saa6703h NXP Semiconductors, saa6703h Datasheet - Page 13

• Manufacturer Part Number: saa6703h
• Description: Xga Dual Input Flat Panel Controller.
• Manufacturer: NXP Semiconductors

Philips Semiconductors
If the write mode was selected, the bus master sends a
byte containing the starting subaddress and then a series
of data bytes. In case the read mode was selected, the
addressed slave returns a series of data bytes. A read
transfer is preceded by a write transfer that transmits the
starting subaddress.
Data transfers are aborted by the stop condition, when
SDA is changed by the master from LOW-to-HIGH level
when SCL is at HIGH-level (see Fig.4).
7.1.2.3
Bits A0 and A1 of the I
externally selected by two input pins CSG2/A0
and CSG4/A1. The device address (byte) of the
SAA6703H is shown in Table 4.
Table 4 I
2004 Apr 01
handbook, full pagewidth
handbook, full pagewidth
MSB
XGA dual input flat panel controller
0
SDA
SCL
SDA
SCL
1
2
I
C-bus device address byte
2
DEVICE ADDRESS BITS
C-bus device address
D1
1
2
C-bus device address are
START condition
D0
1
A6
ACK
0
A5
A1
D7
A4
Fig.3 Start of a data transfer.
Fig.4 End of a data transfer.
A0
D6
A3
LSB
R/W
0/1
D5
A2
13
D4
The four possible I
via resistor strapping at pins CSG2/A0 and CSG4/A1
(see Table 5).
During the hardware reset (pin RST = LOW),
pins CSG2/A0 and CSG4/A1 are 3-stated. Their status at
the trailing edge of signal RST will latch and determine the
device address. Pull-up and pull-down resistors (4.7 k
suggested) select the address. An internal pull-down
resistance of approximately 100 k is provided and
eliminates potentially the need for any external strapping
resistor. After reset, the pins carry the output of the
programmable signal generators.
Table 5 Device address selection
A1
I
2
C-BUS DEVICE
ADDRESS
D3
A0
70H
72H
74H
76H
D2
R/W
2
acknowledge/
not acknowledge
C-bus device addresses are selected
D1
ACK
PIN CSG4/A1
pull-down
pull-down
pull-up
pull-up
STRAPPING RESISTOR
D0
acknowledge
R7
A/A
STOP condition
R6
Product specification
SAA6703H
PIN CSG2/A0
MHB249
R5
pull-down
pull-down
MHB248
pull-up
pull-up