User's Manual l TQMa6x & TQMa6xP UM 0403 l © 2019, TQ-Systems GmbH
Page 19
ENET (continued)
Attention: Max. load on VCC2V5_RGMII_OUT
In order to spare an additional I/O voltage power supply on the carrier board, the voltage
VCC2V5_RGMII_OUT provided by the TQMa6x can be used as I/O supply voltage for an RGMII-PHY.
VCC2V5_RGMII_OUT provides a maximum of 200 mA, of which the TQMa6x requires approximately
80 mA.
Attention: Special function of TQMa6x pin X1–150
The pad GPIO_16 / ball R2 / signal GPIO7_IO11 of the i.MX6 (TQMa6x pin X1–150) has a special
function with different Ethernet functions. More information is to be taken from the NXP Hardware
Development Guide for i.MX 6Quad, 6Dual, 6DualLite, 6Solo Families of Applications Processors (9).
Note: NXP erratum ERR006687, reduced ENET performance
On account of the NXP erratum ERR006687, which describes reduced ENET performance when
responding to interrupts, new variants were introduced with TQMa6x revision 04xx.
The workaround provided by NXP is implemented on variants “A” and “C” of TQMa6x revision 04xx.
Please note, that the Letters “A”, “B”, and “C” must not be confused with the letters in the order code
of the e.g., TQMa6Q-AA. Please contact
for more information regarding the desired
variant.
The following table shows the three possible variants.
Table 24:
ENET-Patch variants
Variant
Short description
Remark
A
2 × I2C1 + ENET-Patch
For Solo, DualLite, Dual, and Quad CPUs, designed to work on MBa6x
B
1 × I2C1 + 1 × I2C3
For DualPlus and QuadPlus, fully backward compatible to TQMa6x revision 01xx
C
1 × I2C1 + ENET-Patch + 1 × GPIO
Provides an additional GPIO compared to Variant “A”, not designed to work on MBa6x
Illustration 9, Illustration 10, and Illustration 11 show the different variants, see also 3.2.5.9.
