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VSC7440 데이터시트(PDF) 355 Page - Microsemi Corporation

부품명 VSC7440
상세설명  L2/L3 Enterprise Gigabit Ethernet Switch with 10 Gbps Links
PDF  444 Pages
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제조업체  MICROSEMI [Microsemi Corporation]
홈페이지  http://www.microsemi.com
Logo MICROSEMI - Microsemi Corporation

VSC7440 데이터시트(HTML) 355 Page - Microsemi Corporation

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VCore-III System and CPU Interfaces
VMDS-10492 VSC7440 Datasheet Revision 4.2
338
Figure 118 •
SIMC SPI Clock Configurations
Data is sampled in the middle of the data-eye.
When using SPI protocol and transferring more than one data frame at the time, the controller performs
one consecutive transfer. The following illustration shows a transfer of three data frames of 4 bits each.
Note: Transmitting transfers end when the transmit FIFO runs out of data frames. Receive only transfers end
when the pre-defined number of data-frames is read from the SI interface.
Figure 119 •
SIMC SPI 3x Transfers
4.8.2.2
SSP Protocol
The SSP protocol for transferring two 6-bit data frames is shown in the following illustration. When using
SSP mode, CTRLR0.SCPH and CTRLR0.SCPOL must remain zero.
SI_nCS0
SI_CLK
SI_DO
SI_DI
75
4
3
2
1
0
CTRLR0.SCPH = 0, CTRLR0.SCPOL = 0
6
SI_nCS0
SI_CLK
SI_DO
SI_DI
75
4
3
2
1
0
CTRLR0.SCPH = 1, CTRLR0.SCPOL = 0
6
SI_nCS0
SI_CLK
SI_DO
SI_DI
75
4
3
2
1
0
CTRLR0.SCPH = 1, CTRLR0.SCPOL = 1
6
SI_nCS0
SI_CLK
SI_DO
SI_DI
75
4
3
2
1
0
CTRLR0.SCPH = 0, CTRLR0.SCPOL = 1
6
75
4
3
2
1
0
6
75
4
3
2
1
0
6
75
4
3
2
1
0
6
75
4
3
2
1
0
6
SI_nCS0
SI_CLK
SI_DO
SI_DI
3
1
0
3
210
First frame
2
3
1
0
3
210
2
32
10
32
10
Second frame
Third frame



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