saa7146a NXP Semiconductors, saa7146a Datasheet - Page 118

• Manufacturer Part Number: saa7146a
• Description: Multimedia Bridge, High Performance Scaler And Pci Circuit Spci
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Table 112 Transfer control register (IICTRF)
Table 113 ATTRx1 and ATTRx0; attribute information for BYTEx
Note
1. The generation of NA or A is performed by the controller hardware and is not user accessible.
7.17.2.1
2004 Aug 25
8C
ATTRx1 ATTRx0 SYMBOL
1
1
0
0
S: I
DA: 7-bit Device Address (BYTEx7 to BYTEx1)
R/W: Read/Write# bit (BYTEx0)
D: receive/transmit Data (BYTEx)
A: Acknowledge
NA: Negative Acknowledge (also used for identification of last master read data byte)
P: I
Multimedia bridge, high performance
Scaler and PCI circuit (SPCI)
OFFSET
(HEX)
2
2
C-bus START command
C-bus STOP command.
1
0
1
0
Abbreviations used in Table 113
BYTE2
BYTE1
BYTE0
ATTR2 [1:0]
ATTR1 [1:0]
ATTR0 [1:0]
ERR
BUSY
NAME
START
CONT
STOP
NOP
S
31 to 24
23 to 16
15 to 8
7 and 6
5 and 4
3 and 2
1
0
start and address device, use BYTEx [7:1] as DA7 to D1 and BYTEx [0] as R/W bit
transfer D and continue, use BYTEx [7:0] as D7 to D0
transfer D and stop, use BYTEx as D7 to D0
no operation, don’t use this byte
BIT
DA7 to DA1
D7 to D0
D7 to D0
RW
RW
RW
RW
RW
RW
RW
RW
TYPE
data/address register 2
data/address register 1
data/address register 0
attribute information for BYTE2
attribute information for BYTE1
attribute information for BYTE0
general error flag: has to be reset by clearing IICSTA
operation ongoing
118
PROTOCOL FUNCTION
DESCRIPTION
Product specification
R/W
SAA7146A
A
A
A/NA
(1)
(1)
(1)
P