參數(shù)資料
型號: IBM25405GP-3BA200C2
元件分類: 微控制器/微處理器
英文描述: RISC PROCESSOR, PBGA456
封裝: PLASTIC, BGA-456
文件頁數(shù): 41/48頁
文件大?。?/td> 649K
代理商: IBM25405GP-3BA200C2
PowerPC 405GP Embedded Controller
Data Sheet
Advance Information
IBM Corporation. All rights reserved.
Use is further subject to the provisions at the end of this document.
Page 46 of 48
galdsh5f
06/15/99 Preliminary
Strapping
While the SysReset input pin is low (system reset), the state of certain I/O pins is read to enable default initial
conditions prior to PPC405GP start-up. The actual capture instant is the nearest reference clock edge before
the deassertion of reset. These pins must be strapped using external pull-up (1) or pull-down (0) resistors to
select the desired default conditions. The following table lists the strapping pins along with their functions and
strapping options:
Package Thermal Characteristics
Characteristic
Symbol
Value
Unit
Notes
PBGA junction-to-ambient thermal resistance (typical) in convection
environment
θ
JA
19
°C/W
Strapping Pin Assignments
Function
Option
Ball Strapping
PLL Tuning
(use choice 2 if M <= 6)
(use choice 4 if M > 6)
AF3
AF2
AD16
Choice 1
0
Choice 2
0
1
Choice 3
0
1
0
Choice 4
0
1
Choice 5
1
0
Choice 6
1
0
1
Choice 7
1
0
Choice 8
1
PLL Forward Divider
D16
B15
Bypass mode
0
Divide by 3
0
1
Divide by 4
1
0
Divide by 6
1
PLL Feedback Divider
B14
C12
Divide by 1
0
Divide by 2
0
1
Divide by 3
1
0
Divide by 4
1
PLB Divider from CPU
P25
L24
Divide by 1
0
Divide by 2
0
1
Divide by 3
1
0
Divide by 4
1
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