The SDIO signals are connected to ZU67DR RFSoC PS bank 501 which has its VCCMIO set to
1.8V. The SD interface nets MIO[46:49]_SDIO_DAT[0:3], MIO50_SDIO_CMD, and
MIO51_SDIO_CLK each have a series 30Ω resistor at the Bank 501 source. An NXP
NVT4857UK SD 3.0-compliant voltage level-translator U23 is present between the ZU67DR
RFSoC and the SD card connector (J23). The NXP NVT4857UK U23 device provides SD3.0
capability with SDR104 performance.
The following figure shows the connections of the SD card interface on the ZCU670 board.
Figure 11: SD Card Interface
X25730-091021
The NXP SD3.0 level shifter is mounted on an X-SDM-01 interposer board that has the pin
mapping shown in the following table.
Table 15: NVT4857UK U23 Adapter Pinout
Adapter Pin Number
NVT4857UKAZ Pin Number
NVT4857UKAZ Pin Name
1
D2
CLKA
2
C3, C2
GND
3
B2
CD
4
C1
CMDA
5
E2
CLK_FB
6
Unused
Unused
Chapter 3: Board Component Descriptions
UG1532 (v1.0) March 30, 2022
ZCU670 Board User Guide
36