參數(shù)資料
型號(hào)： YKNIFEX4HW
英文描述： IC APEX 20KE FPGA 100K
中文描述： 耶洛奈夫參考平臺(tái)硬件設(shè)計(jì)手冊(cè)
文件頁(yè)數(shù)： 14/24頁(yè)
文件大?。?/td> 186K
代理商： YKNIFEX4HW
Yellowknife X4 Hardware Reference Manual
Page 20 /22
Motorola Inc.
Unrestricted Distribution Permitted
98 Feb 20
4.2 Permanent Jumpers
Permanent jumpers are implemented with zero-ohm resistors permanently soldered to the
motherboard to select certain congurations. To change these settings, these resistors
must be added, changed or removed. This is no normally done by the end-user.
4.2.1 Processor Drive Strength
These resistors are used to modify the drive strength of the processor. The standard setting
is “Normal” mode. Higher drive strengths can clear some problems but could cause oth-
ers.
4.2.2 Map Selection
This resistor is used to select the memory map used by the MPC106. The default is “Map
B” for CHRP compatibility.
4.2.3 Cache Size Selection
These jumpers are used to set the size of the cache installed. Because the cache SRAM is
soldered directly to the motherboard, changing the cache size is an involved operation.
Still, for completeness, here are the settings.
Table 10: CPU Drive Strength
R14
DS0
R38
DS1
Meaning
IN
CPU is tri-stated
IN
out
1X : Normal drive strength
out
IN
1.5X : Strong drive strength
out
2X : Herculean drive strength
Table 11: Map Selection
R10
Meaning
IN
Map “B”: CHRP
out
Map “A”: PREP
Table 12: Cache Size Conguration
R350
CRB
R351
CRA
R352
CRB
Cache
Size
out
IN
out
256K
IN
out
IN
512K
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