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LS1028A
Mux
Mux
Mux
Mux
S AI4_TXD
S AI4_TS YNC
S AI4_TXBCLK
RGMII
(OVDD)
EC1_RXD2
I2C1
ECx_TXD2
ECx_GTX_CLK
Addr = 0x77
PCA9848PWJ
1.8V
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
I2C1_CH1
1.8V
SGTL5000
Audio
Transceiver
(Used only on TX)
I2S_DIN
I2S_LRCLK
I2S_SCLK
I2C1_CH1
Audio LINEOUT
(for stereo speakers)
LINEOUT_L/
LINEOUT_R
CTRL_DATA/CLK
CTRL_ADR0_CS
CTRL_MODE
MUXSEL_SAI_EN
(From CPLD)
25MHz
XO
I2S_MCLK
The SGTL5000 has 25 MHz as MCLK input to generate the required SAI and internal clocks. The device can provide or take as
input the TSYNC based on desired configuration.
The SAI4 signals are multiplexed with the IEEE signals (see
on page 28) and LS1028ARDB uses the multiplexer
74LVC2G3157DPJ (U92, from Nexperia) to demux. Software must configure the appropriate signal through FPGA, to select the
appropriate controller and interface.
Table 12. SAI4 configuration and setup
Configuration signal
Controlled by
Description
MUXSEL_SAI_EN
BRDCFG3[2]
• 0: IEEE signals connect to the IEEE
header
• 1: IEEE signals connect to the SAI4
CODEC
2.10 M.2 connectors
The LS1028ARDB supports M.2 connectors (Key E and Key B) that are supported through SerDes lanes 2 and 3.
One M.2 Key E connector (J16) is connected through the LYNX36 SerDes lane 2. This connector supports only 1630 and 2230
PCIe Gen3 card types to provide wireless connectivity including Wi-Fi, Bluetooth, and NFC.
The other M.2 Key E connector (J18) is connected through the LYNX36 SerDes lane 3. However, lane 3 can also connect to the
M.2 Key B connector (J20) as per the register settings mentioned in
Table 13. Register configuration
on page 31 to support solid
state storage devices (SSD) ( SATA 3.0). The M.2 Key B connector supports 2230 and 2242 module card types.
The following table describes the three-pad arrangement that is required to select either Type E connector or Type B connector
on the LYNX36 SerDes lane 3.
Table 13. Register configuration
M.2 connector select
Signal name
Mount register/capacitor
Values
PEXM2_2_REFCLK_P
R214
0 Ω
Table continues on the next page...
M.2 connectors
QorIQ LS1028A Reference Design Board Reference Manual, Rev. b, 11/2018
NXP Semiconductors
COMPANY CONFIDENTIAL
31
Содержание QorIQ LS1028A
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