W90N745CD Datasheet, PDF (131/422 Pages) Winbond – 16/32-bit ARM microcontroller

W90N745CD/W90N745CDG
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
FFTCR 0xFFF0_309C
R/W
R/W
DESCRIPTION
FIFO Threshold Control Register
RESET VALUE
0x0000_0101
31
30
23
22
Reserved
15
14
7
6
29
28
27
Reserved
21
20
19
BLength
13
12
11
Reserved
5
4
3
Reserved
26
25
24
18
17
Reserved
10
9
2
1
16
8
TxTHD
0
RxTHD
BITS
[31:22]
[21:20]
[19:10]
Reserved
Blength
Reserved
DESCRIPTIONS
-
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
-
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