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DS28CZ04: 4Kb I2C/SMBus EEPROM with Nonvolatile PIO
writing data or through a dummy write. At power-on the read pointer is reset to address 00h of the lower half of the
memory. A description on how the read pointer is affected during write accesses is included in Table 1A. In
contrast to write accesses where the memory is updated in small blocks of 8 or 16 bytes, all 512 bytes are readable
in a single read access. Only two cases need to be distinguished: normal read and PIO direct. Table 2A explains
the cases in detail.
Table 2A. Read Access
READING WHILE DEVICE IS NOT BUSY
PIO Mode
Multi-
Address
Single-
Address
Read Pointer
Anywhere excluding
device address = A0h ,
memory address from
7Ch to 7Fh (normal read)
Device address = A0h ,
memory address from
7Ch to 7Fh (PIO direct)
Anywhere excluding
device address = A0h ,
memory address = 7Ch
(normal read)
Device address = A0h ,
memory address = 7Ch
(PIO direct)
SMBus or I2C Bus Mode
Slave address is acknowledged; data is delivered;
read pointer increments, eventually crossing from lower half to
upper half of the memory, and wraps around from upper half
FFh to lower half 00h .
Slave address is acknowledged; data is delivered;
read pointer increments and wraps around from 7Fh to 7Ch,
staying in the lower half of memory .
Slave address is acknowledged; data is delivered;
read pointer increments, eventually crossing from lower half to
upper half of the memory, and wraps around from upper half
FFh to lower half 00h .
Slave address is acknowledged; data is delivered;
read pointer stays at 7Ch .
The PIO Address Mode in conjunction with the initial read pointer position determines the sequence in which the
addresses are accessed. Figure 9 illustrates the possible cases.
Figure 9. Memory and PIO Reading
Memory Location
PIO Multi-Address Mode
PIO Single-Address Mode
Address
Function
Normal Read
PIO Direct
Normal Read
PIO Direct
00h to 77h
78h
79h
7Ah
7Bh
7Ch
7Dh
7Eh
7Fh
80h to FFh
00h to FFh
Memory
Reserved
Reserved
Register
Register
PIO R/W
PIO R/W
PIO R/W
PIO R/W
Memory
Memory
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