Rainbow Electronics W90N745CDG - Manual (Page 131)

W90N745CD/W90N745CDG
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FIFO Threshold Control Register (FFTCR)
The FFTCR defines the high and low threshold of internal FIFOs, including TxFIFO and RxFIFO. The
threshold of internal FIFOs is related to EMC request generation and when the frame transmission
starts. The FFTCR also defines the burst length of AHB bus cycle for system memory access.
REGISTER ADDRESS R/W DESCRIPTION RESET VALUE
FFTCR 0xFFF0_309C R/W FIFO Threshold Control Register 0x0000_0101
31 30 29 28 27 26 25 24
Reserved
23 22 21 20 19 18 17 16
Reserved BLength Reserved
15 14 13 12 11 10 9 8
Reserved TxTHD
7 6 5 4 3 2 1 0
Reserved RxTHD
BITS DESCRIPTIONS
[31:22] Reserved -
[21:20] Blength
The DMA Burst Length defines the burst length of AHB bus cycle
while EMC accesses system memory.
2’b00: 4 words
2’b01: 8 words
2’b10: 16 words
2’b11: 16 words
[19:10] Reserved -