參數(shù)資料
型號(hào): SiI0680ACL144
廠商: Silicon Image, Inc.
英文描述: PCI to IDE/ATA
中文描述: PCI到IDE / ATA的
文件頁數(shù): 107/124頁
文件大小: 820K
代理商: SII0680ACL144
Silicon Image, Inc.
SiI0680A PCI to IDE/ATA
Data Sheet
2006 Silicon Image, Inc.
SiI-DS-0069-C
107
10.4 PLL TEST
10.4.1 BYPASSING the VCO
The VCO in the analog phase-locked loop must be bypassed during digital logic simulation, to allow direct control of the PLL
output clock. When PLL_CPBIAS is forced high the reference clock (PCI_CLK) is muxed to the PLL output. Automatic test
equipment at the foundry also requires this test functionality to run the digital test vectors.
10.4.2 TESTING the VCO
A divide-by-4K counter is used to measure the VCO frequency for any controlled voltage at the PLL_LOOPFLT pin.
2
2
3
PLL
0
1
&
1
0
&
4K
0
1
PCI_GNT_N
IDE0_DMARQ
PCI_CLK
TEST_MODE
BA5_EN
( FB Clock )
(Ref Clock)
(Test Clock)
PLL_TEST_MODE
SCAN_MODE
P_CLK
MEM_CS_N
Normal Function
33 MHz
&
PCI_IDSEL
&
PLL_TEST_CLK_SEL
RST_PLL_TEST
&
PLL_CPBIAS
Figure 10-4: PLL Test Logic
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