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2004 Jan 26 33
Philips Semiconductors Product specification
MPEG-2 video and MPEG-audio/AC-3
audio encoder with multiplexer
SAA6752HS
7.8.4.3 DEBI slave mode
The SAA6752HS supports DEBI slave mode with a block
transfer of 8-bit data. This can be used for interfacing with
a PCI bridge (for example, an SAA7146A chip set). There
is no addressing phase necessary. The transfer starts with
recognition of a PDIDS pulse. The requested data,
PDO[7:0], is transferred when the PDOVAL signal goes
active, indicating that data is available in the output buffer.
In the event of interfacing to an SAA7146A chip set, the
PDOVAL pin is connected to the DTACK_RDY pin and
serves as a handshake. The LDS_RDN and UDS_WRN
signals should be used to generate the PDIDS signal.
Note that to operate correctly to the DEBI transfer protocol
the VALID output signal should be programmed negative
by I
2
C-bus command and a 3.3 kΩ resistor to V
DDP
is
recommended.
handbook, full pagewidth
MHC139
OUTPUT INTERFACE
SAA6752HS
DATA RECEIVER
(SAA7146A)
PDIOCLK
n.c.
n.c.
n.c.
PDOSYNC
PDOAV
PDO
[
7:0
]
PDOVAL
AD16IN
DTACK_RDY
LDS_RDN
UDS_WRN
PDIDS
Fig.12 DEBI slave mode protocol.
handbook, full pagewidth
MHC140
XX 01 XX 02
PDO
[
7:0
]
PDOVAL
PDIDS
Fig.13 Data transfer in DEBI slave mode.