Data Type - Analog Devices ADSP-21261 SHARC Hardware Reference Manual

(unpacking) operations. Companding can be used when word packing or
unpacking is being used.
When serial port data packing is enabled, the transmit and receive inter-
rupts are generated for the 32-bit packed words, not for each 16-bit word.

When 16-bit received data is packed into 32-bit words and stored
in normal word space in processor internal memory, the 16-bit
words can be read or written with short word space addresses.

Data Type

The field of the
DTYPE
formats (for non-multichannel operation) shown in
field is reserved for I
selected for primary A channel, the secondary B channel performs a
zero-fill.

In Multichannel mode, channel B looks at
If
DTYPE[0]
If
DTYPE[0]
Table 9-3. DTYPE and Data Formatting (DSP Serial Mode)
DTYPE Data Formatting
00
01
10
11
ADSP-2126x SHARC Processor Hardware Reference
Control registers specifies one of four data
SPCTLx
2
S mode. In DSP Serial mode, if companding is
= 1 sign-extend
= 0 zero-fill
Right-justify, zero-fill unused MSBs
Right-justify, sign-extend into unused MSBs
Compand using -law (primary A channels only)
Compand using A-law (primary A channels only)
Serial Ports
Table 9-3. This bit
only.
XDTYPE[0]
9-41