CAT24WC129 Datasheet, PDF (6/8 Pages) Catalyst Semiconductor – 128K-Bit I2C Serial CMOS E2PROM

CAT24WC129
Preliminary
acknowledge, and internally increment the six low order
address bits by one. The high order bits remain un-
changed.
If the Master transmits more than 64 bytes before sending
the STOP condition, the address counter ‘wraps around’,
and previously transmitted data will be overwritten.
When all 64 bytes are received, and the STOP condition
has been sent by the Master, the internal programming
cycle begins. At this point, all received data is written to
the CAT24WC129 in a single write cycle.
Acknowledge Polling
Disabling of the inputs can be used to take advantage of
the typical write cycle time. Once the stop condition is
issued to indicate the end of the host's write operation,
CAT24WC129 initiates the internal write cycle. ACK
polling can be initiated immediately. This involves issu-
ing the start condition followed by the slave address for
a write operation. If CAT24WC129 is still busy with the
write operation, no ACK will be returned. If
CAT24WC129 has completed the write operation, an
ACK will be returned and the host can then proceed with
the next read or write operation.
WRITE PROTECTION
The Write Protection feature allows the user to protect
against inadvertent programming of the memory array.
If the WP pin is tied to VCC, the top 1/4 array of memory
(locations 3000H to 3FFFH) is protected and becomes
read only. The CAT24WC129 will accept both slave and
byte addresses, but the memory location accessed is
protected from programming by the device’s failure to
send an acknowledge after the first byte of data is
received.
READ OPERATIONS
The READ operation for the CAT24WC129 is initiated in
the same manner as the write operation with one excep-
tion, that R/W bit is set to one. Three different READ
operations are possible: Immediate/Current Address
READ, Selective/Random READ and Sequential READ.
Immediate/Current Address Read
The CAT24WC129’s address counter contains the ad-
dress of the last byte accessed, incremented by one. In
other words, if the last READ or WRITE access was to
address N, the READ immediately following would ac-
cess data from address N+1. If N=E (where E=16383),
then the counter will ‘wrap around’ to address 0 and
continue to clock out data. After the CAT24WC129
receives its slave address information (with the R/W bit
set to one), it issues an acknowledge, then transmits the
8 bit byte requested. The master device does not send
an acknowledge, but will generate a STOP condition.
Selective/Random Read
Selective/Random READ operations allow the Master
device to select at random any memory location for a
READ operation. The Master device first performs a
Figure 6. Byte Write Timing
S
T
BUS ACTIVITY: ^A SLAVE
MASTER ^R ADDRESS
T
BYTE ADDRESS
A15–A8
A7–A0
S
T
DATA
O
P
SDA LINE S
*=Don't Care Bit
**
A
A
C
C
K
K
P
A
A
C
C
K
K
24WC129 F08
Figure 7. Page Write Timing
S
T
BUS ACTIVITY: ^A SLAVE
MASTER ^R ADDRESS
T
BYTE ADDRESS
A15–A8
A7–A0
SDA LINE S
**
A
A
A
C
C
C
K
K
K
*=Don't Care Bit
DATA
DATA n
S
T
DATA n+63
O
P
P
A
AA
A
C
CC
C
K
KK
K
24WC129 F09
Doc. No. 25065-00 6/99 S-1
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