DSPIC33FJ64GS406 Microchip Technology Inc., DSPIC33FJ64GS406 Datasheet - Page 103
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DSPIC33FJ64GS406
Manufacturer Part Number
DSPIC33FJ64GS406
Description
High-performance, 16-bit Digital Signal Controllers
Manufacturer
Microchip Technology Inc.
Datasheet
1.DSPIC33FJ64GS406.pdf
(418 pages)
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4.4.3
Modulo Addressing can be applied to the Effective
Address (EA) calculation associated with any W
register. Address boundaries check for addresses
equal to:
• The upper boundary addresses for incrementing
• The lower boundary addresses for decrementing
It is important to realize that the address boundaries
check for addresses less than or greater than the upper
(for incrementing buffers) and lower (for decrementing
buffers) boundary addresses (not just equal to).
Address changes can, therefore, jump beyond
boundaries and still be adjusted correctly.
4.5
Bit-Reversed Addressing mode is intended to simplify
data re-ordering for radix-2 FFT algorithms. It is
supported by the X AGU for data writes only.
The modifier, which can be a constant value or register
contents, is regarded as having its bit order reversed. The
address source and destination are kept in normal order.
Thus, the only operand requiring reversal is the modifier.
4.5.1
Bit-Reversed Addressing mode is enabled in any of
these situations:
• BWM bits (W register selection) in the MODCON
• The BREN bit is set in the XBREV register
• The addressing mode used is Register Indirect
2010 Microchip Technology Inc.
buffers
buffers
Note:
register are any value other than ‘15’ (the stack
cannot be accessed using Bit-Reversed
Addressing)
with Pre-Increment or Post-Increment
dsPIC33FJ32GS406/606/608/610 and dsPIC33FJ64GS406/606/608/610
Bit-Reversed Addressing
MODULO ADDRESSING
APPLICABILITY
The modulo corrected effective address is
written back to the register only when
Pre-Modify or Post-Modify Addressing
mode is used to compute the effective
address. When an address offset (such as
[W7 + W2]) is used, Modulo Address
correction is performed but the contents of
the register remain unchanged.
BIT-REVERSED ADDRESSING
IMPLEMENTATION
Preliminary
If the length of a bit-reversed buffer is M = 2
the last ‘N’ bits of the data buffer start address must
be zeros.
XB<14:0> is the Bit-Reversed Address modifier, or
‘pivot point,’ which is typically a constant. In the case of
an FFT computation, its value is equal to half of the FFT
data buffer size.
When enabled, Bit-Reversed Addressing is executed
only for Register Indirect with Pre-Increment or
Post-Increment Addressing and word-sized data
writes. It will not function for any other addressing
mode or for byte-sized data, and normal addresses are
generated instead. When Bit-Reversed Addressing is
active, the W Address Pointer is always added to the
address modifier (XB), and the offset associated with
the Register Indirect Addressing mode is ignored. In
addition, as word-sized data is a requirement, the LSb
of the EA is ignored (and always clear).
If Bit-Reversed Addressing has already been enabled
by setting the BREN (XBREV<15>) bit, a write to the
XBREV register should not be immediately followed by
an indirect read operation using the W register that has
been designated as the bit-reversed pointer.
Note:
Note:
All bit-reversed EA calculations assume
word-sized data (LSb of every EA is
always clear). The XB value is scaled
accordingly to generate compatible (byte)
addresses.
Modulo Addressing and Bit-Reversed
Addressing
together. If an application attempts to do so,
Bit-Reversed Addressing will assume
priority when active for the X WAGU and X
WAGU, Modulo Addressing will be dis-
abled. However, Modulo Addressing will
continue to function in the X RAGU.
should
not
DS70591C-page 103
be
enabled
N
bytes,
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