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GHI Electronics,LLC USBwiz User Manual
Pin-Out and Description
3. Pin-Out and Description
The following table includes brief description about USBwiz chip pinouts:
Pin Name Description
1 UH_RD# Read strobe. Used for USB host chip (must have a pull-up
resistor on this pin or UH_CS#)
2 UH_WR# Write strobe. Used for USB host chip
3 RTXC1 32KHz crystal for RTC
4 D11 Data line 11. Used for USB host chip
5 RTXC2 32KHz crystal for RTC
6 VSS Connect to ground
7 V3A Analog supply source 3.3V
8 D10 Data line 10. Used for USB host chip.
9 MISC For future expansion
10 UH_RESET# Reset pin. Used for USB host chip.
11 A0 A0. Used for USB host chip
12 D9 Data line 9. Used for USB host chip
13 ACTIVITY_LED Goes high when executing a command and low when
finished.
14 MISC1 Currently not used
15 SD_DET SD card detect. Edge sensitive signal.
16 D8 Data line 8. Used for USB host chip.
17 SD_CS# Chip select line for MMC or SD card
18 VSS Connect to ground
19 UART_TX
SPI_DATARDY
I2C_DATARDY
In UART mode this is the transmit pin
In SPI and I2C modes, this flag indicates that USBwiz has
data ready in SPI or I2C buffer and the master must read
it. USBwiz will ignore any incoming command when this
pin is high.
20 TRST# Leave Unconnected
21 UART_RX
SPI_BUSY
I2C_BUSY
In UART mode this is the data receive pin
In SPI and I2C modes, this pin is a flag that indicates that
USBwiz is busy and it will not accept any commands
Rev.2.27 Page 10 of 64 www.ghielectronics.com
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