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31 Wed May 28 17:37:25 1997
Draft 1/21/97
L64007 MPEG-2, DVB, JSAT Transport Demultiplexer Technical Manual
4-31
PRE.4 for Rev. D
Copyright 1997 by LSI Logic Corporation. All rights reserved.
reset. To resume operation after reset, the user might
have to reprogram the register les with initial values. An
internal reset pulse is generated only one time when
there is a write to SMR with RST = 1. A reset pulse is
generated whenever there is a write to SMR and the RST
bit is 1. A reset reverts the RST bit to 0, which is not a
registered value. Thus, this bit is always read as 0.
4.8.4
Channel
Decoder Status
Register (CSR)
The CSR is a 16-bit read-only register that provides information on the
current status of the channel decoder interface. The CSR content is usu-
ally read by the host processor while servicing an interrupt caused by a
channel decoder interface event.
After the CSR is read, the channel decoder interrupt bit in the SSR is
reset to 0.
RES
Reserved
[15:7]
These bits are reserved.
CHALT
Channel Halt
6
This bit determines whether the channel decoder inter-
face is in operation (when set to 0) or not (when set to
1). This bit reects the set/reset status of the start bit in
PCR_DI
PCR Discontinuity
5
When set to 1, this bit indicates that a PCR discontinuity
in the PCR_PID packet has been detected. The value
represents a new time base, since a discontinuity condi-
tion in the PCR_PID packets has been detected. The rst
PCR in the discontinuity event is used as a reference
value for a new frequency lock procedure.
After the CSR is read, the PCR_DI bit is reset to 0 (no
PCR discontinuity has been detected).
PCR_IN
PCR Arrived
4
When set to 1, this bit indicates that a new PCR value for
the programmable PCR_PID has arrived in the channel
decoder interface and clock reference unit. When a PCR
15
7
6
5432
1
0
RES
CHALT
PCR
DI
PCR
IN
CH
OVF
TEI
SYNC
OFF
SYNC
ON