STV2050A STMicroelectronics, STV2050A Datasheet - Page 16

• Manufacturer Part Number: STV2050A
• Description: IC DGTL CONVERGENCE PROC 80-PQFP
• Manufacturer: STMicroelectronics
• Type: Videor

Specifications of STV2050A

• Applications: HDTV
• Mounting Type: Surface Mount
• Package / Case: 80-MQFP, 80-PQFP
• Case: QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

STV2050A - SLAVE I²C BUS INTERFACE
If the autoincrement function is enabled, the internal address is automatically incremented
after 3 bytes are either written or read. When the autoincrement counter reaches the CF ad-
dress, the counter stops counting and any additional data will be written to or read from the CF
address.
3.2 COLOR BANK SELECTION
As previously mentioned, the embedded RAM is mapped in 3 banks called the “Red and I²C
Bank”, “Green Bank” and the “Blue Bank”. A bank is selected using the CBS[1:0] (Color Bank
Selection) bits located in the E7 register address.
However, sub-addresses D0 to EF and FE (physically mapped in the “Red and I²C Bank”) are
independent of the actual bank selection.
3.3 WRITE COMMANDS
Three formats of write commands are supported:
– 5-byte write commands to any valid sub-address
– 2-byte write commands for defining a sub-address cursor position or for changing the
– Auto-increment write commands for sub-address range 00 to CF
When a group of three data bytes within the 00 to E2 address range has been received, the
slave will store them in the appropriate embedded RAM location. Only complete groups of
three data bytes are stored. I²C registers start to be updated when the first data byte is re-
ceived. Only complete bytes are written.
All write commands which do not comply with the formats described above are rejected.
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If the auto-increment function is enabled, the internal address is at SA+1 after the command,
otherwise it is still at SA.
current sub-address without transmitting data.
The sub-address is at SA after the command.
If the auto-increment function is enabled, the internal address counter is incremented each
time 3 bytes are written:
otherwise every group of 3 bytes is written to SA and the sub-address does not change.
CBS[1:0]
S DW SA D0 D1 D2 P
S DW SA P
S DW SA
S DW SA
00 = Red and I²C bank selected
01 = Green bank selected
10 = Blue bank selected
11 = Red and I²C bank selected
i
i
D
D
i
i
0 D
0 D
i
i
1 D
1 D
i
i
2 D
2 D
i+1
i
0 D
0 D
i
1 D
i+1
1 D
i
2... ... Dn P
i+1
2... Dn P