Motorola DSP56301 - Manual (Page 129)

Data Transfer Paths
Host Interface (HI32) 6 -11
0 1 The three least significant HRXS bytes are output
right aligned and zero extended. The two least significant HRXS bytes are
output to HD[15–0].
1 0 The three least significant HRXS bytes are output
right aligned and sign extended. The two least significant HRXS bytes are
output to HD[15–0].
1 1 The three least significant HRXS bytes are output
left aligned and zero filled. The two middle HRXS bytes are output to
HD[15–0].
Table 6-5. Receive Transfer Data Formats
HCTR DSP to Host Data Transfer Format
HRF
1
HRF
0
PCI mode Universal Bus mode
HDTFC
PCI bus
DTXS
HI32
GDB/MDDB
$0
$0
HRXS
HDTFC
Host bus
DTXS
HI32
GDB/MDDB X
HRXS
X
X
HDTFC
PCI bus
DTXS
HI32
GDB/MDDB
S
S
HRXS
HDTFC
Host bus
DTXS
HI32
GDB/MDDB X
HRXS
X
X
HDTFC
PCI bus
DTXS
HI32
GDB/MDDB
$0
$0
HRXS
HDTFC
Host bus
DTXS
HI32
GDB/MDDB X
HRXS
X
X