 66
Philips Semiconductors Product specification
CD audio decoder, digital servo and filterless
DAC with integrated pre-amp and laser control
SAA7826
Table 55 defect_parm parameter: defect detector control
Table 56 interrupt_mask parameter: mask to enable
interrupt in interrupt status register; RAM
address 53H
Table 57 time_parameter: timer interrupt values
Note
1. The time_parameter values are also used for
focus_start_time, motor_start_time1,
motor_start_time2, radial_init_time and brake_time.
Table 58 phase_shift parameter: focus/radial AGC
detection phase shift; RAM address 67H
Note
1. The value a is the value programmed in Table 60 as
the 6 LSBs of osc_inc.
defect_parm Fast filter bandwidth
xxxx xx00 3500 Hz
xxxx xx01 7000 Hz
xxxx xx10 14000 Hz
xxxx xx11 reserved for future use
defect_parm Slow filter time
constant
Alpha value
xxxx 10xx 16 ms 0.00006
xxxx 11xx 8 ms 0.00012
xxxx 00xx 4 ms 0.00024
xxxx 01xx 2 ms 0.00048
defect_parm
Coefficient β value
xx00 xxxx 0.25
xx01 xxxx 0.125
xx10 xxxx 0.0625
xx11 xxxx reserved for future use
defect_parm Defect detector maximum ON time
00xx xxxx 1.0 ms
01xx xxxx 1.5 ms
10xx xxxx 2.0 ms
11xx xxxx 2.5 ms
interrupt_mask Interrupt enabled
0000 0000 no interrupt
xxxx xxx1 focus lost
xxxx xx1x subcode ready
xxxx x1xx subcode absolute seconds
changed
xxxx 1xxx subcode discontinuity
xxx1 xxxx radial error
xx1x xxxx autosequencer state
changes
x1xx xxxx autosequencer error
time_parameter value
(decimal)
(1)
Timer interrupt values
wait time (ms)
129 ≤ i ≤ 143 4.26 × (i − 128)
144 ≤ i ≤ 159 68.2 + 4.57 × (i − 144)
160 ≤ i ≤ 175 141.4 + 4.92 × (i − 160)
176 ≤ i ≤ 191 224.1 + 5.33 × (i − 176
192 ≤ i ≤ 207 305.4 + 5.82 × (i − 192
208 ≤ i ≤ 223 398.5 + 6.40 × (i − 208)
224 ≤ i ≤ 239 500.8 + 7.11 × (i − 224
2402 ≤ i ≤ 55 614.6 + 8.00 × (i − 240)
0 ≤ i ≤ 15 742.6 + 9.11 × i
16 ≤ i ≤ 31 888.9 + 10.6 × (i − 16)
32 ≤ i ≤ 47 1059 + 12.8 × (i − 32)
48 ≤ i ≤ 63 1263 + 16.0 × (i − 48)
64 ≤ i ≤ 79 1519 + 21.2 × (i − 64)
80 ≤ i ≤ 95 1860 + 32.0 × (i − 80)
96 ≤ i ≤ 111 2372 + 64.0 × (i − 96)
111 3398.0
112...127 infinite
phase_shift
(decimal)
Focus/radial AGC detection phase
shift
(µs) (deg)
00 0
1×a
(1)
60.47 180 × (a/128)
2 × a 120.94 180 × (2 × a/128)
i × ai×60.47 180 × (i × a/128)
128 180
−1 × a −60.47 −180 × (a/128)
−2 × a −120.94 −180 × (2 × a/128)
−i × a −i × 60.47 −180 × (i × a/128)
128 180
