mpc823rg Freescale Semiconductor, Inc, mpc823rg Datasheet - Page 1208

• Manufacturer Part Number: mpc823rg
• Description: Mpc823 Powerquicc Integrated Communications Processor For Portable Systems
• Manufacturer: Freescale Semiconductor, Inc

ecowx
Assembler Syntax
Definition
Operation
Description
FIELD
FIELD
BIT
BIT
16
0
17
1
18
B
2
Freescale Semiconductor, Inc.
31
For More Information On This Product,
19
3
else
EA
paddr
send store word request for paddr to device identified by
EAR[RID]
send rS to device
when mapping special devices such as graphics devices that
use addresses as pointers.
EA is the sum (rA|0) + (rB). A store word request for the physical
address corresponding to EA and the contents of rS are sent to
the device identified by EAR[RID], bypassing the cache. EAR[E]
must be 1, if it is not, a DSI exception is generated. EA must be
a multiple of four. If it is not, one of the following occurs:
•
•
The ecowx instruction is supported for effective addresses that
reference memory segments in which SR[T] = 0, and for EAs
mapped by the DBAT registers. If the EA references a direct-
store segment (SR[T] = 1), either a DSI exception occurs or the
results are boundedly undefined. However, note that the direct-
store facility is being phased out of the architecture and will not
likely be supported in future devices. Thus, software must not
depend on its effects.
ecowx
External Control Out Word Indexed
if rA = 0 then b
The ecowx instruction and the EAR register can be very efficient
•
A system alignment exception is generated.
A DSI exception is generated (possible only if EAR[E] = 0).
The results are boundedly undefined.
20
MPC823 REFERENCE MANUAL
4
b + (rB)
Go to: www.freescale.com
b
21
address translation of EA
5
(rA)
rS,rA,rB
22
6
0
23
7
24
S
8
25
9
438
10
26
MPC823 Instruction Set—ecowx
11
27
12
28
13
29
A
14
30
B-55
15
31
0