參數(shù)資料
型號: A42MX16-3VQ100B
廠商: Electronic Theatre Controls, Inc.
英文描述: 40MX and 42MX FPGA Families
中文描述: 40MX和42MX FPGA系列
文件頁數(shù): 29/120頁
文件大小: 854K
代理商: A42MX16-3VQ100B
16
4958B–AUTO–11/10
Atmel ATA6285/ATA6286 [Preliminary]
3.5.6
Instruction Execution Timing
This section describes the general access timing concepts for instruction execution. The Atmel
AVR CPU is driven by the CPU clock, CLK
CPU, directly generated from the selected clock
source for the chip. No internal clock division is used.
Figure 3-5 shows the parallel instruction fetches and instruction executions enabled by the Har-
vard architecture and the fast-access Register File concept. This is the basic pipelining concept
to obtain up to 1MIPS per MHz with the corresponding unique results for functions per cost,
functions per clocks, and functions per power-unit.
Figure 3-5.
The Parallel Instruction Fetches and Instruction Executions
Figure 3-6 shows the internal timing concept for the Register File. In a single clock cycle an ALU
operation using two register operands is executed, and the result is stored back to the destina-
tion register.
Figure 3-6.
Single Cycle ALU Operation
Bit
15
14
13
12
11
10
9
8
SP15
SP14
SP13
SP12
SP11
SP10
SP9
SP8
SPH
SP7
SP6
SP5
SP4
SP3
SP2
SP1
SP0
SPL
Bit
765
432
10
Read/Write
R/WR/W
Initial Value RAMEND RAMEND RAMEND RAMEND RAMEND RAMEND RAMEND RAMEND
RAMEND RAMEND RAMEND RAMEND RAMEND RAMEND RAMEND RAMEND
clkCPU
T1
1st Instruction Fetch
2nd Instruction Fetch
3rd Instruction Fetch
4th Instruction Fetch
2nd Instruction Fetch
3rd Instruction Fetch
T2
T3
T4
clkCPU
T1
Register Operands Fetch
Result Write Back
ALU Operation Execute
Total Execution Time
T2
T3
T4
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