STPCI2 データシートの表示（PDF） - STMicroelectronics
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STPCI2 Datasheet PDF : 108 Pages
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STPC® ATLAS
3.1.5 CPUCLK/HCKL DESKEW PROGRAMMING 3.2 TYPICAL STRAP OPTION
IMPLEMENTATION
MD[45]
1
0
MD[46]
Description
0
HCLK between 33MHz and
64MHz
1
HCLK between 64MHz and
133MHz
All other settings are reserved
Table 3-1.shows the detailed Strap options
required to boot the STPC in ISA mode with a Host
Clock Frequency of 66MHz in X2 mode with
internal keyboard/mouse, UARTS and parallel port
enabled.
Note that these straps are not accessible by
software.
Table 3-1. Typical Strap Option Implementation
Signal
MD1
) MD2
t(s MD3
c MD[4]
u MD[5]
d MD[6]
ro MD[7]
P MD[8]
te MD[9]
le MD10
o MD11
s MD14
b MD15
O MD16
- MD17
t(s) MD18
MD19
c MD20
du MD21
ro MD23
P MD24
MD25
te MD26
le MD27
soMD28
b MD29
O MD30
Designation
Reserved2
HCLK Speed
PCI_CLKO Divisor
MCLK Synchro (see Section 3.1.1. )
PCI_CLKO Programming
ISA / PCMCIA / Local Bus
Reserved2
Reserved2
CPU clock Multiplication
Reserved2
Reserved2
PCI_CLKO Divisor
HCLK Pad Direction
MCLK Pad Direction
DCLK Pad Direction
Reserved2
Reserved2
HCLK PLL Speed
Reserved2
Reserved2
Reserved2
Reserved2
Actual
Settings
Pull Up
Pull down
Pull down
Pull up
Pull down
Pull up
Pull down
Pull down
Pull down
Pull down
Pull down
Pull up
Pull up
Pull up
Pull up
Pull up
Pull up
Pull up
Pull up
Pull up
Pull up
Pull up
Pull down
Pull up
Pull up
Pull up
Pull up
Description
-
HCLK = 66MHz
PCICLK = HCLK/2
Asynchronous
PCICLK PLL Window =
32MHz - 64MHz
ISA Mode
-
-
X2 Mode
-
-
PCICLK = HCLK/2
Output
Output
Output
-
-
HCLK = 66MHz
-
-
-
-
MD31
Reserved2
Pull up
MD32
Reserved2
Pull up
MD33
Reserved2
Pull up
MD34
Reserved2
Pull up
Note1: Strap options on TC/PA[3] and DACK_ENC[2:0]/PA[2:0] are required for all the STPC Atlas Configurations (ISA,
PCMCIA, Local Bus).
Note2: Must be implemented.
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