User manual

The FT2232HQ is also used as the controller for the Digilent USB-JTAG circuitry, but the USB-
UART and USB-JTAG functions behave entirely independent of one another. Programmers
interested in using the UART functionality of the FT2232 within their design do not need to
worry about the JTAG circuitry interfering with the UART data transfers, and vice-versa. The
combination of these two features into a single device allows the Arty Z7 to be programmed,
communicated with via UART, and powered from a computer attached with a single Micro USB
cable.
The DTR signal from the UART controller on the FT2232HQ is connected to MIO12 of the
Zynq device via JP1. Should the Arduino IDE be ported to work with the Arty Z7, this jumper
can be shorted and MIO12 could be used to place the Arty Z7 in a “ready to receive a new
sketch” state. This would mimic the behavior of typical Arduino IDE boot-loaders.
7 microSD Slot
The Arty Z7 provides a microSD slot (J9) for non-volatile external memory storage as well as
booting the Zynq. The slot is wired to Bank 1/501 MIO[40-47], including Card Detect. On the
PS side peripheral SDIO 0 is mapped out to these pins and controls communication with the SD
card. The pinout can be seen in Table 7.1. The peripheral controller supports 1-bit and 4-bit SD
transfer modes, but does not support SPI mode. Based on the Zynq Technical Reference manual,
SDIO host mode is the only mode supported.
Signal Name Description Zynq Pin SD Slot Pin
SD_D0
Data[0] MIO42 7
SD_D1
Data[1] MIO43 8
SD_D2
Data[2] MIO44 1
SD_D3
Data[3] MIO45 2
SD_CCLK
Clock MIO40 5
SD_CMD
Command MIO41 3
SD_CD
Card Detect MIO47 9
Table 7.1. microSD pinout
The SD slot is a powered from 3.3V, but is connected through MIO Bank 1/501 (1.8V).
Therefore, a TI TXS02612 level shifter performs this translation. The TXS02612 is actually 2-
port SDIO port expander, but only its level shifter function is used. The connection diagram can
be seen on Figure 7.1. Mapping out the correct pins and configuring the interface is handled by
the Arty Z7 Zynq presets file, available on the Arty Z7 Resource Center.