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Infineon Technologies TC1796 User Manual

Infineon Technologies TC1796
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TC1796
System Units (Vol. 1 of 2)
Peripheral Control Processor (PCP)
User’s Manual 11-116 V2.0, 2007-07
PCP, V2.0
11.12.6 Case-like Code Switches (Computed Go-To)
The JC.I instruction can be used to implement a multi-way branch for branch-on-bit or
branch-on-state conditional branches. This instruction allows a conditional relative jump
based on an index held in a register. If this instruction is combined with a table of jump
addresses, a switch-type statement can be implemented. The default case, that is when
the condition code = False, is the next instruction, as is the jump with register index = 0.
The table can be any arbitrary length. The index register should be checked for range
before the jump into the table is performed.
For Example:
COMP R3,#5 ;compare R3 to #5 - the number of
;entries in the table
JC.I R3,cc_ULE
DEFAULT: JL #case_0 ;destination if R3 = 0 or
;condition = false
JL #case_1 ;destination if R3 = 1
JL #case_2 ;destination if R3 = 2
JL #case_3 ;destination if R3 = 3
JL #case_4 ;destination if R3 = 4
JL #case_5 ;destination if R3 = 5
11.12.7 Simple DMA Operation
A simple interrupt-driven DMA requires at least the Small Context Model to operate
properly. Its operation is comprised of three stages:
The device interrupts the PCP to indicate it can receive or provide data.
The PCP moves the amount of data it is programmed to move.
The PCP eventually finishes and interrupts the CPU to notify it that the DMA is
complete.
There are two options for implementing a simple DMA operation, copy and burst copy.
11.12.7.1 COPY Instruction
A simple DMA channel program can consist of just two instructions. In the example
below, a device interrupts the PCP to notify it that it has data in its output buffer, which
is 4 words deep. The COPY instruction copies 4 words to memory at a time. It
decrements CNT1 (which is initialized by the CPU in CR6_CNT1 context) after each 4
word transfer. The EXIT command then executes, and if CNT1 was decremented to 0,
the condition code causes it to issue an interrupt with the value held R6_SRPN.
COPY DST+,SRC,CNC=1,BRST=4,SIZE=32 ;do peripheral -> memory DMA
EXIT EC=0,ST=0,INT=1,EP=0,cc_CNZ ;transfer done, so exit

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Infineon Technologies TC1796 Specifications

General IconGeneral
BrandInfineon Technologies
ModelTC1796
CategoryController
LanguageEnglish