ISL59450 Datasheet, PDF (36/37 Pages) Intersil Corporation – Multiformat Video Crosspoint with Integrated Sync Separator

ISL59450
1
0
A7
A6
1
0
D7
D6
Signals from
the Host
SDA Bus
Signals from
the ISL59450
START Command
ISL59450 Serial Bus
0
0
0
1
A5
A4
A3
A2
START Command
ISL59450 Serial Bus
0
0
0
1
R/W
Address 0
A1 A0
R/W
Address 1
Signals the beginning of serial I/O
ISL59450 Device Select Address Write
The first 7 bits of the first byte select the ISL59450 on the 2-wire
bus at the address set by the Address pin. R/W = 0, indicating
the next transaction will be a write.
ISL59450 Register Address Write
This sets the initial address of the ISL59450’s configuration
register for subsequent reading.
Ends the previous transaction and starts a new one
ISL59450 Serial Bus Address Read
This is the 7-bit address of the ISL59450 on the 2-wire bus. The
address is 0x85 if pin 92 is low, 0x87 if pin 92 is high. R/W = 1,
indicating next transaction(s) will be a read.
ISL59450 Register Data Read(s)
D5
D4
D3
D2
D1
D0 _{This is the data read from the ISL59450’s configuration register.}
(Repeat if desired)
Note: The ISL59450’s Configuration Register’s address pointer
auto increments after each data read. Repeat this step to read
multiple sequential bytes of data from the Configuration Register.
STOP Command
Signals the ending of serial I/O
R
S
T _{Serial Bus}
A
R
Address
T
Register
Address
E
S
T _{Serial Bus}
A
R
Address
T
Data
Read*
S
T
A
O
P
C
a a a a a a a 0 AAAAAAAA a a a a a a a 1
K
A
A
C
C
A
C
d
d
d
d
d
d
d
d
K
K
K
* The data read step may be repeated to read
from the ISL59450’s Configuration Register
sequentially, beginning at the Register
Address written in the two previous steps.
FIGURE 38. CONFIGURATION REGISTER READ
36
FN7510.0
February 14, 2008