X24645 Datasheet, PDF (8/18 Pages) Xicor Inc. – Advanced 2-Wire Serial E 2 PROM with Block Lock TM Protection

X24645
Sequential Read
Sequential reads can be initiated as either a current
address read or random access read. The first byte is
transmitted as with the other modes, however, the
master now responds with an acknowledge, indicating
it requires additional data. The X24645 continues to
output data for each acknowledge received. The read
operation is terminated by the master; by not
responding with an acknowledge and then issuing a
stop condition.
The data output is sequential, with the data from
address n followed by the data from n + 1. The address
counter for read operations increments all address bits,
allowing the entire memory contents to be serially read
during one operation. At the end of the address space
(address 8191), the counter “rolls over” to 0 and the
X24645 continues to output data for each acknowledge
received. Refer to Figure 9 for the address,
acknowledge and data transfer sequence.
Figure 9. Sequential Read
BUS ACTIVITY:
MASTER
SLAVE
ADDRESS
SDA LINE
A
BUS ACTIVITY:
C
X24645
K
DATA n
A
A
A
C
C
C
K
K
K
DATA n+1
DATA n+2
S
T
O
P
P
DATA n+x
2783 ILL F13
Figure 10. Typical System Configuration
SDA
SCL
MASTER
TRANSMITTER/
RECEIVER
SLAVE
RECEIVER
SLAVE
TRANSMITTER/
RECEIVER
MASTER
TRANSMITTER
MASTER
TRANSMITTER/
RECEIVER
VCC
PULL-UP
RESISTORS
2783 ILL F14
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