MT312C ZARLINK [Zarlink Semiconductor Inc], MT312C Datasheet - Page 58

• Manufacturer Part Number: MT312C
• Description: Satellite Channel Decoder
• Manufacturer: ZARLINK [Zarlink Semiconductor Inc]

MT312
9.4 Data output timing
The number of PLL clocks per Byte clock is: N =
Where: Q = 1 for QPSK, 2 for BPSK
e.g. For DVB ASTRA
The transport Stream clock rate
The time to transmit a packet
Time to output 188 bytes
The gap between packets
The gap as number of byte clocks = 1.936E-6 * 5E6
58
Data output delay (when MCLKINV = 1)
R = 204/193 for DVB, 147/135 for DSS
P = 8 for parallel byte output, 1 for serial byte output
V = Viterbi code rate, i.e. 3/4 for ASTRA
PLL = Sampling frequency MHz
RS = Symbol rate in MBaud, i.e. 27.5MBaud for ASTRA
MPEG Packet Data Output
Parameter
MCLKIV=1
MOCLK
MOSTRT
MOVAL
MDO7:0
BKERR
N
N
Figure 25 - MT312 output data wave form diagram 2
= 1 * 204/193 * 8/2 * 4/3 *90E6/27.5E6
= 18
= PLL / N
= 90E6 / 18
= 5E6Hz
= 204 * 8/2 * 4/3 *1/RS
= 1088 / RS
= 3.9564E-5 sec
= 188/5E6
= 3.76E-5 sec
= 3.9564E-5 - 3.76E-5
= 1.936E-6 sec
= 9.82
Symbol
Q*R*P
---------------- -
tOD
2*V
*
t
PLL
--------- -
RS
OD
t
Min
CLKP
truncated to an integer
t
CLKL
Typ
±2
Max
±4
Units
ns