Motorola DSP56301 - Manual (Page 128)

Data Transfer Paths
6 -10 DSP56301 User’s Manual
1 0 The three least significant PCI data bytes are written
to the HTXR. HD[15–0] are written to the HTXR, right aligned
and sign extended.
1 1 The three most significant PCI data bytes are written
to the HTXR. HD[15–0] are written to the HTXR, left aligned,
and zero filled.
Table 6-5. Receive Transfer Data Formats
HCTR DSP to Host Data Transfer Format
HRF
1
HRF
0
PCI mode Universal Bus mode
0 0 The two least significant bytes of two HRXS
locations are output. The three least significant HRXS bytes
are output to HD[23–0].
Table 6-4. Transmit Data Transfer Format (Continued)
HCTR Host-to-DSP Data Transfer Format
HTF1 HTF0 PCI mode Universal Bus mode
HDTFC
PCI bus
DRXR
HI32
GDB/MDDB
X
HTXR
HDTFC
Host bus
DRXR
HI32
GDB/MDDB S
S
HTXR
S
S
HDTFC
PCI bus
DRXR
HI32
GDB/MDDB
X
HTXR
HDTFC
Host bus
DRXR
HI32
GDB/MDDB $0
$0
HTXR
$0
$0
HDTFC
PCI bus
DTXS
HI32
GDB/MDDB
HRXS
X
X
X
HDTFC
Host bus
DTXS
HI32
GDB/MDDB
HRXS