CAT24C208 Просмотр технического описания (PDF) - Catalyst Semiconductor => Onsemi
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CAT24C208 Datasheet PDF : 13 Pages
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CAT24C208
The segment pointer is at the address 60h and is write-
only. This means that a memory access at 61h will give
undefined results. The segment pointer is a volatile
register. The device configuration register at 62/63 (hex)
is a non-volatile register. The configuration register will
be shipped in the erased (set to FFh) state.
The segment pointer is used to expand the available
DDC address space while maintaining backward com-
patibility with older DDC interfaces such as DDC2B. For
each value of the 8-bit segment pointer one segment
(256 bytes) is available at the A0/A1 pair. The standard
DDC 8-bit address is sufficient to address each of the
256 bytes within a segment. Note that if the segment
pointer is set to 00h then the device will behave like a
standard DDC2B EEPROM.
Read and write with segment pointer can expand the
addressable memory to 512 bytes in each bank with
wraparound to the next segment in the same bank only.
The two banks can be individually selected by the
configuration register and EDID Sel pin, as shown in
figure 19. The segments are selected by the two bits S S
10
= 00 or 01 in the segment address.
Figures 7 to 10 show the random read, sequential read,
byte write and page write.
Figure 7. Random Access Read
START 0110 0000 ACK
START 1010 0000 ACK
xxxx xxS1S0 Segment ADDRESS
A7 - A0 ADDRESS
ACK
ACK
START 1010 0001 ACK DATA NOACK STOP
Figure 8. 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 9. Byte Write
START 0110 0000 ACK xxxx xxS1S0 Segment ADDRESS ACK
START 1010 0000 ACK
A7 - A0 ADDRESS
ACK DATA
ACK
STOP
Figure 10. Page Write
START 0110 0000 ACK
START 1010 0000 ACK
xxxx xxS1S0 Segment ADDRESS
ACK
A7 - A0 ADDRESS
ACK DATA0 ACK
..........
DATA15
ACK
STOP
Doc. No. 1044, Rev. F
8
© 2006 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
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