MAS 3507D
PRELIMINARY DATA SHEET
3.7. Memory Area
3.7.1. Status Memory
The memory cells given in the following table should be accessed by the ‘read control interface data’ I2C command
(see Section 3.3.2. on page 21) because only the 16 LSBs of these memory blocks are used. The memory area
table is a consecutive memory block in the D0 memory that keeps all important status information that monitors the
MPEG decoding process. The ‘read control interface data’ command resets the MPEG-FRAME-SYNC at PI4 as
described in Section 2.9.
Table 3–10: Status Memory Area
Address
D0:$300
D0:$301
D0:$302
D0:$303
D0:$304
Offset1)
R/W
Name
Function
0
1
2
3
4
5
r
r
r
r
r
r
MPEGFrameCount
MPEGStatus1
MPEGStatus2
CRCErrorCount
NumberOfAncillaryBits
AncillaryData
counts the MPEG frames
MPEG header / status information
MPEG header
counts CRC errors during MPEG decoding
number of bits in ancillary data
organized in words a 16 bit (MSB first)
D0:$305
... $321
1) Offset applies to the ‘read control interface data’ command
3.7.1.1. MPEG Frame Counter
Address
Offset
R/W
Name
Function
D0:$300
0
r
MPEGFrameCount
counts the MPEG frames
The counter will be incremented with each new frame that is decoded. With an invalid MPEG bit stream as its input
(e.g. if an invalid header is detected), the MAS 3507D resets the MPEGFrameCount cell to ‘0’. The MPEGFrame-
Count is also returned by the ‘default read’ command as described in Section 3.3.9.
30
Micronas
MICRONAS [ MICRONAS ]
