CAT24C208(2009) Просмотр технического описания (PDF) - ON Semiconductor

Номер в каталоге

Компоненты Описание

производитель

CAT24C208
(Rev.:2009)

8 kb Dual Port Serial EEPROM

ON Semiconductor 

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 14 to 17 show the read and write on

the DSP Port.

START

1010 0000

ACK

A7 − A0 ADDRESS ACK START 1010 0001

Figure 14. Random Access Read

ACK DATA

NOACK

STOP

START 1010 0000 ACK A7 − A0 ADDRESS ACK START 1010 0001 ACK DATA0 ACK ......... DATAN NOACK STOP

Figure 15. Sequential Read

START

1010 0000

ACK

A7 − A0 ADDRESS

ACK

DATA

ACK

STOP

Figure 16. Byte Write

START 1010 0000 ACK

A7 − A0 ADDRESS

ACK DATA0 ACK

Figure 17. Page Write

.........

DATA15 ACK STOP

The segment pointer is used to expand the available DSP

port addressable memory to 1 k 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 18 to 21 show the random read, sequential read, byte

write and page write.

START

START

0110 0000

1010 0000

ACK

ACK

xxxx xxS1S0 Segment ADDRESS

ACK

A7 − A0 ADDRESS

ACK START 1010 0001 ACK DATA NOACK STOP

Figure 18. Random Access 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 19. Sequential Read

START

START

0110 0000

1010 0000

ACK

ACK

xxxx xxS1S0 Segment ADDRESS

A7 − A0 ADDRESS

ACK

ACK

DATA

Figure 20. Byte Write

ACK

STOP

START 0110 0000 ACK

START 1010 0000 ACK

xxxx xxS1S0 Segment ADDRESS

A7 − A0 ADDRESS ACK

DATA0

ACK

ACK ......... DATA15 ACK STOP

Figure 21. Page Write

http://onsemi.com

7

Share Link: