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KC705 Evaluation Board
21
UG810 (v1.3) May 10, 2013
Feature Descriptions
The KC705 board includes a secure digital input/output (SDIO) interface to provide
user-logic access to general purpose non-volatile SDIO memory cards and peripherals. The
SD card slot is designed to support 50 MHz high speed SD cards.
The SDIO signals are connected to I/O bank 12 which has its VCCO set to VADJ. A Texas
Instruments I TXB0108 8-bit bidirectional voltage-level translator is used between the
FPGA and the SD card connector (U9).
shows the connections of the SD card
interface on the KC705 board.
lists the SD card interface connections to the FPGA.
X-Ref Target - Figure 1-7
Figure 1-7:
SD card interface
UG810_c1_06_120111
TXB0108
Voltage-Level
Translator
U57
A7
A6
A5
A4
A3
A2
A1
VCCA
B7
B6
B5
B4
B3
B2
B1
VCCB
A8
B8
OE
GND
SDIO Card
Connector
U9
DETECT
DAT2
DAT1
DAT0
CLK
CMD
CD_DAT3
VDD
PROTECT
GNDTAB2
VSS1
GNDTAB1
VSS2
GND
GND
SDIO_SDWP
11
SDIO_SDDET
10
SDIO_DAT2
9
SDIO_DAT1
8
SDIO_DAT0
7
SDIO_CLK
5
SDIO_CMD
1
SDIO_CD_DAT3
VCC3V3
C22
0.1
μ
F 25V
X5R
GND
4
6
3
D_P
NC
12
GNDTAB3
GNDTAB4
IOGND1
IOGND2
15
16
17
18
13
14
51.1K 1% Six Places
VCC3V3
R457
R458
R455
R456
R453
R454
2
VADJ
C543
0.1
μ
F 25V
X5R
GND
GND
VCC3V3
C22
0.1
μ
F 25V
X5R
GND
SDIO_DAT2_LS
SDIO_DAT1_LS
SDIO_DAT0_LS
SDIO_CLK_LS
SDIO_CMD_LS
SDIO_CD_DAT3_LS
51.1K 1% Six Places
R451
R452
R449
R450
R447
R448
NC
NC
VADJ
R35
R34
4.7K
4.7K
To FPGA
Bank 12
(U1)
To FPGA
Bank 12
(U1)
Table 1-7:
SDIO Connections to the FPGA
U1 FPGA Pin
Name
Schematic Net Name
U57 Level Shifter
U9 SDIO Connector
Pin Name (A)
Pin Name (B)
Pin Number
Pin Name
Y21
SDIO_SDWP
N/A
N/A
11
SDWP
AA21
SDIO_SDDET
N/A
N/A
10
SDDET
AB22
SDIO_CMD_LS
A5
B6
2
CMD
AB23
SDIO_CLK_LS
A6
B7
5
CLK
AA22
SDIO_DAT2_LS
A3
B4
9
DAT2
AA23
SDIO_DAT1_LS
A2
B3
8
DAT1
AC20
SDIO_DAT0_LS
A1
B1
7
DAT0
AC21
SDIO_CD_DAT3_LS
A4
B5
1
CD_DAT3