Nvidia Jetson TX2 Manual page 57

Drive Type
F (CLK base frequency)
MAX
C (C +C )
LOAD CARD EQ
(CLK freq = 208MHz)
C (C +C )
LOAD CARD EQ
(CLK freq = 100/50/25MHz)
Table 56. SDCARD Signal Connections
Function Signal Name
SDCARD_CLK
SDCARD_CMD
SDCARD_D[3:0]
SDCARD_CD#
SDCARD_WP
SDIO_RST#
SDCARD_PWR_EN
EMI/ESD may be required for SDIO when used as the SD Card socket interface. Any EMI/ESD device used must be able to meet signal
Note:
timing/quality requirements. The Carrier Board implements 10Ω series resistors on the SDCARD data lines and a 0Ω series resistor on the
clock line (for possible tuning if required).
Table 57. SDIO Signal Connections (Jetson TX2i only)
Function Signal Name
SDIO_CLK
SDIO_CMD
SDIO_D[3:0]
SDIO_RST#
Table 58. Recommended SDCARD/SDIO observation (test) points for initial boards
Test Points Recommended
One for SDCARD/SDIO_CLK line.
One SDCARD/SDIO_DATx line & one for
SDCARD/SDIO_CMD.
JETSON TX2/TX2i OEM PRODUCT | DESIGN GUIDE | 20180618
A
B
C
D
SDR104
DDR50
SDR50
SDR25
SDR12
HS
DS
Drive Type = A
Drive Type = B
Drive Type = C
Drive Type = D
Drive Type = A
Drive Type = B
Drive Type = C
Drive Type = D
Type Termination
O 120 Ω bead on module
for SDCARD_CLK. 0Ω
series resistor on carrier
board as placeholder.
See note for EMI/ESD
I/O 10Ω series resistors for
SDCARD CMD/D[3:0].
I/O
See note for EMI/ESD
I
I
O
O
Type Termination
O 120 Ω bead on module
for SDCARD_CLK. See
note for EMI/ESD
I/O
See note for EMI/ESD
I/O
O
Location
Near Device/Connector pin. SD connector pin can be used for device end if accessible.
Near the module & Device pins. SD connector pin can be used for device end if accessible.
33 Ω UHS50 Card = optional, UHS104 Card = mandatory
50 Ω UHS50 Card = mandatory, UHS104 Card = mandatory
66 Ω UHS50 Card = optional, UHS104 Card = mandatory
100 Ω UHS50 Card = optional, UHS104 Card = mandatory
208 MHz Single data rate up to 104MB/sec
50 MHz Double data rate up to 50MB/sec
100 MHz Single data rate up to 50MB/sec
50 MHz Single data rate up to 25MB/sec
25 MHz Single data rate up to 12.5MB/sec
50 MHz Single data rate up to 25MB/sec
25 MHz Single data rate up to 12.5MB/sec
21 pF Total load capacitance supported
15 pF Total load capacitance supported
11 pF Total load capacitance supported
22 pF Possibly 22pF+ depending on host system
43 pF Total load capacitance supported
30 pF Total load capacitance supported
23 pF Total load capacitance supported
22 pF Possibly 22pF+ depending on host system
Description
SDIO/SD Card Clock: Connect to CLK pin of device or socket
SDIO/SD Card Command: Connect to CMD pin of device/socket
SDIO/SD Card Data: Connect to Data pins of device or socket
SD Card Card Detect: Connect to CD/C_DETECT pin on socket if required.
SD Card Write Protect: Connect to WP/WR_PROTECT pin on socket if
required.
SDIO Reset: Connect to reset line on SDIO peripheral/connector.
SD Card Supply/Load Switch Enable: Connect to enable of supply/load switch
supplying VDD on SD Card socket.
Description
SDIO/SD Card Clock: Connect to CLK pin of device or socket
SDIO/SDMMC Command: Connect to CMD pin of device/socket
SDIO/SDMMC Data: Connect to Data pins of device or socket
SDIO Reset: Connect to reset line on SDIO peripheral/connector.
NVIDIA Jetson TX2/TX2i OEM Product Design Guide
57