Fifo Status Registers; Read Control Registers - Analog Devices ADuCM356 Reference Manual

Reference Manual
REGISTER DETAILS: SPI0/SPI1
Table 313. Bit Descriptions for SPI0_DMA, SPI1_DMA (Continued)
Bits Bit Name Settings
0 EN

FIFO STATUS REGISTERS

Address: 0x40004020, Reset: 0x0000, Name: SPI0_FIFO_STAT
Address: 0x40024020, Reset: 0x0000, Name: SPI1_FIFO_STAT
Table 314. Bit Descriptions for SPI0_FIFO_STAT, SPI1_FIFO_STAT
Bits Bit Name Settings
[15:12] Reserved
[11:8] RX
[7:4] Reserved
[3:0] TX

READ CONTROL REGISTERS

Address: 0x40004024, Reset: 0x0000, Name: SPI0_RD_CTL
Address: 0x40024024, Reset: 0x0000, Name: SPI1_RD_CTL
This register is only used in initiator mode.
Table 315. Bit Descriptions for SPI0_RD_CTL, SPI1_RD_CTL
Bits Bit Name Settings
[15:9] Reserved
8 THREEPIN
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Description
0 Disable transmit DMA interrupt.
1 Enable transmit DMA interrupt.
Enable DMA for Data Transfer. Set by user code to start a DMA transfer. Cleared by user code at the
end of DMA transfer. This bit must be cleared to prevent extra DMA requests to the µDMA controller.
Description
Reserved.
SPI Receive FIFO Status. This field specifies the number of bytes in the receive FIFO when the DMA is
disabled. In DMA mode, these bits refer to the number of half words in the receive FIFO.
0000 Receive FIFO empty.
0001 1 valid byte or half word in the receive FIFO.
0010 2 valid bytes or half words in the receive FIFO.
0011 3 valid bytes or half words in the receive FIFO.
0100 4 valid bytes or half words in the receive FIFO.
0101 5 valid bytes or half words in the receive FIFO.
0110 6 valid bytes or half words in the receive FIFO.
0111 7 valid bytes or half words in the receive FIFO.
1000 8 valid bytes or half words in the receive FIFO. Receive FIFO full.
Reserved.
SPI Transmit FIFO Status. This field specifies the number of bytes in the transmit FIFO when DMA is
disabled. In DMA mode, these bits refer to the number of half words in the transmit FIFO.
0000 Transmit FIFO empty.
0001 1 valid byte or half word in the transmit FIFO.
0010 2 valid bytes or half words in the transmit FIFO.
0011 3 valid bytes or half words in the transmit FIFO.
0100 4 valid bytes or half words in the transmit FIFO.
0101 5 valid bytes or half words in the transmit FIFO.
0110 6 valid bytes or half words in the transmit FIFO.
0111 7 valid bytes or half words in the transmit FIFO.
1000 8 valid bytes or half words in the transmit FIFO. Transmit FIFO full.
Description
Reserved.
3-Pin SPI Mode. This field specifies if the SPI interface has a bidirectional data pin (3‑pin interface) or
dedicated unidirectional data pins for transmit and receive (4-pin interface). This bit is only valid in read
command mode and when SPIx_FLOW_CTL, Bits[1:0] = 0b01. If 3-pin mode is selected, the MOSI pin
ADuCM356
Reset Access
0x0 R/W
Reset Access
0x0 R
0x0 R
0x0 R
0x0 R
Reset Access
0x0 R
0x0 R/W
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