Ls1028A Configuration; Rcw Source; Configuration Signals - TQ-Systems TQMLS1028A User Manual

4.3

LS1028A Configuration

4.3.1

RCW Source

The RCW source of the TQMLS1028A is determined by the level of the analogue 3.3 V signal RCW_SRC_SEL.
The RCW source selection is managed by the system controller. A 10 kΩ Pull-Up to 3.3 V is assembled on the TQMLS1028A.
Table 5: Signal RCW_SRC_SEL
RCW_SRC_SEL (3.3 V)
3.3 V (80 % to 100 %)
2.33 V (60 % to 80 %)
1.65 V (40 % to 60 %)
1.05 V (20 % to 40 %)
0 V (0 % to 20 %)
4.3.2

Configuration signals

The LS1028A CPU is configured via pins as well as via registers.
Table 6: Reset Configuration Signals
Reset cfg. name
cfg_rcw_src[0:3] ASLEEP, CLK_OUT, UART1_SOUT, UART2_SOUT
cfg_svr_src[0:1] XSPI1_A_CS0_B, XSPI1_A_CS1_B
cfg_dram_type EMI1_MDC
cfg_eng_use0 XSPI1_A_SCK
cfg_gpinput[0:3] SDHC1_DAT[0:3], I/O voltage 1.8 or 3.3 V
cfg_gpinput[4:7] XSPI1_B_DATA[0:3]
The following table shows the coding of the field cfg_rcw_src:
Table 7: Reset Configuration Source
cfg_rcw_src[3:0]
0xxx
1000
1001
1010
1011
1100
1101
1110
1111
Green Standard configuration
Yellow Configuration for development and debugging
1: Yes  via shift register; No  fixed value.
2: Device address 0x50 / 101 0000b = Configuration EEPROM.
User's Manual l TQMLS1028A UM 0101 l © 2020, TQ-Systems GmbH
Reset Configuration Source
SD card, on carrier board
eMMC, on TQMLS1028A
SPI NOR flash, on TQMLS1028A
Hard Coded RCW, on TQMLS1028A
C EEPROM on TQMLS1028A, address 0x50 / 101 0000b
I
2
Functional signal name
Hard-coded RCW (TBD)
SDHC1 (SD card)
SDHC2 (eMMC)
I2C1 extended addressing
(Reserved)
XSPI1A NAND 2 KB pages
XSPI1A NAND 4 KB pages
(Reserved)
XSPI1A NOR
Default On TQMLS1028A
1111
Several
11
11
1
0 = DDR4
1
1
1111
Not driven, internal PUs
1111
Not driven, internal PUs
RCW source
2
Page 11
PD on carrier board
None (open)
24 kΩ PD
10 kΩ PD
4.3 kΩ PD
0 Ω PD
1
Variable
Yes
No
No
No
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