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參數(shù)資料
| 型號： | 2K30A |
| 廠商： | Motorola, Inc. |
| 元件分類： | 數(shù)字信號處理 |
| 英文描述： | 16-bit fixed point DSP with Flash |
| 中文描述： | 具有閃存的 16 位定點 DSP |
| 文件頁數(shù)： | 18/21頁 |
| 文件大?。?/td> | 219K |
| 代理商： | 2K30A |
Chip Errata
DSP56301 Digital Signal Processor
Mask:2K30A
DSP56301 Errata
1996-2002, Motorola
For More Information On This Product,
Go to: www.freescale.com
ng 12/19/02 pg. 18
ED40
Description (added 11/ 11/ 99):
When an instruction with all the following conditions follows a
repeat instruction, then the last move will be corrupted.:
1. The repeated instruction is from external memory.
2. The repeated instruction is a DALU instruction that includes 2
DAL registers, one as a source, and one as destination (e.g. tfr, add).
3. The repeated instruction has a double move in parallel to the
DALU instruction: one move
’
s source is the destination of the
DALU instruction (causing a DALU interlock); the other move
’
s
destination is the source of the DALU instruction.
Example:
rep #number
tfr x0,a x(r0)+,x0 a,y0 ; This instruction is from external memory
|__|_________|------|----------> This is condition 3 second part.
|_____________|----------> This is condition 3, first part - DALU interlock
In this example, the second iteration before the last, the "x(r0)+,x0"
doesn
’
t happen. On the first iteration before the last, the X0 register
is fixed with the "x(r0)+,x0", but the "tfr x0,a" gets the wrong value
from the previous iteration
’
s X0. Thus, at the last iteration the A
register is fixed with "tfr x0,a", but the "a,y0" transfers the wrong
value from the previous iteration
’
s A register to Y0.
Workaround:
1. Use the DO instruction instead; mask any necessary interrupts
before the DO.
2. Run the REP instructions from internal memory.
3. Don
’
t make DALU interlocks in the repeated instruction. After
the repeat make the move. In the example above, all the "move
a,y0" are redundant so it can be done in the next instruction:
rep #number
tfr x0,a x(r0)+,x0
move a,y0
If no interrupts before the move is a must, mask the interrupts
before the REP.
Pertains to:
DSP56300 Family Manual,
Rev. 2, Section A.3,
“
Instruction Sequence Restrictions.
”
2K30A
Errata
Number
Document Update
Applies
to Mask
F
Freescale Semiconductor, Inc.
n
.
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