CAT24C208 Просмотр технического описания (PDF) - Catalyst Semiconductor => Onsemi
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CAT24C208 Datasheet PDF : 13 Pages
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CAT24C208
DSP Interface
The DSP interface is similar to I2C bus serial interface.
Without the segment pointer, the maximum accessible
memory space is 256 bytes of segment 00h only. In the
sequential mode the wrap around will be in the same
segment also. Figures 11 to 14 show the read and write
on the DSP Port.
Figure 11. Random Access Read
START 1010 0000 ACK A7 - A0 ADDRESS ACK
START 1010 0001 ACK
DATA NOACK STOP
Figure 12. Sequential Read
START 1010 0000 ACK A7 - A0 ADDRESS ACK START 1010 0001 ACK DATA0 ACK ..... DATAN NOACK STOP
Figure 13. Byte Write
START 1010 0000 ACK A7 - A0 ADDRESS ACK
DATA
ACK STOP
Figure 14. Page Write
START 1010 0000 ACK A7 - A0 ADDRESS ACK DATA0 ACK
......
DATA15 ACK STOP
The segment pointer is used to expand the available
DSP port addressable memory to 1k bytes, divided into
four segments of 256 bytes each. The four segments are
selected by two bits S1S0 = 00, 01, 10, 11 in the segment
address. Figures 15 to 18 show the random read,
sequential read, byte write and page write.
Figure 15. Random Access Read
START 0110 0000 ACK
START 1010 0000 ACK
xxxx xxS1S0 Segment ADDRESS ACK
A7 - A0 ADDRESS
ACK START 1010 0001 ACK
DATA NOACK STOP
Figure 16. Sequential Read
START 0110 0000 ACK
xxxx xxS1S0 Segment ADDRESS
ACK
START 1010 0000 ACK A7 - A0 ADDRESS ACK START 1010 0001 ACK DATA0 ACK ....... DATAN NOACK STOP
Figure 17. Byte Write
START 0110 0000 ACK
START 1010 0000 ACK
xxxx xxS1S0 Segment ADDRESS
A7 - A0 ADDRESS
ACK
ACK
DATA
ACK STOP
Figure 18. Page Write
START 0110 0000 ACK
xxxx xxS1S0 Segment ADDRESS
START 1010 0000 ACK A7 - A0 ADDRESS ACK DATA0
ACK
ACK
...... DATA15 ACK STOP
© 2006 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
9
Doc No. 1044, Rev. F
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