參數(shù)資料
型號(hào): CTMRM
英文描述: Configurable Timer Module Reference Manual
中文描述: 配置定時(shí)器模塊參考手冊
文件頁數(shù): 38/164頁
文件大?。?/td> 1148K
代理商: CTMRM
MOTOROLA
3-2
CTM
REFERENCE
INTERRUPTS
3
3.2
Arbitration
The interrupt and exception processing system on IMB family devices is very similar to that used
in the M68000 microprocessor family architecture, and is designed to support a very large number
of interrupt sources. Within each of the eight interrupt request levels, defined by IL[2:0], there are
sixteen different arbitration priority levels, defined by IARB[3:0], available to each IMB module.
Level 15 is the highest arbitration priority level and level 1 is the lowest. Level 0 is a special case
and is treated by the CPU as a spurious interrupt. Interrupting modules present their arbitration ID
(IARB[3:0]) on the IMB and the module with the highest ID wins.
Note:
Simultaneous interrupts on the same interrupt level are arbitrated on the basis of the
four arbitration bits IARB[3:0]. Consequently, no two IMB modules may have the same
IARB field value.
In the CTM, IARB[2:0] are contained within the BIUSM module configuration register (BIUMCR)
and are common to all the CTM submodules, and each CTM submodule contains its own IL[2:0]
and IARB3 bits. This allows each CTM submodule to request interrupts with one of two arbitration
levels on any one of the 8 available interrupt levels. For example, if the IARB[2:0] bits in the
BIUMCR are set to 101, each submodule can have an arbitration priority level of 0101 (5) or 1101
(13), depending on the state of the IARB3 bit.
3.3
CTM daisy-chain priority
To allow resolution between CTM submodule interrupts on the same interrupt level (IL[2:0]) and
with the same arbitration priority (IARB3), the six hardwired vector bits (VECT[5:0]) in each
submodule provide a hardware system of priority, or daisy-chain, within the CTM. The submodules
are daisy-chained in descending order of their vector numbers, i.e. submodule 0 has the highest
position in the daisy-chain and will win over all other submodules generating simultaneous
interrupts on the same level with the same arbitration. The position of each submodule in the
daisy-chain is specific to each different CTM variant. This is shown generically in Table 3-1. For an
example of the daisy-chain structure of a specific CTM implementation, CTM2, see Appendix B.
F
.
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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