Vcc_Io Usage - Enclustra Mercury SA1 SoC Module User Manual

2.9.5

VCC_IO Usage

The VCC_IO voltages for the I/O banks located on the module connector are configurable by applying the
required voltage to the VCC_IO_B[x] or VCC_CFG_[x] pins. All VCC_IO_B[x] or VCC_CFG_[x] pins of the same
bank must be connected to the same voltage.
For compatibility with other Enclustra Mercury modules, it is recommended to use a single I/O voltage per
module connector.
Signal Name
VCC_CFG_HPS_B3A_B8A
VCC_IO_B3B_B4A
VCC_IO_B5A_B5B
Table 8: VCC_IO Pins
Note that the VCCPD (I/O pre-driver power supply) for each bank is set automatically to 2.5 V (if the corre-
sponding VCCIO is less than or equal to 2.5 V) or to VCCIO (if the corresponding VCCIO is higher or equal
to 3.0 V).
Warning!
Use only VCC_IO voltages compliant with the equipped SoC device; any other voltages may damage
the equipped SoC device, as well as other devices on the Mercury SA1 SoC module.
Do not leave a VCC_IO pin floating, as this may damage the equipped SoC device, as well as other
devices on the Mercury SA1 SoC module.
Warning!
Do not power the VCC_IO pins when PWR_GOOD and PWR_EN signals are not active. If the module
is not powered, you need to make sure that the VCC_IO voltages are disabled (for example, by using a
switch on the base board, which uses PWR_GOOD as enable signal). Figure 10 illustrates the VCC_IO
power requirements.
1
For eMMC flash support VCC_CFG_HPS_B3A_B8A must be either 1.8 V or 3.3 V. The eMMC flash is equipped starting with revision
3 modules.
D-0000-402-002
SoC Pins Supported Voltages
VCCIO3A, 1.8 V, 2.5 V - 3.3 V
VCCIO8A,
VCCIO7A-D
VCCIO3B, 1.2 V - 3.3 V
VCCIO4A
VCCIO5A, 1.2 V - 3.3 V
VCCIO5B
20 / 49
Connector A
Pins
1
5% 74, 77
5% -
5% 38, 41
Connector B
Pins
-
64, 67, 88, 95,
140, 143
-
Version 06, 16.02.2021