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CAT24C208WIT3 Datasheet(PDF) 10 Page - Catalyst Semiconductor |
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CAT24C208WIT3 Datasheet(HTML) 10 Page - Catalyst Semiconductor |
10 / 13 page CAT24C208 10 Doc. No. 1044, Rev. F © 2006 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice CONFIGURATION REGISTER Function Description: NB: Number of memory banks in DDC port memory map. 0 = 2 Banks, 1 = 1 Bank AB0: Active Bank Control Bit 0 (See Figure 19) AB1: Active Bank Control Bit 1 (See Figure 19) WE DDC: Write Enable 0 = Write Disabled, 1= Write Enabled Note: WE affects only write operations from the DDC port, not the display port. The display port always has write access. Figure 19. Configuration Register Truth Table ARBITRATION The device performs a simplistic arbitration between the DDC and DSP ports. While the arbitration scheme described is not foolproof, it does prevent most errors. Arbitration logic within the device monitors activity on DDC_SCL and DSP_SCL. When both I2C ports are idle, DDC_SCL and DSP_SCL are both high and the arbitration logic is inactive. When a START condition is detected on either port, the opposite port SCL line is pulled low, holding off activity on that port. When the initiating SCL line has remained high for one full second, the arbitration logic assumes that the initiating devices is finished and releases the other SCL line. If the non- initiating device has been waiting for access, it can now read or write the device. 1 B A0 B AB N D I D E n i P t c e l e S k n a B e v i t c A 0X 0 0 k n a B r e w o L 0X 0 1 k n a B r e p p U 10 0 X k n a B r e w o L 11 0 X k n a B r e p p U XX 1 X k n a B ) y l n o ( r e w o L The configuration register is a non-volatile register and is available from either DSP or DDC port at address 62h/ 63h for write and read resp. Figure 20. Read Configuration Register Figure 21. Write Configuration Register T R A T S0 1 0 0 0 1 1 0K C AS S E R D D A Y M M U DK C AB N 0 B A 1 B A E W X X X XK C AP O T S T R A T S1 1 0 0 0 1 1 0K C AA T A DK C A O NP O T S n o i t c n u F r e t s i g e R B S MB S L 76 5 4 3 2 1 0 r e t s i g e R n o i t a r u g i f n o C XX X X E W1 B A0 B AB N |
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