Page History
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- SC to HD-IO Bank Interface
- I²C Backplane interface
- I²C System Control interface
- Power control
- Power status
- FAN Control
- FAN Status
- Power status indication
Firmware Revision and supported PCB Revision
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| SC I/O # | Function | FPGA IO | |
| IO1 | SCL OUT | G18 | |
| IO2 | SCL IN | G19 | |
| IO3 | SDA OUT | K18 | |
| IO4 | SDA IN | H19 | |
| IO5 | User LED | J17 | Drive SC LED, if configured in "Control Register" |
| IO6 | - | H17 | |
| IO7 | - | H18 | |
| IO8 | - | L18 | |
| IO9 | - | L17 | |
| IO10 | - | K17 |
I²C Interface
To use SC I²C interface corresponding connection should be configured in the FPGA project. There are 2 standard I²C interface controllers, which can be used AXI_IIC or Zynq UltraScale+ MPSoC integrated I²C controller.
AXI_IIC
Zynq UltraScale+ MPSoC integrated I²C controller
With this configuration, I²C with address 0x20 should be visible on I²C bus
This device is an emulation of TCA6416 I²C GPIO Chip. GPIO input and output pins are used to get status and control system.
| Address | Register | Description |
|---|---|---|
| 0 | Input Port 0 | Power status register: Bit 0 - LP_PGOOD Bit 1 - PG_PL Bit 2 - PG_PSGT Bit 3 - PG_GT_L Bit 4 - PG_GT_R Bit 5 - PG_DDR Bit 6 - Not Used "0" Bit 7 - Not Used "0" |
| 1 | Input Port 1 | FAN Status register Bits 7:0 - FAN RPM/1000 (Nominal Sepa HFB44B-12A speed is 8000 RPM) |
| 2 | Output Port 0 | Control register 0 Bits 1:0 - LED Control (Default "01") Bit 2 - SMB Strong Pull-Up Enable (Default "1") Bit 3 - Enable DAC1 Power (Default "1") Bit 4 - Enable DAC2 Power (Default "1") Bit 5 - Enable DAC3 Power (Default "1") Bit 6 - Enable DAC4 Power (Default "1") Bit 7 - Enable FPD Power (Default "1") |
| 3 | Output Port 1 | Control register 1 Bit 0 - Enable LPD Power (Default "1") Bit 1 - Enable DDR Power (Default "1") Bit 2 - Enable PSGT Power (Default "1") Bit 3 - Enable GT_L Power (Default "1") Bit 4 - Enable GT_R Power (Default "1") Bit 5 - Enable FAN Power (Default "1") (Works only if 4-wire FAN is used) Bit 6 - Not used Bit 7 - Not used |
I²C GPIO registers can be operated with directly, using Linux i2cset and i2cget commands
| Code Block |
|---|
root@petalinux:~# # Disable LED4
root@petalinux:~# i2cset -y 0 0x20 2 0xFC
root@petalinux:~# # Get Power status
root@petalinux:~# i2cget -y 0 0x20 0 b
0x3f
root@petalinux:~# # Get FAN RPM/1000
root@petalinux:~# i2cget -y 0 0x20 1 b
0x08 |
or I²C GPIO device driver can be instantiate in Linux device tree (project-spec/meta-user/recipes-bsp/device-tree/files/system-user.dtsi).
| Code Block |
|---|
&i2c0 {
tca6416: tca6416@21 {
compatible = "ti,tca6416";
reg = <0x20>;
gpio-controller;
#gpio-cells = <2>;
};
}; |
Appx. A: Change History and Legal Notices
Revision Changes
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RE02 to REV03
- Add I²C GPIO core
- FAN Control/FAN Status
- Power control
Document Change History
To get content of older revision got to "Change History" of this page and select older document revision number.
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| Date | Document Revision | CPLD Firmware Revision | Supported PCB Revision | Authors | Description | ||||||||||||||||||||||
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| REV02REV03 | REV02 |
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| 2018-08-15 | v.3 | REV02 | REV02 | Antti Lukats |
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| All |
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